Length converter
Convert lengths between metric and imperial units. Enter a value, choose units, then select Calculate.
We convert your input to metres, then convert to your chosen unit. Results may vary slightly due to rounding.
How this calculator works
This calculator converts your input to a base unit (metres), then converts it to the target unit using standard conversion factors.
Examples: 1 inch = 0.0254 m, 1 foot = 0.3048 m, 1 yard = 0.9144 m, 1 mile = 1609.344 m.
Results may vary slightly due to rounding.
What this calculator does
This length converter switches between metric and imperial units such as mm, cm, m, km, inches, feet, yards, and miles. Enter a value, choose the units, and it converts the length instantly.
It is useful for travel, DIY, sports distances, and everyday unit comparisons.
How the formula works
We convert your input to metres as a base unit, then convert from metres to the target unit using standard conversion factors (for example, 1 inch = 0.0254 m and 1 mile = 1,609.344 m).
This approach keeps the maths consistent across all units.
Worked example
Example: 2.5 metres to feet. The calculator converts 2.5 m to about 8.2 ft.
If you convert 5 km to miles, the result is about 3.11 miles.
Common mistakes
- Mixing up cm and mm when entering values.
- Choosing the wrong “from” unit.
- Expecting perfect round numbers after conversion.
- Forgetting that miles and kilometres are not interchangeable.
When to use this calculator
Use this when you need quick unit conversions for distances, measurements, or travel. For height or weight, use the dedicated Height and Weight converters.
FAQs
How many km in a mile?
One mile is approximately 1.609 kilometres.
Can I use decimals?
Yes, decimals are supported for precise measurements.
Why does my result look slightly different?
Small differences are usually due to rounding to keep results readable.