Tools / Converters

Length Converter

From millimeters to miles, including traditional Korean units — convert instantly.

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Tool info

Category Converters

Processing Directly in your browser

Data storage Not stored

Updated 2026-08-30

How to use

Enter the value you want to convert.

Pick the source and target units to see the result instantly.

Tap the ⇄ button to swap the source and target units.

FAQ

자주 묻는 질문

Q1. Which length units can I convert?

Metric units like millimeters, centimeters, meters, and kilometers, imperial units like inches, feet, yards, and miles, and traditional Korean units like ri and ja.

Q2. Are traditional Korean units like ri or ja supported?

Yes. Ri (about 392.727m) and ja (about 0.303m) are included, useful for reading old records or real-estate documents.

Q3. How do I convert inches to centimeters precisely?

Pick inch (in) as the source unit and centimeter (cm) as the target — the result uses the exact 1 inch = 2.54cm ratio.

Q4. How many decimal places are shown?

Results are shown with up to 6 decimal places. Very small discrepancies can come from rounding.

Q5. Is my input sent to a server?

No. All calculations happen entirely in your browser and are never sent to or stored on a server.

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