Enter the value
Type any positive or negative number into the value field. Commas are accepted and stripped automatically.
Unit converters
Length Converter (m, cm, ft, in)
Free online length and distance converter
Convert a value
Local processingConverted result
All conversions
Enter a value above to see every unit conversion.
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About this tool
About this tool
Length Converter converts values between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles using fixed SI relationships. You can type a value freely, swap the direction with one click, and see the result plus a complete table of all unit equivalents. Everything runs locally in your browser with no upload.
Convert any measurement between metric and imperial units in either direction. Type a value, choose the source and target units, and every conversion updates instantly, including a full table of the same value in all supported units. Ideal for construction, travel, sewing, shipping, and everyday math.
Built for daily work
- Convert a room dimension from feet to meters before buying furniture.
- Translate a recipe or sewing pattern between inches and centimeters.
- Check shipping dimensions against carrier limits in centimeters or inches.
- Convert walking or driving distances between miles and kilometers.
How to use this tool
How to use this tool
Pick the units
Choose the source unit on the left and the target unit on the right. Use the swap button to reverse the direction.
Read the results
The main result updates as you type, and the table below shows the same value converted into every supported unit.
Key features
Key features
Two-way conversion
Convert from metric to imperial or the reverse without changing pages, with a one-click swap for the opposite direction.
Every unit at once
A full conversion table shows the entered value in all nine units, which is handy for comparing orders of magnitude.
Free numeric input
Type any number, decimal, or negative value. There are no fixed dropdown presets that limit what you can convert.
Instant and local
Results appear with every keystroke and the math runs entirely on your device.
Practical use cases
Practical use cases
- Convert a room dimension from feet to meters before buying furniture.
- Translate a recipe or sewing pattern between inches and centimeters.
- Check shipping dimensions against carrier limits in centimeters or inches.
- Convert walking or driving distances between miles and kilometers.
- Compare nautical mile distances for boating or aviation planning.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
ProcessingLocal browser processing
Supported units9 units in metric, imperial, and nautical systems
InputFree numeric entry, decimals and negatives allowed
Display precisionUp to 8 significant digits
Limitations and important notes
Limitations and important notes
- Extremely large or small values are shown in scientific notation for readability.
- The tool converts length only; area and volume have their own dedicated converters.
- Display rounding never affects the underlying calculation.
Frequently asked questions
Frequently asked questions
The tool uses exact international definitions, for example one inch is exactly 2.54 centimeters and one mile is exactly 1609.344 meters. Results are rounded for display only.
Yes. Negative numbers are accepted and converted correctly, which is useful for temperature-like offsets or direction calculations.
A nautical mile is 1852 meters exactly and is used in maritime and aviation navigation. It is about 1.15 statute miles.
Once the page has loaded, conversions run with plain JavaScript and do not need a connection. No data is sent anywhere at any time.
Related guides and solutions
Related guides and solutions
Convert centimeters to inches and back
One inch is exactly 2.54 centimeters. The [length converter](tool:length-converter) applies that constant instantly in both directions, with a full table so you can compare surrounding units.
Learn moreConvert any unit online in one place
Recipes, packages, workouts, travel, and coursework all need unit conversions. The online [length converter](tool:length-converter) covers nine categories in one place, with instant results and a full conversion table on every page, so you never need to remember a formula.
Learn moreSkip the converter app and convert in your browser
Converter apps take up storage, demand updates, ask for permissions, and often hide features behind accounts. The browser [length converter](tool:length-converter) replaces them: open one URL, type a value, and convert any unit with nothing to install, update, or grant access to.
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