Use this calculator to correct your timeslips to a standard correction. This calculator is based on the SAE J1349 relative horsepower calculation. Standard conditions are: Air temp 77 °F, 29.235 Inches - Hg pressure, and 0% relative humidity.

The density of air changes which in turn affects the HP generated by an internal combustion engine. SAE came up with a formula to correct HP numbers based on the air density. Use this calculator to correct your timeslips. After correcting your timeslips to standard conditions you can more accurately compare the results between timeslips.

The inputs to this calculator are air temperature which is the ambient air temperature, in °F. The station pressure which is the ambient air pressure, in Inches Hg. The relative humidity is percentage of moisture in the air to the amount it could hold at saturation, in %. All measured at the time of the run.