Calculators
Page courtesy of ScottSS
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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