RPM calculator
Gear Ratio Tire Radius MPH
RPM =
CFM needed
Engine size (cid) Max RPM Volumetric Efficiency *
CFM Needed =

* .80 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


Hot Rod Math, Courtesy of Giancarlo Traverso at www.forerunners.com