Unit Converter — Length, Weight, Temperature, Volume & More
Convert between metric and imperial units across eight groups — length, weight, temperature, area, volume, speed, time, and digital storage — with the answer updating as you type. Alongside the single conversion you asked for, a table shows the same amount in every other unit in the group, which saves the second and third lookup you were about to do anyway.
Conversion factors are the exact internationally defined values, so an inch is 0.0254 m rather than a rounded approximation, US and imperial gallons are kept apart, and megabytes are never quietly treated as mebibytes. No signup is needed, and the arithmetic runs in your browser.
How to use Unit Converter
- Pick what you are converting — length, weight, temperature, and so on.
- Type the amount in the "From" field.
- Choose the source and target units from the two dropdowns.
- Read the result, or scan the table below for every other unit at once.
- Use the swap button to reverse the direction without retyping.
Features
- Eight unit groups — Length, weight and mass, temperature, area, volume, speed, time, and digital storage, covering more than 60 units in total.
- Exact definitions, not approximations — Uses the internationally agreed factors: 1 in = 0.0254 m, 1 lb = 0.45359237 kg, 1 mi = 1609.344 m. No accumulated rounding error.
- Every unit shown at once — The table converts your amount into all units in the group, so you do not need three separate lookups to compare options.
- US and imperial kept separate — US and UK gallons, pints, and fluid ounces are listed as distinct units, because an imperial gallon is about 20% larger than a US one.
- Decimal and binary storage units — kB, MB and GB (powers of 1000) stay separate from KiB, MiB and GiB (powers of 1024), which is what makes a "1 TB" drive show as 931 GB.
Frequently Asked Questions
Why is my 1 TB hard drive only 931 GB in Windows?
The manufacturer counts a terabyte as 1,000,000,000,000 bytes, the decimal definition. Windows displays the same number of bytes using binary units — dividing by 1024 three times — but labels the result "GB" instead of "GiB". Nothing is missing; the two systems just measure with different rulers. Convert 1 TB to TiB here and you get 0.909, the same discrepancy.
Is a US gallon the same as an imperial gallon?
No, and the gap is large enough to matter. A US gallon is 3.785 litres, an imperial (UK) gallon is 4.546 — about 20% bigger. The same applies to pints and fluid ounces, and all of them are listed separately here so a recipe or a fuel-economy figure does not silently come out a fifth off.
Why is temperature handled differently from other units?
Because Celsius and Fahrenheit have different zero points, converting between them needs an offset as well as a scale — °F = °C × 1.8 + 32, not a single multiplication. That is why 0°C is 32°F rather than 0°F. Kelvin shares the Celsius scale but starts at absolute zero, so it is a straight 273.15 offset.
How precise are the results?
Values are computed at full double precision and displayed to ten significant digits, then trimmed of trailing zeros. Very large or very small numbers switch to scientific notation to stay readable. For engineering work the underlying factors are exact by definition, so the only rounding is in what is shown, not in what is calculated.