📏 Length Converter
From a DIY project in inches to a distance in miles on a US road sign: convert any length exactly to the unit you need. This calculator covers both the metric system (millimetre to kilometre) and the imperial/US system (inch, foot, yard, mile).
Result
328.084 ft
Formula
Result = (value × from-factor) ÷ to-factor, relative to the metre
Every length unit has a fixed, exact conversion factor to metres (for example 1 inch = 0.0254 m, 1 mile = 1609.344 m). The calculator converts to metres first and then from metres to the target unit, so every combination works without a separate formula per unit pair.
Steps
- 1Enter the value you want to convert.
- 2Choose the unit to convert from and to.
- 3Read the exact result instantly.
Length units in metres
| Unit | In metres |
|---|---|
| 1 millimetre (mm) | 0.001 |
| 1 centimetre (cm) | 0.01 |
| 1 metre (m) | 1 |
| 1 kilometre (km) | 1,000 |
| 1 inch | 0.0254 |
| 1 foot (ft) | 0.3048 |
| 1 yard (yd) | 0.9144 |
| 1 mile | 1,609.344 |
All factors are internationally defined as exact values, so there is no rounding error in the conversion.
commonMistakes
- Confusing feet and yards: 1 yard equals 3 feet, they are not the same.
- Assuming a "mile" is the same as a nautical mile; a land mile is 1609.344 m, a nautical mile is 1852 m.
- Swapping the comma and period as decimal separators between countries (1,000 can mean either one thousand or one point zero).
useCases
- Converting a furniture size from a US webshop into centimetres.
- Converting travel distances on US or UK road signs (miles) into kilometres.
- Converting construction or DIY drawings in inches and feet into the metric system.