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Hot Rod Math


Page courtesy of ScottSS
Please read disclaimer in source.




Estimates horsepower based on vehicle weight and best ET.
Vehicle Weight
(in lbs. with driver)
Best Quarter Mile E.T. (seconds)

RPM calculator

Gear Ratio Tire Radius MPH
RPM =

CFM needed

Engine size (cid) Max RPM Volumetric Efficiency *
CFM Needed =

* 1.0 is a good estimate for a mild performance engine

Horsepower From MPH Calculation:

1/4 Mile
Speed (mph)
Vehicle
Weight (lbs.)
  Horsepower

Liter/CID Conversions:

Liters Cubic Inches

Displacement Calculation:

Bore Stroke # of Cylinders
CID=

Miles per Gallon:

Miles
Travelled
Gallons
Used
  Miles Per Gallon

Kilometers per Liter:

Kilometers
Travelled
Liters
Used
  Kms Per Liter




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