Compression Calculator Online

Compression Calculator

To use our compression calculator fill in either SAE or Metric values by double clicking on "number".
Then click on to Calculate Compression.

Cylinder Diameter (inches ex: 4.25)			Cylinder Diameter (mm)
Stroke Length (inches ex: 4.25)			Stroke Length (mm)
Number of cylinders (4, 5, 6, 8)			Number of cylinders
Chamber in cc's (ex: 119)			Chamber in cc's
Piston dome in cc's (Dome = positive #, Flat = 0, dished = negative number) ex: 22			Piston dome in cc's
Gasket Thickness in inches (add plus or minus amount piston is in the hole) ex: .041			Gasket Thickness in mm (add plus or minus amount piston is in the hole)

The displacement is cubic inches or liters.
You also have a Compression ratio of :1

With our Online Compression Claculator you can calculate your Static Compression Ratio and determine if it will work with your Fuel/Octane and Cam/Car Combo.
Ideal Compression ratios for the street are around 9:1 compression ratio with pump gas and a moderate performance cam and as high as 10:1 compression ratio with a more strip freindly cam. As Cams progress into race categories and combined with aluminum heads compression ratios with pump gas may be as high as 11.5:1 in rare circumstances.
Thanks for using our Compression Calculator! Return Home

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