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Unit Converters Converter
Fixed conversion factors, reviewed October 2026 — exact SI and customary ratios, not a calibrated instrument or legal-for-trade measure.
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1 mph is exactly 1.609344 km/h, so 80 km/h is about 50 mph (49.71). 100 km/h is 27.78 m/s because 1 m/s is exactly 3.6 km/h. Convert the posted number; this is not live GPS.
Convert a posted limit or an exam figure. There is no map, traffic, or speed-camera offset. Average speed over a trip is distance ÷ time on the speed-distance-time page — this converter only changes the unit of a single speed value.
It is not GPS and carries no traffic, signal, or speed-camera offsets — average speed over a trip needs distance ÷ time on the speed-distance-time page, not a unit change.
Static conversion factors — not for precision metrology.
About 62.14 mph (100 ÷ 1.609344). The factor is exact; round the result to whatever the sign or exam asks for.
Instruments apply temperature, calibration, and rounding rules this converter does not. For everyday conversions the factors here are exact; for certification, use calibrated equipment.
Where both exist — such as gallons — the unit list names each, so pick the one you mean.
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