Online Horsepower Calculators

http://www.dragtimes.com/da-density-altitude-calculator.php

this one will give you the weather at any drag strip for the day...and lets you convert your time to a sea level with standard baro and humidity like the dyno does...


more eye candy...

the 71 Dart on 10-4-14 at Famoso Raceway 10.31 @ 127.22 converts to

Stock and Mildly Modified Naturally Aspirated Engines
10.068 @ 130.459 MPH

Extensively Modified Naturally Aspirated Engines
10.16 @ 129.34 MPH