Length Converter for the Classroom
Convert inches, feet, yards, miles, millimeters, centimeters, meters and kilometers.
About this length converter
This converter turns any length into any other: the metric units millimeters, centimeters, meters and kilometers, and the US customary units inches, feet, yards and miles. It uses the exact international definitions, such as 1 inch = 2.54 centimeters exactly.
Type a value, choose the units and the answer appears. The swap button reverses the direction, and the share link keeps the value and the units.
For a printable reference, use the measurement conversion chart on the math charts page.
How to use it
- Type a value.
- Choose the unit you are converting from and the unit you want.
- Read the result in the box.
- Press Swap to reverse the direction.
- Copy the link to share the exact conversion.
Classroom tips
- Have students estimate before they convert: is a meter longer or shorter than a yard?
- Measure a desk in inches and centimeters, then check the pair here.
- Use 2.54 centimeters per inch as the one fact students must remember; all the others follow from it.
- Compare a 100 meter dash with a 100 yard dash to make the units feel different.
Reviewed 2026-10-03. Conversion factors are exact definitions.
Frequently asked questions
Are the conversions exact?
The inch, foot, yard and mile are defined exactly in terms of the meter (1 inch = 0.0254 meters exactly), so the factors here are exact. Results are rounded for display.
How many centimeters are in a foot?
A foot is 12 inches, which is 30.48 centimeters exactly.
Can students use it on tests?
That is up to you. It is meant as a way to check practice and build a feel for the units.
Need a different tool?
Explore the whole Calcs family here.
Found a mistake?
Something looks wrong? Report a correction.
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