Unit Converter — Length, Weight, Temperature, Data & More
Convert length, weight, temperature, area, volume, speed, data, pressure, energy, angle and fuel economy with exact factors.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
Convert between more than 90 everyday units in one place: length, weight, temperature, area, volume, speed, time, data storage, pressure, energy, angle and fuel economy. Pick a measurement, type a value and you also get a table showing it in every other unit of that kind.
Step by step
- Choose the measurement: Pick a category such as Length, Weight / mass or Temperature from the Measurement dropdown.
- Enter a value: Type your number in From and choose its unit underneath.
- Pick the target unit: Choose the unit you want in the To dropdown — the result updates as you type.
- Compare every unit: Scroll to the table to see the same value in all units of that category, each with its own Copy button.
Handy for
Recipes
Turn cups, tablespoons and fluid ounces into millilitres, or ounces into grams.
Travel
Convert km/h to mph, kilometres to miles and litres per 100 km to miles per gallon.
Home and DIY
Switch between square feet and square metres, or inches and millimetres for materials.
Study
Check homework answers for pressure, energy or angle conversions with exact factors.
Good to know
Temperature and fuel economy aren’t simple multiplications — the converter uses the proper formulas for them.
US and UK gallons differ by about 20%; both are listed separately.
Months and years in the Time category are averages (a year is 365.2425 days).
Questions
How accurate are the conversions?
They use the exact international definitions — 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 pound = 0.45359237 kg and 1 mile = 1.609344 km — so results are exact up to the 10 significant digits shown.
Why is “1 MB” two different numbers?
Data units come in decimal (1 MB = 1,000,000 bytes) and binary (1 MiB = 1,048,576 bytes) forms. Both are listed; see the Data Storage Converter for a side-by-side view.
Can I convert currencies?
Not here — currency rates change every minute and need a live data feed, while this tool works entirely offline.
Is anything sent to a server?
No. Every calculation runs in your browser, so the numbers you type never leave your device. The page keeps working offline once it has loaded.
More Calculators & Utilities tools
- CM to Inches Converter — Turn centimetres into inches instantly, with a ready reference table of common lengths.
- Inches to CM Converter — Turn inches into centimetres using the exact 2.54 cm definition, with a quick reference table.
- CM to Feet & Inches Converter — Convert centimetres to feet and to feet-and-inches — handy for heights on forms and profiles.
- KG to LBS Converter — Convert kilograms to pounds using the exact international pound definition.
- LBS to KG Converter — Convert pounds to kilograms precisely, with a table of common body and luggage weights.
- Celsius to Fahrenheit Converter — Convert Celsius to Fahrenheit with the formula shown and a table of everyday temperatures.