Unit Conversion Calculators

Length, weight, temperature, currency and other unit converters.

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Converters for everyday measures — length, weight, volume, temperature, speed — and for technical units in physics, electronics and chemistry. Each converts through one base unit with fixed conversion factors, so any pair of units in a converter gives consistent results.

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Physical Science

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Length

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Electrical

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Chemistry

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Weight

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All Unit Conversion Calculators

Acceleration ConverterConvert acceleration between meters per second squared, feet per second squared, and standard gravity (g).Angle Unit ConverterConvert an angle between degrees, radians, gradians, revolutions, arcminutes, and arcseconds.Area ConverterConvert an area between metric and imperial/land units — square meters, hectares, square kilometers, acres, square feet, square yards, square miles, and more.Capacitance ConverterConvert capacitance between farads, millifarads, microfarads, nanofarads, and picofarads.Celsius Fahrenheit ConverterConvert a temperature between Celsius and Fahrenheit, in either direction.Concentration ConverterConvert mass concentration between g/L, mg/L, mg/mL, µg/mL, kg/m³, and %(w/v).Cooking Unit ConverterConvert common recipe measurements — cups, tablespoons, teaspoons, milliliters, and fluid ounces — for scaling recipes up or down.Data Storage ConverterConvert a data size between bits, bytes, kilobytes, megabytes, gigabytes, and terabytes.Data Transfer Rate ConverterConvert a data transfer rate between bits per second, kbps, Mbps, Gbps, and their bytes-per- second equivalents.Density ConverterConvert density between kg/m³, g/cm³, lb/ft³, and lb/in³.Distance ConverterConvert a distance between metric and imperial units — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.Electric Current ConverterConvert electric current between microamperes, milliamperes, amperes, and kiloamperes.Energy ConverterConvert energy between joules, kilojoules, calories, kilocalories, watt-hours, kWh, and BTU.Force ConverterConvert force between newtons, kilonewtons, dynes, pound-force, and kilogram-force.Frequency ConverterConvert frequency between hertz, kilohertz, megahertz, gigahertz, and RPM.Fuel Economy ConverterConvert a fuel economy figure between km/l, miles per gallon (US and UK), and liters per 100km.Height ConverterConvert a height in centimeters to the everyday "feet and inches" format.Illumination ConverterConvert illuminance between lux and foot-candles.Inductance ConverterConvert inductance between henries, millihenries, and microhenries.Kilograms Pounds ConverterConvert a weight from kilograms to pounds.Kilometers Miles ConverterConvert a distance from kilometers to miles.Length ConverterConvert a length measurement between metric and imperial units — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.Luminance ConverterConvert luminance between candela per square meter (nit), and foot-lamberts.Meters Feet ConverterConvert a length from meters to feet.Miles Kilometers ConverterConvert a distance from miles to kilometers.Molarity ConverterConvert molar concentration between mol/L, mmol/L, µmol/L, and mol/m³.Molecular Weight CalculatorCalculate the molecular weight of a chemical compound from its formula, including nested parentheses like Ca(OH)2.Number Base ConverterConvert a number between any two numeral bases, from binary (base 2) up to base 36.Pace ConverterConvert a running or cycling pace between minutes per km and minutes per mile, along with the equivalent speed.Parts Per Million CalculatorConvert between parts per million (ppm) and other ratio units — percent, ppb, and ppt.Pounds Kilograms ConverterConvert a weight from pounds to kilograms.Power ConverterConvert power between watts, kilowatts, megawatts, horsepower (hp), and metric horsepower (PS).Pressure ConverterConvert pressure between pascals, kilopascals, bar, atmospheres, PSI, and mmHg.Resistance ConverterConvert electrical resistance between milliohms, ohms, kilohms, and megohms.Speed ConverterConvert a speed between units — meters per second, kilometers per hour, miles per hour, knots, and feet per second.Temperature ConverterConvert a temperature between Celsius, Fahrenheit, and Kelvin.Time Unit ConverterConvert a duration between time units — milliseconds, seconds, minutes, hours, days, weeks, months, and years.Torque ConverterConvert torque between newton-meters, kilogram-force-meters, pound-feet, and pound-inches.Voltage ConverterConvert voltage between microvolts, millivolts, volts, and kilovolts.Volume ConverterConvert a volume between metric and US customary units — milliliters, liters, cubic meters, gallons, quarts, cups, and more.Weight ConverterConvert a weight between metric and imperial units — milligrams, grams, kilograms, tonnes, pounds, and ounces.

Why a "GB" can mean two sizes

Storage makers label capacity in decimal units (1 GB = 1,000,000,000 bytes), while most operating systems show binary units (1 GB = 1,073,741,824 bytes). A drive sold as 1 TB therefore shows as about 931 GB. CalcuTool's data-storage converter uses the binary convention, so it matches what your computer displays.

Guide last updated 24-09-2026.

Unit Conversion Calculator Guides

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Unit Conversion2 min read

Celsius, Fahrenheit, and Kelvin Conversion Explained (Why It's Not Just Multiplication)

Unlike most unit conversions (which are a single multiplication), converting between temperature scales needs both a multiplication AND an addition or subtraction, because Celsius, Fahrenheit, and Kelvin don't share the same zero point — this is why there's exactly one temperature, −40°, where Celsius and Fahrenheit happen to read the same number.

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Unit Conversion1 min read

Converting Bar and PSI for Tire Pressure: A Worked Example

Running real tire-pressure values through the pressure converter's formula shows exactly how 2 bar becomes 29.007548 PSI, and how the same base-pascal math handles blood-pressure and atmospheric readings too.

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Unit Conversion1 min read

How a Running Pace Is Converted Between Km and Miles

Converting a pace from minutes-per-km to minutes-per-mile goes through speed as an intermediate step — pace becomes a speed, that speed converts between distance units, then converts back into a pace in the new unit.

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Unit Conversion1 min read

How Acceleration Is Converted Between m/s², ft/s², and g-Force

Acceleration converts between units by routing through meters per second squared as a common base — g-force uses the fixed 9.80665 m/s² standard gravity constant to bridge to the rest.

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Unit Conversion1 min read

How Data Storage Sizes Are Converted

Converting between bytes, kilobytes, megabytes, gigabytes, and terabytes uses the binary (1024-based) convention that Windows, macOS, and file managers report sizes in — not the 1000-based convention some manufacturers and standards bodies use instead.

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Unit Conversion1 min read

How Data Transfer Rates Are Converted

Network speeds like Mbps and Gbps convert using a 1,000-based decimal convention — a different base than data storage sizes use — and converting between bit-based and byte-based rates always involves an extra factor of 8.

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