Length converters
46 conversions between 12 length units. Every page includes a live converter, the formula and a full conversion table.
Units covered
| Unit | Symbol | In meters |
|---|---|---|
| Meter | m | 1 |
| Kilometer | km | 1,000 |
| Centimeter | cm | 0.01 |
| Millimeter | mm | 0.001 |
| Micrometer | µm | 0.000001 |
| Nanometer | nm | 1.000000e-09 |
| Mile | mi | 1,609.344 |
| Yard | yd | 0.9144 |
| Foot | ft | 0.3048 |
| Inch | in | 0.0254 |
| Nautical mile | nmi | 1,852 |
| Light year | ly | 9.460730e+15 |
All length conversions
- Meters to Kilometers
- Meters to Centimeters
- Meters to Millimeters
- Meters to Miles
- Meters to Feet
- Meters to Inches
- Kilometers to Meters
- Kilometers to Centimeters
- Kilometers to Millimeters
- Kilometers to Miles
- Kilometers to Feet
- Kilometers to Inches
- Centimeters to Meters
- Centimeters to Kilometers
- Centimeters to Millimeters
- Centimeters to Miles
- Centimeters to Feet
- Centimeters to Inches
- Millimeters to Meters
- Millimeters to Kilometers
- Millimeters to Centimeters
- Millimeters to Miles
- Millimeters to Feet
- Millimeters to Inches
- Micrometers to Inches
- Nanometers to Inches
- Miles to Meters
- Miles to Kilometers
- Miles to Centimeters
- Miles to Millimeters
- Miles to Feet
- Miles to Inches
- Feet to Meters
- Feet to Kilometers
- Feet to Centimeters
- Feet to Millimeters
- Feet to Miles
- Feet to Inches
- Inches to Meters
- Inches to Kilometers
- Inches to Centimeters
- Inches to Millimeters
- Inches to Miles
- Inches to Feet
- Light Years to Miles
- Light Years to Feet
Where length conversions go wrong
The inch has been defined as exactly 25.4 mm since the international yard and pound agreement of 1959, so every imperial length conversion on this site is exact rather than measured. Before 1959 the US and the UK used slightly different inches, and the old US definition survives as the survey foot, which is larger by two parts per million. That is invisible on a tape measure and very visible across a county boundary, which is why US land surveys were still using it until it was officially retired.
The other recurring trap is writing feet and inches as a decimal. 5.2 does not mean 5 ft 2 in — as a decimal it is 5 ft 2.4 in, because a tenth of a foot is 1.2 inches. Height pages here treat the part after the point as a literal inch count, which is what people mean when they type it.