Length Converter
Convert between metric and imperial lengths instantly.
Free length converter: switch between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles instantly, in both directions.
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About Length Converter
Millimeters for a screw, centimeters for a sleeve, kilometers for a road trip, length units follow the scale of the job, and the world can't agree on which scale to use. Recipes, clothing sizes, property dimensions, and DIY plans all cross the metric–imperial divide, usually at the worst possible moment.
This converter covers the everyday range, millimeters, centimeters, meters, and kilometers on the metric side; inches, feet, yards, and miles on the imperial side, converting instantly in both directions. The ratios are exact by definition: an inch is precisely 2.54 centimeters and a yard is exactly 0.9144 meters, so a mile lands at exactly 1,609.344 meters. Results are only ever rounded for display, never approximated in the math.
Type a value, choose the unit you have and the one you want, and use the swap button to flip direction in one tap. Whether you're checking if imported furniture fits a wall measured in feet, converting a 10K race distance, or reading a pattern that mixes inches and centimeters, the answer is one keystroke away.
How to use Length Converter
- Type the value to convert.
- Choose the from and to units.
- Use Swap to reverse the direction instantly.
Why use this tool?
- Metric and imperial units in one tool
- Instant conversion with a swap button
- Free with no signup
Tips for best results
- The inch is defined as exactly 2.54 cm, metric–imperial length conversions are exact, not approximate.
- For clothing, convert body measurements to the retailer's unit before trusting a size chart.
- A quick mental check: a meter is about 3.28 feet and a kilometer about 0.62 miles, then let the tool give the exact figure.
- When a plan mixes units (inches for trim, feet for walls), convert everything to one unit before doing any math.
- Negative values are accepted for offsets and coordinates, though a negative physical length is usually a data-entry slip.