๐ Length
Convert length units instantly: metre, kilometre, mile, foot, inch, centimetre and more. Free, accurate, no upload.
๐ Length
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About the Length Tool
Length conversion sits at the boundary between the metric and imperial systems, which is where most everyday confusion happens. Construction drawings in feet, product specifications in millimetres, running distances in kilometres, and screen sizes in inches all coexist, and getting a conversion wrong has practical consequences.
This converter handles metres, kilometres, centimetres, millimetres, miles, yards, feet, and inches with exact conversion factors. The relationships are defined by international agreement โ one inch is exactly 25.4 millimetres โ so results are precise rather than approximated. Calculation runs instantly in your browser.
How to Use Length
- Enter the value you want to convert.
- Select the unit you are converting from.
- Select the unit you want the result in.
- The converted value appears immediately.
When to Use This Tool
- Converting construction measurements between metric and imperial drawings
- Working out running or cycling distances between kilometres and miles
- Translating product dimensions from a specification sheet
- Converting height between centimetres and feet with inches
- Checking screen or display sizes quoted in inches
Things Worth Knowing
- One inch is defined as exactly 25.4 millimetres by international agreement.
- One mile equals exactly 1.609344 kilometres.
- Nautical miles differ from statute miles โ one nautical mile is 1852 metres exactly.
Quick Facts
| Tool name | Length |
| Category | Unit Converters |
| Price | Free โ no account, no trial, no watermark |
| Where it runs | Entirely in your browser (client-side) |
| Files uploaded | None โ your data never leaves your device |
| File size limit | None imposed; limited only by device memory |
| Works offline | Yes, once the page has loaded |
| Platforms | Windows, macOS, Linux, Android, iOS |
Frequently Asked Questions
How many centimetres are in an inch?
Exactly 2.54. This is a defined value rather than a measurement, agreed internationally in 1959, so the conversion is exact rather than approximate.
How do I convert my height to feet and inches?
Divide your height in centimetres by 30.48 to get feet as a decimal, then multiply the fractional part by 12 for inches. 170 cm gives 5.577 feet, which is 5 feet 6.9 inches.
What is the difference between a mile and a nautical mile?
A statute mile is 1609.344 metres. A nautical mile is 1852 metres, originally defined as one minute of latitude, and is used in marine and air navigation.
Why does the world use different systems?
Historical accident, largely. Most countries adopted metric during the nineteenth and twentieth centuries; the United States retained customary units for everyday use while using metric in science and much of industry.