Length converter
Convert metric and imperial distances, including metres, feet, inches and miles.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same length quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Confusing the source and target units, or overlooking a prefix or case-sensitive symbol.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the length measurement guide · Calculation checks, sources and review limits
How do I express this length in another unit?
Enter the known length value and choose its source and target units. The converter expresses the same quantity in the selected target unit.
Common uses
- Compare distances or dimensions expressed in different units.
- Translate measurements before using them in a calculation.
How it works
The calculation passes through a shared base unit. Factors are stored centrally; calculations use floating-point arithmetic and display up to 12 significant digits. Keep extra precision until the final result.
Worked example
1 inch = 2.54 centimetres exactly.