Length Converter
Convert between meters, feet, miles, inches, kilometers, and more instantly.
About the Length Converter
The Length Converter turns any length or distance into another unit instantly — millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. Type a number, pick the unit you have and the unit you want, and the answer appears immediately. All the math runs in your browser, so it's instant and works offline once the page has loaded.
Length conversions come up everywhere: reading a recipe or manual written for another country, working on a DIY project with mixed measurements, doing homework, or planning travel. This tool removes the guesswork and the mental arithmetic.
How to use
- Enter a value in the "From" box.
- Choose the unit you're converting from in the first dropdown.
- Choose the unit you want in the second dropdown — the result updates as you type.
- Use the ⇄ swap button to reverse the direction (for example, switch from "meters → feet" to "feet → meters") without re-entering anything.
All conversions use exact, internationally standardized factors — for instance, 1 inch is exactly 2.54 cm and 1 mile is exactly 1,609.344 meters — so the results are accurate for engineering, schoolwork, and everyday use alike. Results are shown with enough significant figures to stay precise without cluttering the display.
Common conversions
- 1 meter = 3.28084 feet
- 1 inch = 2.54 centimeters
- 1 mile = 1.60934 kilometers
- 1 foot = 0.3048 meters
- 1 kilometer = 0.621371 miles
- 1 yard = 0.9144 meters
Frequently asked questions
How accurate are the conversions?
Very accurate. Every unit is defined relative to the meter using its exact international factor, so conversions are correct to eight significant figures — more than enough for construction, science, and school. The only rounding is in how the result is displayed.
Does this work without an internet connection?
Once the page has loaded, yes. All the calculations happen locally in your browser with no server involved, so conversions keep working even if you go offline.
What is a nautical mile and how is it different from a regular mile?
A nautical mile is used in aviation and maritime navigation and equals exactly 1,852 meters — about 1.15 statute (regular) miles. It corresponds to one minute of latitude, which makes it convenient for navigation.
Can I convert very large or very small numbers?
Yes. The converter handles everything from fractions of a millimeter to thousands of kilometers. Extremely large or small results are shown in scientific notation so they stay readable and precise.
Why does the result show a long decimal?
To preserve accuracy. Many conversions between metric and imperial units don't come out to round numbers, so the tool keeps several significant figures. You can round the answer yourself to whatever precision your task needs.
Which units does it support?
Millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles — covering both the metric and imperial/US systems and the most common everyday and technical lengths.