Miles to KM
This free miles to km converter takes the distances written for the mile world — US road signs, race results in 26.2, car range stickers, trail guides — and expresses them in the kilometers your map, watch and legs actually understand.
How to use
- Type a distance in miles into the Value box.
- The equivalent distance in kilometers appears instantly as you type.
- Swap the From and To selects to convert kilometers back to miles.
- Copy the full equation shown under the result into your log or plan.
Frequently asked questions
How many km is 1 mile exactly?
Exactly 1.609344 km. The mile is defined as 1609.344 meters by international agreement, so multiplying miles by 1.609344 is an exact conversion, not an estimate.
What is the formula for miles to kilometers?
km = miles × 1.609344. For example, 26.2 mi × 1.609344 = 42.1648128 km. The reverse direction divides by 1.609344: 10 km ÷ 1.609344 = 6.213711922 mi.
Why is a marathon 26.2 miles?
The marathon distance was set at 42.195 kilometers early in the 20th century; expressed in miles that is 26 miles 385 yards, rounded in everyday speech to 26.2. Convert 26.2 mi here and you get 42.1648128 km — close to, but not identical with, the official 42.195 km.
Do you store the distances I convert?
No. The conversion runs entirely in your browser and nothing is uploaded, stored or logged. Close the page and nothing remains.
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About this tool
This free miles to km converter takes the distances written for the mile world — US road signs, race results in 26.2, car range stickers, trail guides — and expresses them in the kilometers your map, watch and legs actually understand. The conversion uses the exact statutory definition: one mile is exactly 1609.344 meters, so the whole operation is miles × 1.609344, a single multiplication with no approximated factor anywhere. Results appear on every keystroke, and the complete equation is printed below each one, so a number like 26.2 mi = 42.1648128 km can go straight into a training spreadsheet or travel budget. Anchors worth memorizing: 1 mi is 1.609344 km, 5 mi is about 8.05 km, 10 mi is about 16.09 km, and the classic "8 km ≈ 5 mi" runs both ways for quick estimates. That makes speed limits, remaining range and Sunday long-run distances instantly comparable across both systems. Everything is computed locally in your browser as you type — no uploads, no history, no logging — so training routes, trip plans and anything else you paste here never leaves your device. Need the metric-to-mile direction? Swap the From and To selects and this page becomes km to miles in one click.