Unit Converter

Convert between length, weight, time, speed, temperature, volume, area, and data storage — every unit in each category, not just the common ones.

Common conversions

Kilometer → Mile Mile → Kilometer Meter → Foot Foot → Meter Centimeter → Inch Inch → Centimeter Millimeter → Inch Inch → Millimeter Meter → Yard Yard → Meter Inch → Foot Foot → Inch Yard → Foot Foot → Yard Meter → Inch Inch → Meter Kilogram → Pound Pound → Kilogram Gram → Ounce Ounce → Gram Kilogram → Stone Stone → Kilogram Pound → Ounce Ounce → Pound Kilogram → Gram Gram → Kilogram Celsius → Fahrenheit Fahrenheit → Celsius Celsius → Kelvin Kelvin → Celsius Fahrenheit → Kelvin Kelvin → Fahrenheit Liter → Gallon Gallon → Liter Milliliter → Fluid ounce Fluid ounce → Milliliter Cup → Milliliter Milliliter → Cup Gallon → Gallon Gallon → Gallon Kilometer/hour → Mile/hour Mile/hour → Kilometer/hour Meter/second → Mile/hour Mile/hour → Meter/second Knot → Mile/hour Mile/hour → Knot Megabyte → Gigabyte Gigabyte → Megabyte Gigabyte → Terabyte Terabyte → Gigabyte Kilobyte → Megabyte Megabyte → Kilobyte Byte → Bit Bit → Byte Acre → Hectare Hectare → Acre Square meter → Square foot Square foot → Square meter Square kilometer → Square mile Square mile → Square kilometer Hour → Minute Minute → Hour Day → Hour Hour → Day Week → Day Day → Week

About this tool

Most unit converters online cover the handful of conversions people search for most — kilometers to miles, kilograms to pounds — and stop there. This one doesn't: across the eight categories here (Length, Weight, Time, Speed, Temperature, Volume, Area, and Data Storage) there are over 200 individual units, including the ones the popular converters usually skip — rods, chains, and furlongs alongside meters and miles; troy ounces and grains alongside kilograms; the properly distinct decimal (KB, MB, GB) and binary (KiB, MiB, GiB) data-storage scales that most tools quietly conflate; and all eight temperature scales that have ever been in real use, not just the three anyone actually uses today.

Pick a category from the tabs, then type into either field — the other updates instantly, in both directions, so you don't need to hunt for a "reverse" button. The swap button flips the two units in place if you picked them backwards. Every conversion factor was checked against reference values before this went live: 1 mile really does compute to 1.609344 km here, not a rounded approximation, and temperature conversions correctly handle the fact that Celsius and Fahrenheit don't share a zero point the way, say, meters and kilometers share theirs.

If you only ever need one specific category, the dedicated single-category converters (linked in the navigation) are lighter versions of exactly this same tool, focused on one unit type at a time. Everything computes locally in your browser — there's no lookup service or API call involved, just arithmetic, so it works offline once the page has loaded and nothing about what you're converting is ever sent anywhere.