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Kilometres to miles, for road signs and odometers abroad, race distances, and flight or route distances quoted in metric. Runners hit this one constantly, since race distances are metric by convention and most training talk in the US and UK is in miles.
Frequently asked questions
What's a quick mental conversion for km to miles?
Multiply by 5 and divide by 8 — 80 km → 400 ÷ 8 = 50 miles (exact: 49.71). The Fibonacci trick also works surprisingly well: consecutive Fibonacci numbers approximate the ratio, so 8 km ≈ 5 miles, 13 km ≈ 8 miles, 21 km ≈ 13 miles.
How many miles is a 5K, 10K or marathon?
A 5K is 3.107 miles, a 10K is 6.214, a half marathon (21.0975 km) is 13.109, and a full marathon (42.195 km) is 26.219 miles — which is where the "26.2" on the bumper stickers comes from.