Quarter Mile Calculator

Your details

Three empirical fits to real drag-strip data. Fox is a common middle ground.
Race weight including driver and fuel.
lb
Engine power for the prediction. Choose crank or wheel below.
hp
Wheel power is converted to crank power using an assumed driveline loss, since the equations were fitted to crank figures.
Predicted ETHot hatch / sport sedan (13-15 s)
13.51s
Trap speed106.8mph
Eighth-mile ET8.59s
60-foot time (est.)1.88s
Crank horsepower300hp
Power-to-weight200hp/ton
Power-to-weight (metric)164.4W/kg
13.51 s
Supercar<10Very quick10-13Sporty13-15Everyday15-18Slow18+

Predicted run: 13.51 s at 106.8 mph (Fox).

  • Predicted run: 13.51 s at 106.8 mph, with about 8.59 s through the eighth mile.
  • ET and trap speed are set by the power-to-weight ratio, not horsepower alone, and both use a cube root.
  • This is an idealized estimate assuming clean traction and shifts; tires, launch, gearing, aero and air density move real times around.

Next stepSwitch to the reverse mode to check the figure against a real time slip, or compare the Fox, Hale and Huntington fits.

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