This calculator provides an evaluation of adding horsepower vs reducing weight with the change in quarter mile times as the basis for the solution. Which will go quicker?
| variable | description |
| flywheel horsepower | the current horsepower at the flywheel |
| weight | the current weight of the vehicle and driver, ready to run |
| increase in horsepower | the proposed increase in horsepower |
| decrease in weight | the proposed decrease in weight |
| current | et and mph for the current combination |
| increase horsepower | et and mph for the increase in horsepower |
| decrease weight | et and mph for the decrease in weight |
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