Simple Racing Calculators

These calculators require a Java capable browser

Estimate your horsepower by trap speed

Enter vehicle weight in pounds (with driver)

 lbs

Enter trap speed (1/4 mile m.p.h.)

 m.p.h.

    

You have   HP at the rear wheels    HP at the crank *
*  with an18% friction loss.

Estimate your horsepower by ET

Enter vehicle weight in pounds (with driver)

 lbs

Enter ET in seconds (1/4 mile)

 sec

    

You have   HP at the rear wheels    HP at the crank  *
*  with an18% friction loss.

Estimate your speed at a given RPM

Enter tire diameter
Enter final gear ratio


    

This estimate is based on a 1:1 final drive ratio
1000 rpm   mph 5000 rpm   mph
1500 rpm   mph 5500 rpm   mph
2000 rpm   mph 6000 rpm   mph
2500 rpm   mph 6500 rpm   mph
3000 rpm   mph 7000 rpm   mph
3500 rpm   mph 7500 rpm   mph
4000 rpm   mph 8000 rpm   mph
4500 rpm   mph 8500 rpm   mph
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