Everyday & industry
Length Converter
Convert length and distance between common metric and imperial units, with a single conversion or a grouped multi-unit table.
Enter a length or distance, choose the source unit, and convert it instantly to another common metric or imperial unit.
Conversions use fixed mathematical relationships and do not require external data.
Results update as you edit. Calculations run locally in your browser; your inputs are not saved.
Choose your units.
Calculated locally · Length Converter
Your Length Conversion
The converted value represents the same length expressed in a different unit.
Result Detail
Conversion Breakdown
Source value × source-to-metres factor ÷ target-to-metres factor. Displayed decimals may be rounded; internal values are not.
About this calculator
Quick conversion references
These are static reference relationships, not results calculated from your inputs.
- 1 inch = 2.54 cm.
- 1 foot = 30.48 cm.
- 1 yard = 0.9144 m.
- 1 mile = 1.609344 km.
- 1 km ≈ 0.621371 miles.
- 1 metre ≈ 3.28084 feet.
Exact relationships, readable display
The converter multiplies the source value by its exact metre factor, then divides by the target unit’s exact metre factor. No rounded displayed result is used as an intermediate.
- Auto uses up to two decimal places for values of 1,000 or more, four for values of at least 1, and six for values below 1. Unnecessary trailing zeros are removed.
- Use Decimal Places for a different display precision. Extremely small or large values use scientific notation when a normal decimal display becomes impractical.
- A nautical mile is exactly 1,852 metres. This is a length conversion only, not a navigation, mapping or route tool.
Frequently asked questions
How do I convert kilometres to miles?
Divide kilometres by 1.609344. One kilometre is approximately 0.6213711922 miles; displayed decimals depend on the selected precision.
How do I convert miles to kilometres?
Multiply miles by 1.609344. One international mile is exactly 1.609344 kilometres.
How many centimetres are in an inch?
One international inch is exactly 2.54 centimetres.
How many feet are in a metre?
Divide metres by 0.3048. One metre is approximately 3.280839895 feet.
What is the difference between a mile and a nautical mile?
An international mile is exactly 1,609.344 metres. A nautical mile is exactly 1,852 metres, so it is longer. Both are supported here as fixed length units.
Are these conversions exact?
Relationships such as inch, foot and mile to metre are defined exactly. Calculations use those fixed constants without display rounding in between; displayed decimals may be rounded for readability, and browser arithmetic has finite numeric precision.
A mathematical length conversion utility only. No geographic distances, maps, routes, GPS, accounts or saved inputs are used.