Kph to Mph
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km/h to mph in Depth
Multiply by 0.621371 — or roughly 5/8. The conversion is exact because the mile is defined as 1.609344 km; there is no measurement uncertainty hiding in it.
The Driver's Cheat Sheet
Memorize the ladder: 50 km/h ≈ 31 mph, 80 ≈ 50, 100 ≈ 62, 120 ≈ 75. Rental-car Americans in Europe: your familiar "70 mph cruise" is 113 km/h — over the limit on most motorways. Europeans in the US: 65 mph is only 105 km/h, slower than you expect.
Why Both Survive
Aviation and shipping went metric-ish (knots, km), but road signs follow national inertia. Until that changes, this conversion stays a travel essential.