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0-60 mph Time Calculator

Estimate your car's 0-60 mph time from hp and weight.

Result

5.51 s
13.08 s

How it is calculated

You enter engine power in horsepower (hp) and vehicle weight in pounds (lb). For 0-60 mph the tool converts them to kilograms and watts and uses a constant-power model:

t = m × v² ÷ (2 × 0.45 × P)

with v = 60 mph (26.82 m/s). The factor 0.45 lumps together drivetrain losses, gear changes and time below peak rpm; the result is never quicker than a 1.3 g traction limit (about 2.1 s). The second line is Patrick Hale's quarter-mile formula, ET = 5.825 × (W ÷ P)1/3, with W in lb and P in hp. Both values must be greater than zero, otherwise no result is shown, and results are rounded to two decimals. Neither model knows about traction aids, gearing, tyres, launch technique or the instant torque of electric motors.

Worked example

A car with 300 hp weighing 3400 lb:

  1. Mass: 3400 lb × 0.4536 ≈ 1542 kg; power: 300 hp × 745.7 ≈ 223,710 W; 60 mph = 26.82 m/s.
  2. 0-60: 1542 × 26.82² ÷ (2 × 0.45 × 223,710) ≈ 1,109,500 ÷ 201,340 ≈ 5.51 s.
  3. Quarter mile: 3400 ÷ 300 ≈ 11.33 lb per hp; cube root ≈ 2.246; × 5.825 ≈ 13.08 s.

Double the power to 600 hp and the 0-60 estimate halves to about 2.76 s, while the quarter-mile time only drops to about 10.4 s, because of the cube root.

Try this example →

Common mistakes

  • Typing the weight in kilograms or the power in kW or PS. The tool expects pounds and hp and does no conversion, so a 1500 kg car entered as 1500 comes out far too quick.
  • Reading the quarter-mile figure as a 0-60 time. Hale's 5.825 formula estimates the elapsed time over a quarter mile, which is roughly twice the 0-60 time.
  • Expecting the result to match an electric car. Electric motors give full torque from standstill, so real EV times are often quicker than this petrol-car model suggests.
  • Treating the estimate as exact. Road-test times vary with tyres, weather, gearbox and launch technique, so a 10% difference is normal.

About this calculator

This calculator estimates the 0-60 mph time from engine power and vehicle weight with a constant-power model: t = m × v² ÷ (2 × η × P), where m is the mass, v is 60 mph and P is the engine's peak power. The efficiency factor η = 0.45 stands for everything that keeps a real car from using its full peak power all the way: drivetrain losses, gear changes and the time spent below peak rpm. With it the estimate lands within roughly 10% of road-test figures for typical petrol cars, and it is never quicker than a 1.3 g traction limit (about 2.1 seconds).

It also shows Patrick Hale's empirical quarter-mile formula, ET = 5.825 × (weight/power)^(1/3), with weight in pounds and power in horsepower, which drag racers use to estimate elapsed time over a quarter mile from the weight-to-power ratio.

Car enthusiasts, automotive journalists and tuners use these figures as a quick sanity check on claimed acceleration or to judge the effect of a weight reduction or a power upgrade — neither model captures traction beyond the simple 1.3 g floor on the 0-60 time, nor gearing, launch control or the instant torque of electric cars, so treat the results as estimates.

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Comments (1)

  • Editorial team

    Both estimates here depend only on the weight-to-power ratio, so a weight cut and a power gain are directly interchangeable. Taking 340 lb out of a 3,400 lb, 300 hp car gives 4.96 s, exactly what 3,400 lb with 333 hp gives, so shedding 10 percent of weight is worth about 11 percent more power. Enter the weight with driver and fuel aboard, since that is what accelerates. Which is cheaper for your car, lighter parts or more power?

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