Simple Horsepower Calculator

NOTE! This is just an estimate, and is probably not all that accurate.

This program will give you a ballpark estimate of your horsepower. Please don't make the mistake of quoting these numbers as if they meant anything.

There are two simple horsepower formulas that can estimate the on-the-pavement horsepower for a given car.

The ET method

This method uses the weight of the car and the time it took that car to travel 1330 feet (¼ mile).

The formula is: hp = weight / (ET / 5.825)3


The Trap-speed method

This method uses the weight of the car and the speed at which the car completed the quarter-mile run.

The formula is: hp = weight * (speed / 234)3

Let's try it

Fill in the data below.

How much does your car weigh (with you in it, of course)? lbs
What was your 1/4-mile Elapsed Time (ET)? seconds
What was your 1/4-mile Trap Speed? mph

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