Metric and imperial lengths
Whether you're checking your height in feet and inches, converting a screen size, or turning miles into kilometres, enter a value, choose the units and get the answer instantly. The table below lists the same length in every unit, from nanometres to nautical miles.
All conversions use exact definitions — 1 inch is exactly 2.54 cm and 1 mile exactly 1,609.344 m.
How to convert length
- 1
Enter the length
Any number.
- 2
Choose the from and to units
Swap them with one click.
- 3
Read the result
Or scan the full table.
Key features
11 units
Metric, imperial and nautical.
Exact factors
International definitions.
Every unit at once
Full conversion table.
Copy result
One click.
Common uses
- Height: Feet and inches to cm.
- Travel: Miles to km.
- DIY and shopping: Inches to cm for furniture and screens.
Common length conversions
| From | To |
|---|---|
| 1 inch | 2.54 cm |
| 1 foot | 30.48 cm |
| 5 ft 6 in | 167.64 cm |
| 1 mile | 1.609 km |
| 1 metre | 3.281 feet |
Tips and good to know
- Screen sizes (like a 55-inch TV) are measured diagonally.
- For areas like square feet, use the Area Converter.
Frequently asked questions
How do I convert cm to inches?
Divide by 2.54. 170 cm ÷ 2.54 = 66.93 inches (5 ft 6.9 in).
How many feet are in a metre?
About 3.2808 feet.
How many km is a mile?
1.609344 km.