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Dyno Correction Calculator


Enter Dyno Run Conditions

Temperature: ║Fahrenheit

Barometric Pressure: inHg  (inches of Mercury)

Relative Humidity: %

Uncorrected Dyno Horsepower:


>><< Click to Calculate

Vapor Pressure = inHg

SAE  Air Correction Factor =   J1349 AUG2004

     SAE Corrected Wheel Horsepower =

     Estimated SAE Corrected Flywheel Horsepower =

Motorsports Standard Atmosphere Correction Factor =

     MSA Corrected Wheel Horsepower =

     Estimated MSA Corrected Flywheel Horsepower =

STD Air Correction Factor =

     STD Corrected Wheel Horsepower =

     Estimated STD Corrected Flywheel Horsepower =


This calculator converts your dyno run into corrected SAE, MSA and STD horsepower. These correction factors are used by dyno shops to correct for nonstandard temperature, barometric pressure and humidity. The Flywheel HP estimate assumes a 14% driveline loss.
SAE J1349 standard day is 77F, 29.23inHg (inches of Mercury) pressure, 0% Relative Humidity.
Motorsports Standard Atmosphere (MSA) is 60F, 29.92 and 0% humidity.
STD standard day is 68F, 29.92 and 0% humidity.
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