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Kilometres per hour to miles per hour, for driving abroad, reading a speedometer marked in the other system, or making sense of a wind speed or a top-speed figure quoted in metric.
Frequently asked questions
What are common metric speed limits in mph?
30 km/h = 18.6 mph, 50 km/h = 31.1 mph, 80 km/h = 49.7 mph, 100 km/h = 62.1 mph, 120 km/h = 74.6 mph, 130 km/h = 80.8 mph. The 100 km/h ≈ 62 mph anchor is the one worth keeping in your head on a motorway.
What's a quick mental conversion?
Multiply by 6 and drop a digit — 80 km/h → 480 → 48 mph (exact: 49.7). It runs a couple of mph low, which errs in the safe direction when you're the one driving.