A body weight?

That calculator is wacky, by a mile!
60 ft, and 1/8th et is horribly slow for the 1/4 mile E.t. it predicts. The example I saw gave a mid eleven second equivalent 60ft, a very high 10 Second equivalent 1/8th, and a low ten 1/4. Fantasy land!
Try Wallace racing calculators. MUCH more accurate, and every kind of calculation you could want.