Online Unit Converter

About Online Unit Converter

Online-Unit-Converter.com is a free unit conversion service that will convert the most popular units of distance, temperature, volume, time, speed, mass, power, density, pressure, energy and many others.

Our site is designed for easy access from both desktop and mobile. Feel free to bookmark the site and use it as your own personal reference tool.

Online-Unit-Converter.com allows you to perform over 25,000 unit conversions, between nearly 1000 units, organized in 21 categories. It’s a quick and easy way to convert measurements from one unit to another. New units can be added if needed, feel free to suggest. And don’t forget to bookmark this site before you leave.

Weight
Length
Volume
Area
Temperature
Speed
Acceleration
Time
Pressure
Currency
Power
Energy
Torque
Volume flow
Mass flow
Angle
Density
Luminance
Storage
Data
Fuel

Converssion groups

Mass and Weight Converter

Metric, Avoirdupois, Troy, Apothecaries, Japanese, Chinese Imperial, Thai, Hong Kong, Old Russian, Old French, Old German, Ancient Roman, Ancient Greek, Biblical, Baha’i Faith. Kilograms, Ounces, Pounds, Troy Pounds, Stones, Tons, Carats and more …

Distance and Length Converter

Metric, British (Imperial) And U.S. System, Japanese, Chinese Imperial, Thai, Nautical, Geographical (German), Typographical (British and U.S. – ATA system), Typographical (Europe – Didot system), Astronomical, Old French, Old Spanish and Portuguese, Old Russian, Ancient Roman, Biblical, Ancient Greek. Millimeters, Centimeters, Inches, Feet, Yards, Meters, Kilometers, Miles, Mils, Rods, Fathoms, Nautical Miles and more …

Capacity and Volume Converter

Metric, U.S. Liquid Measure, U.S. Dry Measure, British Imperial Liquid And Dry, British and U.S. derivatives of length units, Cooking (U.S.), Cooking (International), Japanese, Chinese Imperial, Thai, Old French, Old Russian Liquid Measure, Old Russian Dry Measure, Ancient Roman Liquid Measure, Ancient Roman Dry Measure, Biblical Dry Measure, Biblical Liquid Measure. Liquid and Dry. Liters, Fluid Ounces, Pints, Quarts, Gallons, Milliliter/cc, Barrels, Gill, Hogshead and more …

Area Converter

Metric, British (Imperial) And U.S. System, Japanese, Chinese Imperial, Thai, Old French, Old Spanish, Old Russian, Ancient Roman. Square centimeter, Square meter, Square inch, Square foot, Square mile, Square Kilometer, Acres, Circles and more …

Temperature Converter

Scale, Increment. Celsius, Fahrenheit, Rankine, Reaumur, and Kelvin and more …

Speed Converter

Metric, British (Imperial) And U.S. System, For Runners and Joggers, Nautical, Other. Centimeters/second, Meters/second, Kilometers/hour, Feet/second, Feet/minute, Miles/hour, Knots, Mach and more …

Acceleration Converter

Metric, British (Imperial) And U.S. System, Other, Car performance, Free Fall Acceleration. Kilometer per second squared, Standard acceleration of free fall on Earth, Galileo, seconds from 0 to 100 mph and more …

Time Converter

Common, Astronomical. Century, Gregorian year, Anomalistic year, Dracontic month and more …

Pressure and Stress Converter

Metric, British and U.S. (Imperial system), Mercury, Water, Atmosphere. Dyne/sq cm, Pascal, Poundal/sq foot, Torr, inch H2O, Inch mercury and more …

Circular Measure Converter

Common, Nautical, Artillery. Circumference, Sextant, Radian, Minute, German thousandth and more …

Power Converter

International System (SI), Common, British and American. Watts, BTU/hour, Foot-lbs/second, Horsepower, Kilowatts and more …

Energy and Work Converter

International System (SI), Common, British and American, TNT energy equivalent. Joules, Btu, Calories, Electronvolt, Erg, Watt hour, Therm, Toe, Tce and more …

Torque Converter

Metric, British and U.S. Pound-force Foot, Pound-force Inch, Kilogram-force Meter, and Newton meter and more …

Volumetric flow rate Converter

Metric, U.S. and British Imperial. Cubic meter per second, Liter per hour, U.S. gallon per second, Cubic foot per day and more …

Mass flow rate Converter

Metric, U.S. and British Imperial. Tonne per second, Gram per minute, Short (US) ton per second, Ounce per day and more …

Cooking Converter

U.S. and British Kitchen, Metric (European) Kitchen. Pounds, Ounces, Cups, Tea spoons and more …

Weight to Volume Converter

Metric Weight/Mass, Metric Volume, U.S. Weight/Mass, U.S. Volume. Kilograms, Liter, Pounds, Dry gallons and more …

Fractions and Percent Converter

Quantity, Percentages and Parts, Fractions, Amount of Substance, Number of Performers. Pair, Baker’s dozen, Permille , Percent, One fifth and more …

Computer Storage Converter

Data Storage, Transmission. Gigabit, Kilobit, Gigabyte, Byte and more …

Data Transfer Rate Converter

Basic Units, Byte-based, Data Transfer Time, Computer Connection Speed, Transfer Rate per Different Time. Kilobit per second, Byte per second, Second per megabyte, ADSL, T1, Ethernet 10BASE-T and more …

Fuel Economy Converter

Metric, U.S. system, British system. Litres per 100 km, Miles per gallon, Gallons per 100 miles and more …