Speed Converter

Convert mph, km/h, m/s, and ft/s for trap speed and indicated cruise.
PowerPressureDisplacementTorque unitsLengthWeightVolumeSpeedTemperature

Trap speed, cruise, speedo checks

Formula

multiply the speed value by 1.60934

Full speed board

Same input, every speed unit — tap a tile to set the right-hand unit.

MPH to km/h for trap speed and cruise

  • 1 mph = 1.609344 km/h exactly. 60 mph is 96.6 km/h; 100 km/h is 62.1 mph.
  • US trap speeds and speedos are mph; most of the world and many GPS logs are km/h.
  • This does not correct a speedometer after a tire swap — that is a different calculator.

Speed units split every timeslip and road-trip log. A 110 mph trap is 177 km/h; a 130 km/h Autobahn indicated is 80.8 mph. This converter also shows meters per second and feet per second for the occasional sensor or data-trace that is not in highway units.

Indicated speed and true speed are not the same after a tire or gear change. Convert the number on the cluster here, then use the speedometer calibration calculator if the cluster is lying. RPM at a given speed needs tire diameter and gearing — the RPM-at-speed calculator.

Do not treat a converted trap speed as an ET predictor. Quarter-mile math lives on its own page.

Common speed conversions

Cruise, trap, and a metric limit.

MPH and km/h
You haveEqualsAlso
60 mph96.6 km/h88.0 ft/s
70 mph113 km/h103 ft/s
100 km/h62.1 mph91.3 ft/s
110 mph trap177 km/h161 ft/s
130 km/h80.8 mph—
1 mph = 1.609344 km/h. 1 m/s = 3.6 km/h. 1 mph ≈ 1.467 ft/s.

When this is the wrong tool

True vs indicated speed after a tire or diff change is the speedometer calibration calculator. Engine RPM at that speed is RPM-at-speed. ET from trap speed is not a unit conversion.

How to convert mph to km/h

  1. Enter the speed. Cluster, GPS, or timeslip.
  2. Set mph or km/h. Match the source. m/s and ft/s are on the board for traces.
  3. Read the other unit. Tap a tile to move that unit to the right-hand card.

Speed converter FAQ

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