This 1/4 mile calculator uses the rear wheel horsepower instead of flywheel horsepower to determine the times and speed of the run.
| variable | description |
| rear wheel horsepower | horsepower available at the rear wheels |
| weight | total ready to run weight of vehicle including driver |
| elapsed time (ET) | time to run the full length of the quarter mile |
| speed | trap speed at the end of the quarter mile |
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