Length and Distance Converter
Convert metres, feet, inches, miles, kilometres and more.
Length Converter
Universal unit converter engine
What does Length Converter do?
Convert between 22 units of length and distance, from nanometres to parsecs. Metric, imperial, marine and astronomical units are grouped separately so you always know which system you are in.
How to Use Length Converter
- 1Enter a valueAny number, including decimals.
- 2Choose the unitsFrom and to, or swap with one tap.
- 3Read the resultsThe chosen pair plus every other unit below.
Key Features
- 22 units from nanometres to parsecs
- Exact definitions: 1 inch = 25.4 mm, 1 mile = 1609.344 m
- Feet-and-inches composite mode for heights
- Every unit in the category shown simultaneously
- Quick-reference conversion table for common values
Frequently Asked Questions
How many centimetres are in an inch?
Exactly 2.54. That value is a definition rather than a measurement, agreed internationally in 1959, which is why every other imperial length converts exactly.
How do I convert my height?
Use the feet-and-inches mode. It takes two fields and returns centimetres, so 5 ft 9 in gives 175.26 cm without you having to convert the inches separately.
What is a nautical mile?
Exactly 1,852 metres, originally one minute of latitude. It is used in marine and air navigation because it maps directly onto charts, and speed in nautical miles per hour is a knot.
How far is a light year?
Exactly 9,460,730,472,580,800 metres — the distance light travels in a Julian year. It is a distance, not a time, despite the name.
Conversions run in your browser using fixed, published factors. Nothing you enter is transmitted, and the tool keeps working with the network disconnected.
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