Physics

Quarter Mile Calculator

Estimate a car's quarter-mile time and trap speed from power and weight.

Calculated Output

Elapsed time 12.55

Trap speed 108.61

Formula: ET = 5.825·(weight/power)^⅓; trap = 234·(power/weight)^⅓

Step-by-Step Breakdown

1. Values used:

2. Power = 300 hp

3. Weight = 3,000

5. Elapsed time = 12.55

6. Trap speed = 108.61

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The math behind it

ET ≈ 5.825·(weight ÷ power)^⅓ and trap speed ≈ 234·(power ÷ weight)^⅓, with weight in pounds and power in horsepower.

300 hp, 3000 lb → ET ≈ 12.5 s, trap ≈ 108 mph.

How accurate is it?

It's a rough estimate; traction, aerodynamics and gearing all shift the real result.