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Yes, our unit converter is 100% free to use with no hidden fees or limits. You can convert as many units as you need.

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Absolutely. Everything runs locally in your browser. We don't store, track, or transmit your conversion data to any servers.

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Once the page is loaded, the conversions happen purely in JavaScript on your device, meaning it can function even if your internet connection drops.

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⚡ 100% SECURE & CLIENT-SIDE CONVERSIONS

Free Online Unit Converter

Convert between 500+ units instantly. Length, weight, temperature, and more.
Everything runs fast, free, and completely in your browser.

Quick Links:cm → inches inches → cm km → miles miles → km

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BROWSE CATEGORIES

ALL CONVERSION CATEGORIES

Length & Distance

Convert between metric and imperial length units like meters, feet, inches, and miles.

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Centimeter to InchInch to CentimeterKilometer to Mile

Weight & Mass

Convert between kilograms, pounds, ounces, grams, and other weight units.

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Kilogram to PoundPound to KilogramGram to Ounce

Temperature

Convert between Celsius, Fahrenheit, and Kelvin.

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Celsius to FahrenheitFahrenheit to CelsiusCelsius to Kelvin

Area

Convert between square meters, square feet, acres, hectares, etc.

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Square Foot to Square MeterSquare Meter to Square FootAcre to Hectare

Volume & Capacity

Convert liters, gallons, cups, milliliters, cubic meters, and more.

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Liter to US GallonUS Gallon to LiterMilliliter to US Fluid Ounce

Speed & Velocity

Convert between kilometers per hour, miles per hour, meters per second, knots, etc.

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Kilometer per hour to Mile per hourMile per hour to Kilometer per hourMeter per second to Kilometer per hour

Time

Convert between seconds, minutes, hours, days, weeks, months, and years.

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Minute to SecondHour to MinuteDay to Hour

Data & Storage

Convert between bits, bytes, kilobytes, megabytes, gigabytes, and terabytes.

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Megabyte to GigabyteGigabyte to MegabyteGigabyte to Terabyte

Pressure

Convert between pascal, bar, psi, atmosphere, and mm Hg.

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Bar to Pound per square inchPound per square inch to BarStandard Atmosphere to Pascal

Energy

Convert between joules, calories, kilocalories, and kilowatt-hours.

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Gram calorie to JouleJoule to Gram calorieKilocalorie to Gram calorie

Power & Electricity

Convert between watts, kilowatts, horsepower, and other power units.

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Watt to KilowattKilowatt to WattKilowatt to Horsepower (Mechanical)

Frequency

Convert between hertz, kilohertz, megahertz, and gigahertz.

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Hertz to KilohertzMegahertz to Gigahertz

Angle & Rotation

Convert between degrees, radians, gradians, and minutes of arc.

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Degree to RadianRadian to Degree

Fuel Consumption

Convert between miles per gallon (MPG), liters per 100km, etc.

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Miles per Gallon (US) to Liters per 100kmLiters per 100km to Miles per Gallon (US)

Force

Convert between newtons, kilonewtons, pound-force, etc.

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Pound-force to NewtonKilogram-force to Newton

Torque

Convert between newton-meters, pound-foot, etc.

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Pound-foot to Newton-meterNewton-meter to Pound-foot

Flow Rate

Convert between liters per second, gallons per minute, etc.

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Gallon per minute (US) to Liter per minuteLiter per minute to Gallon per minute (US)

Density

Convert between kilograms per cubic meter, grams per cubic cm, etc.

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Gram per cubic centimeter to Kilogram per cubic meterPound per cubic foot to Kilogram per cubic meter

Illuminance

Convert between lux, foot-candle, etc.

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Foot-candle to LuxLux to Foot-candle

Radiation

Convert between gray, sievert, rad, rem, etc.

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Rad to GrayRem to SievertMillisievert to Sievert

Typography

Convert between pixels, points, ems, picas, etc.

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Pixel (Web) to EmPixel (Web) to RemPoint to Pixel (Web)

Cooking

Convert between cups, tablespoons, teaspoons, fluid ounces, etc.

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Cup (US) to MilliliterTablespoon (US) to MilliliterCup (US) to Fluid Ounce (US)

Shoe Size

Convert between US, UK, and European shoe sizes.

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US Men to EuropeanUS Women to EuropeanUK to European

Clothing Size

Convert between US, UK, and European clothing sizes.

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US Size to EU SizeUK Size to EU SizeItalian Size to EU Size

Blood Sugar

Convert between mg/dL and mmol/L.

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Millimoles per liter to Milligrams per deciliterMilligrams per deciliter to Millimoles per liter

General

Convert between miscellaneous items.

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Dozen to Single ItemGross to Dozen