TurboCalculation
Instant Results · NIST-Verified · Mobile-Friendly

Fast, Accurate Calculators & Converters

450+ free online calculators and unit converters. Math, electrical, finance, weight, temperature and more. Every formula verified against NIST standards.

Math CalculatorsUnit Converters

All Calculator Categories

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Math Calculators

48 tools

Percentage, square root, fractions, trig, logarithms and more.

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Unit Conversion

200+ pages

Weight, length, temperature, energy, power, frequency and more.

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Electrical

45 tools

Ohm's law, watts, amps, volts, kWh, electricity cost and more.

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Finance

13 tools

Mortgage, compound interest, VAT, discount, tip and more.

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Time Calculators

40 pages

Age, date, time zones, hours, seconds and more.

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Online Tools

38 tools

Stopwatch, timer, notepad, password generator and more.

Most Popular Tools

Percentage Calculatorkg to lbsCelsius to FahrenheitSquare Root CalculatorOhm's Law CalculatorMortgage CalculatorMiles to KilometersCompound Interest
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NIST-Verified

Every formula sourced from NIST, ISO, or BIPM international standards.

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Instant Results

All calculations run in your browser. No servers, no delays.

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Mobile-First

Designed for every screen size from 320px up.