Unit Converter
Convert length, weight, temperature, area, volume, speed, time, data, pressure and energy — live, with every unit in the category converted at once.
Category: Length
Result
All units
| Unit | Symbol | Value | Copy |
|---|---|---|---|
| Metric | |||
| Kilometre | km | 0.00001 | |
| Metre | m | 0.01 | |
| Centimetre | cm | 1 | |
| Millimetre | mm | 10 | |
| Micrometre | µm | 10,000 | |
| Nanometre | nm | 10,000,000 | |
| Imperial & UK | |||
| Inch | in | 0.393701 | |
| Foot | ft | 0.0328084 | |
| Yard | yd | 0.0109361 | |
| Mile | mi | 0.00000621371 | |
| Other | |||
| Nautical mile | nmi | 0.00000539957 | |
| Light year | ly | 1.057e-18 | |
| Astronomical unit | au | 6.68459e-14 | |
| Parsec | pc | 3.24078e-19 | |
| Ångström | Å | 100,000,000 | |
Conversion factors for every unit
One of each unit expressed in the base unit of this category (Metre).
| Unit | Symbol | In Metre |
|---|---|---|
| Kilometre | km | 1,000 |
| Metre | m | 1 |
| Centimetre | cm | 0.01 |
| Millimetre | mm | 0.001 |
| Micrometre | µm | 0.000001 |
| Nanometre | nm | 1e-9 |
| Inch | in | 0.0254 |
| Foot | ft | 0.3048 |
| Yard | yd | 0.9144 |
| Mile | mi | 1,609.344 |
| Nautical mile | nmi | 1,852 |
| Light year | ly | 9.46073047258e+15 |
| Astronomical unit | au | 149,597,870,700 |
| Parsec | pc | 3.08567758149e+16 |
| Ångström | Å | 1e-10 |
How to use
- Pick a category tab: Length, Weight, Temperature, Area, Volume, Speed, Time, Data, Pressure or Energy.
- Type the number in Value, then choose the From and To units — ⇄ Swap flips the pair.
- Set Precision to Auto or to a fixed number of significant digits.
- Read the converted value with its equation, the reverse conversion and the exact/approx badge.
- Copy any row of the ‘All units’ table, or use Share link to send the same conversion.
FAQ
Why can’t temperature be converted with a simple multiplier?
Temperature scales do not share a zero point, so the conversion is affine, not proportional: 0 °C is 32 °F, not 0 °F. This converter uses °F = °C × 9/5 + 32 and its inverses, and checks every input against absolute zero.
Is a US gallon the same as an imperial gallon?
No. A US gallon is 3.785411784 litres and an imperial (UK) gallon is 4.54609 litres, about 20% larger. The same applies to pints and fluid ounces, so US and imperial units are listed separately here.
Is a gigabyte 1,000 or 1,024 megabytes?
Both conventions exist. Decimal units (kB, MB, GB) are powers of 1,000 and are what storage manufacturers and network speeds use; binary units (KiB, MiB, GiB) are powers of 1,024 and are what most operating systems report. This converter shows both groups side by side.
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