Length Converter
Convert instantly between metric and imperial length units.
How to Use
- Enter a value and choose the unit you're converting from.
- Choose the unit you want to convert to.
- The result updates instantly as you type — there's no Convert button to press.
- Use the swap button to reverse the conversion direction.
Formula
value_in_target_unit = value × (from_unit_to_meters ÷ to_unit_to_meters). Every unit converts through meters as the common base, so no conversion pair needs its own hard-coded formula.
Worked Example
Convert 1 inch to centimeters.
- 1 inch equals exactly 0.0254 meters.
- 0.0254 meters ÷ 0.01 (meters per centimeter) = 2.54
Result: 2.54 cm
Conversion Table
| Unit | Symbol |
|---|---|
| Millimeters | mm |
| Centimeters | cm |
| Meters | m |
| Kilometers | km |
| Inches | in |
| Feet | ft |
| Yards | yd |
| Miles | mi |
About This Tool
What this tool does
Converts a length or distance value between metric units (millimeters, centimeters, meters, kilometers) and imperial/US units (inches, feet, yards, miles).
When to use it
Use it whenever you need to translate a measurement between metric and imperial — reading a recipe, following an international size chart, converting a room measurement, or checking a distance.
What the result means
The result is the equivalent length in the target unit, rounded to a readable number of decimal places without losing meaningful precision.
Assumptions & limitations
All imperial conversion factors use the exact international definitions agreed in 1959 (1 inch = 25.4 mm exactly), not rounded approximations, so results stay accurate however many times a value is converted back and forth.