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Miles to kilometres, for US and UK distances read in metric: road-trip planning, treadmill and fitness-app targets, flight distances, and car specs quoted in one system while you think in the other.
Frequently asked questions
What's a quick mental conversion for miles to km?
Multiply by 1.6, or add 60%: 50 miles → 80 km (exact: 80.47). For more precision, multiply by 8 and divide by 5.
Is converting a speed limit the same as converting a distance?
The factor is identical — 1.609344 — but the rounding convention isn't. Distances get converted precisely, while speed limits are set at round numbers in each system independently: a 30 mph limit is 48.28 km/h, but the equivalent metric limit is signed as 50 km/h rather than 48.