Usefuldevtools
A comprehensive collection of free online developer tools and utilities. Boost your productivity with our powerful, easy-to-use tools designed for developers, by developers.
Text Tools
28 tools (19 direct + 9 in 1 subcategory)
Comma Separator
Convert text lines to comma-separated values with advanced formatting options. Includes sorting, deduplication, custom delimiters, and export functionality.
Split Text
Split text into chunks using delimiters, regex patterns, fixed width, or specified number of parts. Includes file import and multiple export formats.
Join Text
Merge multiple text segments into a single string using custom connectors. Includes smart processing options like whitespace trimming and duplicate removal.
Repeat Text
Duplicate text multiple times with customizable separators. Supports decimal repetitions for partial text duplication and various output formats.
Reverse Text
Reverse text character by character or line by line. Create backwards text, mirror text, and flip content with instant preview and export options.
Change Case
Transform text case with multiple options: lowercase, UPPERCASE, Title Case, Sentence case, random case, alternating patterns, and inverse case. Includes live preview and export functionality.
Sort Text
Sort lines of text alphabetically in ascending or descending order with case-sensitive options, natural number sorting, and duplicate removal.
Find & Replace
Advanced text search and replace with regex support, case sensitivity, whole word matching, and batch operations for complex text processing.
Reverse List
Reverse the order of lines in a list or text. Perfect for inverting sorted data, reversing chronological order, or flipping any line-based content.
Text Diff
Compare two texts and highlight differences line by line. Perfect for code comparison, document review, and change detection with side-by-side or unified diff views.
Word Count
Count words, characters, sentences, and paragraphs in your text. Get detailed statistics including reading time, average word length, and keyword frequency.
Replace Text
Find and replace text with exact match (no regex). Simple, fast text replacement with case-sensitive toggle, live preview, and export functionality.
Remove Duplicates
Advanced duplicate removal tool for words and lines. Remove duplicate words within lines or across text, duplicate lines, with case-sensitivity, whitespace handling, and display removed items.
Word Duplicator
Advanced word duplication tool with intelligent selection, case handling, scope controls, and custom separators. Duplicate all words or target specific words with powerful filtering options.
Justify Text
Advanced text justification tool with fixed-width and auto-width modes, word breaking options, paragraph-aware processing, and last line control. Professional text formatting with live preview.
Indent Text
Advanced text indentation tool with character count and level-based modes, custom indent types, scope options, unindent features, and normalization. Professional formatting with live preview.
Text Metrics
Comprehensive text analysis tool with line, character, and word counting, unique word analysis, custom filters, alphabetic breakdowns, and live visual charts. Advanced metrics with instant updates.
Character Counter
Streamlined character counting tool with specialized modes for characters, words, lines, paragraphs, sentences, and combined metrics. Real-time counting with inclusion/exclusion filters and live progress tracking.
Reading Time Calculator
Advanced reading time estimation tool with customizable reading speeds, comprehension levels, content difficulty analysis, and presentation timing. Perfect for writers, speakers, and content creators.
Random Generators
9 tools available
Random Email Generator
Generate realistic random email addresses for testing, development, and mockups. Create single emails or bulk lists with customizable domains and formats.
Strong Password Generator
Generate cryptographically secure passwords with customizable length, character sets, and strength requirements. Perfect for accounts, applications, and security testing.
Random Number Generator
Generate random numbers with customizable ranges, types, and quantities. Perfect for games, statistics, research, and decision making.
Random Name Generator
Generate random names from multiple origins including English and fantasy styles. Perfect for character creation, writing, testing, and creative projects.
Random Word Generator
Generate random words from multiple categories including nouns, verbs, adjectives, animals, colors, and technology terms. Perfect for creative writing and brainstorming.
Lorem Ipsum Generator
Generate classic Lorem Ipsum placeholder text for designs, websites, and documents. Choose paragraphs, sentences, or words with customizable formatting.
Random Joke Generator
Generate clean, family-friendly jokes from multiple categories including dad jokes, one-liners, puns, knock-knock jokes, and more. Perfect for entertainment, presentations, and social situations.
Random Travel Destination Generator
Discover spontaneous travel destinations based on your location, transport preferences, and trip type. Perfect for last-minute adventures and impromptu getaways with distance filtering.
Random Quote Generator
Get inspired with random motivational quotes from great minds throughout history. Perfect for daily motivation, social media posts, presentations, and personal reflection.
Calculators
72 tools in 5 subcategories
Financial Calculators
27 tools available
VAT Calculator
Advanced VAT/GST calculator with rates for 170+ countries, custom rates, reverse calculation, multiple items support, and comprehensive tax breakdown. Perfect for businesses and international commerce.
US Sales Tax Calculator
Advanced US sales tax calculator with rates for all 50 states, local taxes, special districts, nexus rules, and exemptions. Calculate taxes for multiple items, e-commerce, and interstate sales.
Mortgage Calculator
Advanced mortgage calculator with detailed amortization schedules, extra payment analysis, PMI calculations, tax benefits, and comprehensive loan analysis. Perfect for home buyers and refinancing decisions.
Loan Calculator
Advanced loan calculator for personal, auto, business, and student loans with amortization schedules, extra payments, and comprehensive analysis. Compare loan types and optimize payment strategies.
Student Loan Calculator
Specialized education loan calculator with federal/private loan analysis, income-driven repayment plans, loan forgiveness scenarios, and student debt optimization strategies.
Personal Loan Calculator
Unsecured loan calculator with debt consolidation analysis, credit score impact modeling, rate comparisons, and personal financing optimization tools.
Auto Loan Calculator
Vehicle financing calculator with new/used car analysis, trade-in value modeling, dealer vs bank financing comparisons, and auto loan optimization.
Business Loan Calculator
Commercial financing calculator with SBA loan modeling, equipment financing analysis, working capital planning, and business debt strategies.
Interest Calculator
Advanced interest calculator for simple and compound interest with inflation adjustments, tax calculations, periodic contributions, and comprehensive investment analysis. Calculate savings growth, investment returns, and compare different compounding frequencies.
Debt Ratio Calculator
Calculate your debt-to-income ratio with detailed breakdown by debt categories. Features front-end/back-end ratios, visual indicators, recommendations, and export functionality.
Salary Calculator
Professional salary calculator with tax calculations, benefits analysis, overtime pay, bonuses, deductions, and comprehensive compensation breakdown. Calculate take-home pay, hourly rates, and annual salary conversions with detailed payroll analysis.
Inflation Calculator
Professional inflation calculator with historical inflation rates, purchasing power analysis, cost of living adjustments, and comprehensive economic impact assessment. Calculate real value, inflation-adjusted returns, and future cost projections with detailed analysis.
Currency Calculator
Professional currency converter with real-time exchange rates, historical data, currency trends, and comprehensive foreign exchange analysis. Convert between 170+ world currencies with live rates, cross-rate calculations, and detailed market insights.
Amortization Calculator
Professional amortization calculator with detailed payment schedules, extra payment analysis, refinancing scenarios, and comprehensive loan amortization tables. Calculate monthly payments, total interest, and optimize loan payoff strategies with advanced features.
Rent vs Buy Calculator
Professional rent vs buy calculator with comprehensive analysis, total cost of ownership, opportunity cost analysis, and detailed financial projections. Compare renting vs buying with tax benefits, appreciation, maintenance costs, and investment alternatives.
Lease Calculator
Professional vehicle lease calculator with comprehensive cost analysis, lease vs buy comparison, residual value calculations, and detailed payment breakdowns. Calculate monthly payments, total lease costs, and analyze lease deals with money factor, capitalized cost, and trade-in analysis.
APR Calculator
Calculate the true Annual Percentage Rate (APR) including all fees and costs. Features multiple calculation methods, fee analysis, payment schedules with charts, and comparison tools.
GPA Calculator
Advanced GPA calculator with cumulative GPA tracking, semester management, grade planning, and comprehensive academic performance analysis for students. Calculate GPA with multiple grading scales, prior GPA integration, and target GPA planning.
401k Calculator
Professional 401k retirement calculator with comprehensive analysis, employer matching, contribution limits, tax benefits, and detailed retirement projections. Calculate retirement savings, optimize contributions, and plan for financial independence with advanced 401k planning tools.
Marriage Tax Calculator
Professional marriage tax calculator analyzing tax implications, cost savings, living expenses, and financial benefits of marriage vs staying single. Compare married vs single filing status, shared expenses, healthcare costs, and comprehensive financial planning for couples.
Credit Card Calculator
Professional credit card payoff calculator with multiple card management, debt avalanche vs snowball strategies, balance transfer analysis, and comprehensive payment planning. Calculate payoff times, interest savings, and optimize your credit card debt elimination strategy.
Retirement Calculator
Professional retirement planning calculator with comprehensive analysis including 401k, IRA, Social Security optimization, withdrawal strategies, and inflation-adjusted projections. Plan your retirement savings, calculate required monthly contributions, and analyze multiple retirement scenarios.
Social Security Calculator
Professional Social Security benefits calculator with comprehensive analysis including optimal claiming strategies, spousal benefits, survivor benefits, and lifetime value optimization. Calculate your estimated benefits, compare claiming ages, and maximize your Social Security income.
IRA Calculator
Professional IRA calculator with Traditional vs Roth IRA comparison, contribution limits analysis, tax benefits optimization, and required minimum distribution planning. Calculate IRA growth, compare tax strategies, and maximize your retirement savings with detailed projections.
Estate Tax Calculator
Professional estate tax calculator with federal and state tax analysis, 2025 exemptions, gift tax integration, and wealth transfer optimization. Calculate estate taxes, explore tax-saving strategies, and plan efficient inheritance with advanced estate planning tools.
RMD Calculator
Professional Required Minimum Distribution calculator with comprehensive analysis including IRS life expectancy tables, multiple account management, tax planning strategies, and penalty avoidance. Calculate RMDs for Traditional IRAs, 401(k)s, and inherited accounts with detailed projections and optimization strategies.
Tax Return Calculator
Advanced federal and state tax return calculator with 2024 tax brackets, deductions, credits, filing status optimization, and comprehensive tax planning analysis. Calculate tax liability, refunds, effective tax rates, and optimize your tax strategy with professional-grade tools.
Business Calculators
35 tools available
ROAS Calculator
Professional Return on Ad Spend calculator with advanced metrics analysis, industry benchmarks, campaign comparison, and profit optimization. Calculate ROAS for Google Ads, Facebook Ads, and all digital marketing channels with comprehensive performance insights.
YouTube Revenue Calculator
Professional YouTube revenue calculator with advanced CPM/RPM analysis, niche-specific calculations, geographic targeting, and comprehensive earning projections. Calculate potential YouTube earnings with industry-leading accuracy.
Website Valuation Tool
Professional website valuation calculator using proven marketplace methodologies. Calculate your website's worth with multiple factors including business model, revenue, growth, and risk assessment. Get accurate estimates based on Empire Flippers and Flippa data.
Employee Turnover Calculator
Professional employee turnover rate calculator with industry benchmarks, cost analysis, and comprehensive HR metrics. Calculate voluntary, involuntary, and overall turnover rates with detailed insights and performance comparisons.
Website Ad Revenue Calculator
Professional website ad revenue calculator with advanced CPM/CPC analysis, ad network comparison, geographic targeting, and comprehensive earning projections. Calculate potential website ad earnings with industry-leading accuracy.
Tenure Calculator
Professional tenure calculator for employees, real estate, academic positions, and business relationships. Calculate work tenure, employment duration, property ownership periods, and academic career progression with comprehensive analysis.
Time Value of Money Calculator
Advanced time value of money calculator with present value, future value, annuities, inflation analysis, and investment scenario modeling. Professional TVM calculator with comprehensive financial analysis and interactive visualizations.
Year-over-Year Growth Calculator
Advanced year-over-year growth calculator with multi-metric analysis, trend visualization, industry benchmarking, and comprehensive growth rate calculations. Professional YoY growth analysis with forecasting and comparative insights.
Sales Commission Calculator
Professional sales commission calculator with tiered structures, team splits, bonus programs, and draw management. Calculate simple commissions, progressive rates, team performance, and multi-period analysis with comprehensive compensation planning tools.
SaaS Metrics Calculator
Comprehensive SaaS KPI dashboard with health scoring, unit economics analysis, churn metrics, and growth tracking. Calculate MRR, ARR, LTV/CAC, retention rates, and 20+ key performance indicators with industry benchmarks for data-driven decisions.
Price Quantity Calculator
Advanced price-quantity calculator with demand analysis, price elasticity modeling, revenue optimization, and competitive positioning. Professional pricing strategy tool with break-even analysis, scenario planning, and market analysis.
PVGO Calculator
Professional Present Value of Growth Opportunities calculator with advanced valuation models, growth analysis, and investment evaluation. Features Gordon Growth Model, Two-Stage Model, CAPM integration, and comprehensive risk assessment.
Pre/Post Money Valuation Calculator
Advanced pre and post-money valuation calculator with equity dilution analysis, liquidation waterfall modeling, cap table calculations, and comprehensive investment terms analysis for startup funding and equity evaluation.
Payback Period Calculator
Professional payback period calculator with NPV analysis, IRR calculations, discounted payback, risk assessment, and comprehensive investment evaluation. Advanced capital budgeting tool with scenario analysis and decision framework.
Investment Return Calculator
Advanced investment return calculator with performance analysis, risk-adjusted metrics, benchmark comparison, Sharpe ratio calculation, Alpha/Beta analysis, and comprehensive portfolio evaluation with professional grading system.
3D Printer Buy vs Outsource Calculator
Advanced manufacturing decision calculator with total cost of ownership analysis, ROI calculations, strategic factor assessment, printer type database, and comprehensive investment evaluation. Calculate break-even points, operational costs, and make informed manufacturing decisions.
Absence Percentage Calculator
Comprehensive workforce analytics calculator with absence rate analysis, cost impact assessment, department comparison, intervention ROI, and benchmarking tools. Professional HR dashboard with risk levels and strategic recommendations for workforce management.
Accumulated Depreciation Calculator
Professional asset depreciation calculator with multiple methods including straight-line, declining balance, MACRS, sum-of-years, and units of production. Features tax optimization with Section 179 and bonus depreciation for comprehensive asset management.
AFN Calculator (Additional Funds Needed)
Advanced financial forecasting calculator with comprehensive growth analysis, funding optimization, scenario planning, and strategic financial management. Calculate external financing requirements with multiple methods and detailed projections.
Average Collection Period Calculator
Professional receivables management calculator with cash flow analysis, aging schedule optimization, credit policy evaluation, and comprehensive collection strategies. Advanced tool for credit managers and financial analysts.
Bounce Rate Calculator
Calculate website bounce rate and analyze visitor engagement metrics. Measure single-page sessions vs total sessions with industry benchmarks, performance analysis, and actionable recommendations for website optimization.
Online Marketing ROI Calculator
Calculate return on investment for digital marketing campaigns. Analyze campaign profitability, optimize advertising spend, and measure marketing efficiency with comprehensive ROI analysis and performance insights.
Business Budget Calculator
Plan and manage business budgets with detailed income and expense tracking. Create comprehensive financial plans, analyze profitability, and project cash flow with dynamic budget management and export capabilities.
Build or Buy Calculator
Compare costs and benefits of building in-house versus buying solutions. Make informed business decisions with NPV analysis, time-to-value assessment, and comprehensive make-or-buy analysis.
COGS Calculator
Calculate Cost of Goods Sold and analyze gross profit margins. Use inventory formula or detailed breakdown methods to assess business profitability, optimize pricing, and manage inventory costs.
CPA Calculator
Calculate Cost Per Acquisition with advanced channel comparison, LTV analysis, and customer acquisition optimization strategies. Professional marketing analytics with performance insights and ROI calculations.
CPC & CPM Calculator
Calculate Cost Per Click and Cost Per Mille with advanced bidding strategies, cross-platform comparison, and performance optimization insights for maximum advertising efficiency.
CTR Calculator
Calculate Click-Through Rate with advanced analytics, A/B testing insights, and conversion optimization strategies for maximum engagement and campaign performance.
CAC Calculator
Calculate Customer Acquisition Cost with comprehensive LTV analysis, payback period calculations, and marketing channel optimization strategies for sustainable business growth.
Customer Retention Rate Calculator
Calculate customer retention rates with comprehensive cohort analysis, churn predictions, lifetime value impact, and retention optimization strategies for sustainable business growth.
Direct Material Price Variance Calculator
Calculate direct material price variance with comprehensive cost analysis, supplier performance metrics, procurement optimization strategies, and advanced variance reporting for manufacturing cost control.
Earned Value Management Calculator
Calculate EVM metrics with comprehensive project analytics, performance forecasting, schedule variance analysis, and advanced project management insights for optimal project control and delivery.
Effective Corporate Tax Rate Calculator
Calculate effective corporate tax rate with comprehensive tax optimization, multi-jurisdiction analysis, deduction planning strategies, and advanced tax efficiency metrics for optimal tax management.
EMV (Expected Monetary Value) Calculator
Calculate Expected Monetary Value with comprehensive risk analysis, decision tree modeling, portfolio optimization, and advanced probability assessment for strategic decision-making and risk management.
Exit Rate Calculator
Calculate website exit rates with comprehensive user behavior analysis, conversion optimization insights, funnel analytics, and advanced web performance metrics for data-driven digital marketing decisions.
Biology & Science Calculators
51 tools available
Molecular Biology & Genetics
5 tools available
Hardy-Weinberg Equilibrium Calculator
Calculate allele and genotype frequencies in populations using Hardy-Weinberg equilibrium principles. Essential for population genetics, evolution studies, and conservation biology research.
DNA Molecular Weight Calculator
Calculate molecular weight of DNA sequences with support for single and double-stranded DNA. Essential tool for molecular biology, PCR applications, and laboratory quantification.
Protein Molecular Weight Calculator
Calculate protein molecular weight and extinction coefficient from amino acid sequences. Essential for protein purification, SDS-PAGE analysis, and biochemical applications.
PCR Primer Calculator
Calculate PCR primer melting temperature, GC content, and design parameters for optimal amplification. Essential tool for molecular biology and PCR optimization.
Population Growth Rate Calculator
Calculate exponential and logistic population growth rates with doubling time analysis. Essential for microbiology, ecology studies, and population modeling.
Bio Laboratory Calculators
9 tools available
Annealing Temperature Calculator
Calculate optimal annealing temperature for PCR primers with melting temperature analysis and primer optimization. Essential tool for PCR optimization and molecular biology applications.
Generation Time Calculator
Calculate bacterial and cell generation time with doubling time analysis for microbiology and cell culture. Essential for fermentation, cell biology, and growth kinetics research.
Cell Dilution Calculator
Calculate cell dilutions for cell culture, microscopy, and laboratory applications with concentration analysis. Essential tool for cell biology and laboratory research.
Cell Doubling Time Calculator
Calculate cell doubling time and growth rate for cell culture and proliferation studies. Essential for cell biology, cancer research, and drug testing applications.
DNA Concentration Calculator
Calculate DNA concentration using absorbance measurements and spectrophotometry analysis. Essential tool for molecular biology, PCR preparation, and laboratory quantification.
DNA Ligation Calculator
Calculate DNA ligation ratios and concentrations for molecular cloning and vector construction. Essential tool for genetic engineering and plasmid preparation.
Log Reduction Calculator
Calculate log reduction values for antimicrobial efficacy and sterilization validation. Essential for microbiology, quality control, and disinfection studies.
Laboratory Dilution Calculator
Calculate solution dilutions for laboratory preparations with molarity and concentration conversions. Essential tool for analytical chemistry and biochemical assays.
Protein Concentration Calculator
Calculate protein concentration using Bradford, BCA, and spectrophotometry methods. Essential for protein analysis, biochemistry research, and protein purification.
Animal Pregnancy Calculators
10 tools available
Cat Pregnancy Calculator
Calculate cat gestation period and pregnancy timeline. Track important milestones and prepare for kitten birth with accurate feline pregnancy calculations.
Cow Gestation Calculator
Calculate cattle gestation period and breeding schedules. Essential tool for dairy and beef farmers to track bovine pregnancy and plan for calving.
Dog Pregnancy Calculator
Calculate dog gestation period and pregnancy stages. Track canine pregnancy milestones and prepare for puppy birth with accurate timing.
Goat Gestation Calculator
Calculate goat pregnancy timeline and kidding schedule. Essential tool for goat breeders to track caprine gestation and plan for birth.
Guinea Pig Pregnancy Calculator
Calculate guinea pig gestation period and pregnancy stages. Track cavy pregnancy timeline and prepare for pup birth with accurate calculations.
Mare Gestation Calculator - Horse Gestation
Calculate horse and mare gestation period for equine breeding. Track pregnancy timeline and foaling schedule with professional accuracy.
Llama Gestation Calculator
Calculate llama pregnancy timeline and birth schedule. Essential tool for camelid breeders to track gestation and plan for cria birth.
Rabbit Gestation Calculator
Calculate rabbit pregnancy period and kindling schedule. Track lagomorph gestation timeline and prepare for kit birth with accurate timing.
Sheep Gestation Calculator
Calculate sheep pregnancy timeline and lambing schedule. Essential tool for shepherds and sheep farmers to track ovine gestation periods.
Swine Gestation Calculator
Calculate pig pregnancy timeline and farrowing schedule. Essential tool for pig farmers to track swine gestation and plan for piglet birth.
Dog Calculators
21 tools available
Benadryl Dosage Calculator for Dogs
Calculate safe Benadryl dosage for dogs based on weight and condition. Veterinary-approved antihistamine dosing for canine allergies and reactions.
Cephalexin For Dogs Dosage Calculator
Calculate proper Cephalexin antibiotic dosage for dogs. Veterinary dosing calculator for bacterial infections in canines.
Cost of Owning a Dog Calculator
Calculate the total lifetime cost of dog ownership including food, veterinary care, grooming, and supplies. Budget planning for pet expenses.
Dog Age Calculator
Convert dog age to human years using modern veterinary calculations. Accurate age conversion based on breed size and life stage.
Dog BMI Calculator
Calculate your dog's Body Mass Index and assess body condition score. Canine weight management and obesity prevention tool.
Dog Nutrition Calculator
Calculate daily nutritional requirements for dogs including calories, protein, and nutrients. Customized feeding recommendations by age and activity.
Dog Chocolate Toxicity Calculator
Calculate chocolate toxicity risk for dogs based on type and amount consumed. Emergency assessment tool for theobromine poisoning.
Dog Crate Size Calculator
Calculate the ideal crate size for your dog based on measurements and growth predictions. Proper crate sizing for training and comfort.
Dog Food Calculator
Calculate daily dog food portions and feeding amounts. Customized feeding recommendations based on weight, age, and activity level.
Dog Harness Size Calculator
Calculate the correct harness size for your dog using chest and neck measurements. Proper fitting guide for comfortable and secure harnesses.
Dog Heat Cycle Calculator
Track and predict dog heat cycles and estrus timing. Essential tool for breeding planning and reproductive health monitoring.
Dog Life Expectancy Calculator
Calculate dog life expectancy based on breed, size, and health factors. Longevity predictions and senior care planning.
Metacam Dosage Calculator for Dogs
Calculate safe Metacam (meloxicam) dosage for dogs. Veterinary NSAID dosing for canine pain and inflammation management.
Dog Onion Toxicity Calculator
Calculate onion toxicity risk for dogs based on amount consumed. Emergency assessment tool for allium poisoning in canines.
Dog Quality of Life Calculator
Assess dog quality of life using veterinary scales. Objective evaluation tool for senior dogs and end-of-life decision making.
Dog Raisin Toxicity Calculator
Calculate raisin and grape toxicity risk for dogs. Emergency assessment tool for potentially fatal grape poisoning in canines.
Dog Size Calculator
Predict adult dog size based on puppy measurements and breed. Growth calculator for estimating final weight and dimensions.
Dog Water Intake Calculator
Calculate daily water requirements for dogs based on weight, activity, and environment. Hydration needs for optimal canine health.
Omega-3 For Dogs Calculator
Calculate optimal Omega-3 dosage for dogs. Fish oil and fatty acid supplementation for canine joint health and coat condition.
Raw Dog Food Calculator
Calculate raw food portions and nutritional balance for dogs. BARF diet calculator with meat, organ, and bone ratios.
Tramadol For Dogs Calculator
Calculate safe Tramadol dosage for dogs based on weight and condition. Veterinary pain medication dosing for canine pain management.
Cat Calculators
6 tools available
Cat Age Calculator
Convert cat years to human years with accurate aging calculations. How old is my cat in human years? Use the 15-9-4 rule for precise feline age conversion.
Cat Benadryl Dosage Calculator
Calculate safe Benadryl dosage for cats using the 1mg per pound rule. Diphenhydramine dosing calculator for feline allergies and reactions.
Cat BMI Calculator
Assess your cat's body condition score with our feline BMI calculator. Is my cat overweight? Use the 9-point body condition scoring system.
Cat Calorie Calculator
How many calories does my cat need daily? Calculate RER and MER requirements using 20-30 calories per pound for optimal feline nutrition.
Cat Chocolate Toxicity Calculator
Calculate chocolate toxicity risk for cats based on theobromine levels. Emergency assessment for feline chocolate poisoning and methylxanthine exposure.
Cat Pregnancy Calculator
Calculate cat gestation period and pregnancy stages. Track feline pregnancy milestones and prepare for kitten birth with accurate timing.
Construction Calculators
4 tools available
Material Estimators
4 tools available
Lumber Calculator
Professional lumber calculator with board feet calculations, framing requirements, cost analysis, and waste factors. Calculate lumber needs for construction projects with industry-standard formulas.
Roofing Calculator
Advanced roofing material calculator with shingle estimation, pitch factors, waste calculations, and comprehensive roofing cost analysis. Perfect for contractors and homeowners.
Flooring Calculator
Professional flooring calculator with area calculations, waste factors, material estimation, and cost analysis. Calculate flooring needs for any space with precision.
Concrete Calculator
Professional concrete calculator with volume calculations, mix ratios, cost analysis, and waste factors. Calculate concrete needs for slabs, footings, steps, and columns with precision.
Math & Geometry Calculators
16 tools available
Percentage Calculators
6 tools available
Percentage Calculator
Calculate percentages, percentage increase/decrease, and percentage of numbers with step-by-step solutions.
Discount Calculator
Calculate discounts, sale prices, and savings with multiple discount types and tax considerations.
Double Discount Calculator
Calculate the final price after applying two consecutive discounts with step-by-step breakdown.
Triple Discount Calculator
Calculate the final price after applying three consecutive discounts with detailed analysis.
Multiple Discount Calculator
Calculate up to 10 consecutive discounts with comprehensive breakdown and export options.
Markup Calculator
Calculate markup percentages, selling prices, and profit margins for retail and business pricing.
Concrete Calculator
Professional concrete calculator for volume estimation, material calculations, and cost analysis. Calculate concrete needed for slabs, footings, driveways, and foundations with mixing ratios, cost estimates, and comprehensive construction planning tools.
Area Calculator
Calculate areas of geometric shapes including rectangles, circles, triangles, parallelograms, trapezoids, ellipses, and sectors. Professional calculator with unit conversion, visual diagrams, and detailed formulas.
Pythagorean Theorem Calculator
Calculate missing sides of right triangles using the Pythagorean theorem (a² + b² = c²). Find hypotenuse, missing sides, or verify right triangles with step-by-step solutions, visual diagrams, and construction applications.
Volume Calculator
Calculate volumes of 3D shapes including cubes, spheres, cylinders, cones, pyramids, and prisms. Professional calculator with unit conversion, visual diagrams, and batch processing for construction, shipping, and engineering.
Perimeter Calculator
Calculate perimeters of 2D shapes including rectangles, circles, triangles, polygons, and irregular shapes. Professional calculator with unit conversion, visual diagrams, and batch processing for construction, fencing, and landscaping.
Triangle Calculator
Comprehensive triangle calculator for area, perimeter, angles, and sides. Calculate all triangle types including equilateral, isosceles, scalene, and right triangles with Law of Cosines, Law of Sines, visual diagrams, and professional construction applications.
Circle Calculator
Professional circle calculator for circumference, area, diameter, radius, arc length, and sector calculations. Calculate all circle properties with visual diagrams, unit conversion, and advanced geometric features for construction, engineering, and design applications.
Rectangle Calculator
Professional rectangle calculator for area, perimeter, diagonal, and dimension calculations. Calculate all rectangle properties with visual diagrams, unit conversion, and advanced features for construction, design, and engineering applications.
Cubic Equation Calculator
Advanced cubic equation solver with real-time visualization, step-by-step solutions, and interactive graphing. Solve ax³ + bx² + cx + d = 0 with multiple solution methods, smooth animations, and comprehensive mathematical analysis.
Scientific Calculator
Advanced scientific calculator with graphing capabilities, function plotting, step-by-step solutions, and comprehensive mathematical operations. Features trigonometry, logarithms, statistics, and real-time function visualization.
Converters
0 tools in 1 subcategory
Unit Converters
19 tools available
Length Converters
6 tools available
Inch to Centimeter Converter
Convert inches to centimeters instantly. 1 inch = 2.54 cm. Perfect for international measurements, design, and engineering.
Centimeter to Inch Converter
Convert centimeters to inches with precision. 1 cm = 0.393701 inches. Essential for US measurements and specifications.
Feet to Meter Converter
Convert feet to meters accurately. 1 foot = 0.3048 meters. Perfect for construction, real estate, and height measurements.
Meter to Feet Converter
Convert meters to feet instantly. 1 meter = 3.28084 feet. Essential for architectural plans and property measurements.
Mile to Kilometer Converter
Convert miles to kilometers with precision. 1 mile = 1.60934 km. Perfect for travel, running, and distance calculations.
Kilometer to Mile Converter
Convert kilometers to miles accurately. 1 km = 0.621371 miles. Essential for international travel and fitness tracking.
Weight Converters
5 tools available
Kilogram to Pound Converter
Convert kilograms to pounds instantly. 1 kg = 2.20462 lbs. Perfect for weight tracking, shipping, and international trade.
Pound to Kilogram Converter
Convert pounds to kilograms with precision. 1 lb = 0.453592 kg. Essential for fitness, medical, and scientific calculations.
Gram to Ounce Converter
Convert grams to ounces accurately. 1 gram = 0.035274 oz. Perfect for cooking, jewelry, and small measurements.
Ounce to Gram Converter
Convert ounces to grams instantly. 1 oz = 28.3495 grams. Essential for recipes, nutrition, and precision measurements.
Stone to Kilogram Converter
Convert stones to kilograms with ease. 1 stone = 6.35029 kg. Perfect for UK weight measurements and health tracking.
Temperature Converters
4 tools available
Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit instantly. Formula: °F = (°C × 9/5) + 32. Perfect for weather, cooking, and international temperature conversions.
Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius with precision. Formula: °C = (°F - 32) × 5/9. Essential for metric temperature measurements.
Celsius to Kelvin Converter
Convert Celsius to Kelvin accurately. Formula: K = °C + 273.15. Perfect for scientific calculations and absolute temperature.
Kelvin to Celsius Converter
Convert Kelvin to Celsius instantly. Formula: °C = K - 273.15. Essential for physics and chemistry applications.
Volume Converters
4 tools available
Liter to Gallon Converter
Convert liters to gallons (US & UK). 1 liter = 0.264172 US gallons. Perfect for fuel calculations and liquid measurements.
Gallon to Liter Converter
Convert gallons to liters with precision. 1 US gallon = 3.78541 liters. Essential for international fuel and liquid conversions.
Milliliter to Fluid Ounce Converter
Convert milliliters to fluid ounces. 1 ml = 0.033814 fl oz (US). Perfect for cooking, medicine, and beverage measurements.
Fluid Ounce to Milliliter Converter
Convert fluid ounces to milliliters accurately. 1 fl oz (US) = 29.5735 ml. Essential for precise liquid measurements.
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