KM to Miles
This free km to miles converter reads the distances the metric world publishes and translates them for the mile world: road signs, marathon training plans, EV range figures, hiking trail lengths and flight connection distances.
How to use
- Type a distance in kilometers into the Value box.
- The equivalent distance in miles appears instantly as you type.
- Swap the From and To selects to convert miles back to kilometers.
- Copy the full equation shown under the result into your log or plan.
Frequently asked questions
How many miles is 1 kilometer exactly?
A mile is defined as exactly 1609.344 meters, so 1 km = 1 ÷ 1.609344 = 0.6213711922 mi. The factor is the reciprocal of an exact definition, so the only rounding is in how many digits you display.
What is the formula for km to miles?
miles = km ÷ 1.609344. For example, 5 km ÷ 1.609344 = 3.106855961 mi. The reverse direction multiplies by 1.609344: 26.2 mi × 1.609344 = 42.1648128 km.
Is 5 km really 3.1 miles?
5 km is 3.106855961 mi, so "about 3.1 miles" is a good mental estimate for parkrun and training purposes. For official comparisons or pace calculations, use the full precision this tool displays.
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 km to miles converter reads the distances the metric world publishes and translates them for the mile world: road signs, marathon training plans, EV range figures, hiking trail lengths and flight connection distances. The factor is exact, not folk wisdom — since the 1959 international agreement a mile is defined as exactly 1609.344 meters, i.e. 1.609344 km, so the conversion is kilometers ÷ 1.609344 with no approximations along the way. The result updates on every keystroke and the full equation appears underneath, ready to quote in a training log or a travel plan. A useful anchor set for mental math: 5 km is 3.106855961 mi, 10 km is about 6.21 mi, and a marathon is 42.195 km or 26.2 mi. For quick road-trip estimates you can also remember that 8 km ≈ 5 mi, then let this page give you the precise number that Strava, parkrun or an official race results table expects. Like every tool on this site, everything runs locally in your browser: the distances you enter are never uploaded, stored or logged, and nothing about your routes or training leaves your device. To convert in the opposite direction, swap the From and To selects and the page becomes miles to km in one click.