Length Converter
Convert mm, cm, metres, km, inches, feet, yards, miles and nautical miles — with a formula and a ready table.
Result
How to use
- 1
Type the length you want to convert.
- 2
Pick the From and To units — or press Swap to flip them.
- 3
See the answer, the formula, every other unit and a ready table of common values.
Questions
How many centimetres are in a foot?
1 foot = 12 inches = 30.48 cm exactly, because the inch is defined as exactly 2.54 cm. So 5 ft 6 in = 66 in = 167.64 cm.
What is a nautical mile?
A nautical mile is exactly 1,852 metres. It is used at sea and in aviation; a speed of one nautical mile per hour is a knot.
How do I convert height in feet and inches to cm?
Turn it into inches first (feet × 12 + inches), then multiply by 2.54. Or type the height in feet with a decimal here, e.g. 5.5 ft = 5 ft 6 in.
About this Length tool
Length Converter — Convert mm, cm, metres, km, inches, feet, yards, miles and nautical miles — with a formula and a ready table. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Type the length you want to convert.
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Results are estimates to help you plan. They are not financial, tax or medical advice.