35 published tools
Free Online Calculators and Converters
Choose a calculator for math, health, money, dates, unit conversion or digital tasks. Each tool opens on its own page.
Math & Algebra
Equations, fractions, percentages and number tools.
Scientific CalculatorUse standard and scientific operations in one calculator.Open calculatorPercentage CalculatorCalculate percentages, increases, decreases and percentage differences.Open calculatorDerivative CalculatorFind derivatives for supported mathematical expressions.Open calculatorFraction CalculatorAdd, subtract, multiply and divide fractions.Open calculatorPrime Number CheckerCheck whether a whole number is prime.Open calculatorLCM & GCD CalculatorFind the least common multiple and greatest common divisor.Open calculatorMatrix CalculatorPerform common matrix operations.Open calculatorQuadratic Equation CalculatorSolve quadratic equations and view the roots.Open calculatorLinear Equation SolverSolve one-variable linear equations.Open calculatorSystem of Equations SolverSolve two-variable or three-variable linear systems.Open calculator
Age CalculatorCalculate age from a date of birth.Open calculatorDog Years to Human Years CalculatorEstimate a dog's age in human-year terms.Open calculatorBMI CalculatorCalculate adult body mass index from height and weight.Open calculatorCalorie CalculatorEstimate daily calorie needs from entered details.Open calculatorDays Between Dates CalculatorCount the time between two dates.Open calculatorSleep CalculatorEstimate bedtime or wake-up times using adjustable sleep assumptions.Open calculator
Money & Education
Pay, discounts, tips and grade calculations.
Hourly to Salary CalculatorConvert hourly pay into weekly, monthly and annual estimates.Open calculatorDiscount CalculatorCalculate a sale price and the amount saved.Open calculatorTip CalculatorCalculate a tip and split the bill.Open calculatorGPA CalculatorCalculate GPA from courses, grades and credits.Open calculator
Converters
Convert units, number systems, time zones and color values.
Distance CalculatorCalculate distance using supported inputs.Open calculatorData Storage ConverterConvert between common digital storage units.Open calculatorWorld Time Zone ConverterCompare times between cities and time zones.Open calculatorTemperature ConverterConvert Celsius, Fahrenheit and Kelvin values.Open calculatorWeight & Mass ConverterConvert between common weight and mass units.Open calculatorLength ConverterConvert metric and imperial length units.Open calculatorBinary / Hex / Decimal ConverterConvert values between common number bases.Open calculatorColor Code ConverterConvert color values between supported formats.Open calculator
Technology & Digital
Battery, computer, web and text tools.
Battery Life CalculatorEstimate battery runtime from capacity, voltage, load and efficiency.Open calculatorPC Bottleneck CalculatorCompare selected CPU and GPU combinations.Open calculatorDownload Time CalculatorEstimate download time from file size and connection speed.Open calculatorPassword Strength CheckerReview password length and character variety in the browser.Open calculatorRandom Number / Password GeneratorGenerate random numbers or passwords.Open calculatorQR Code GeneratorCreate a QR code from entered content.Open calculatorWord & Character CounterCount words, characters and related text totals.Open calculator
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