How do I convert inches to centimeters or miles to kilometers?
Length converter: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles. All at once, live.
Type a value in one unit, see the conversion to every other unit in a tile grid. Click a tile to copy the result.
How to use it
- Type a value and pick a unit (e.g. meter, inches, foot).
- Every other length unit shows the conversion automatically.
- Click any tile to copy the result.
When this is useful
The most common uses:
- Height in feet to centimeters. "5'10", how many cm?". 5 feet 10 inches = 178 cm. Classic for international forms.
- Wood or metal in inches. US lumber and metal stock are sized in inches. The converter gives you millimeters so you can find a metric equivalent.
- Statute miles to kilometers. "65 mph speed limit, what's that in km/h?". Statute miles differ from nautical miles.
- Nautical miles in shipping. A ship at 20 knots is doing 20 nautical miles per hour. 1 nautical mile = 1852 m.
- Furniture sizes from a US store. "27 inch monitor", that's 68.6 cm diagonal.
- Education and schoolwork. "How many cm in 0.7 km?" (700). Check the answer in a second.
Questions and answers
1 inch = 2.54 cm exactly. International standard since 1959. Same value everywhere.