Compression Ratio Calculator

Compression ratio can be defined as the ratio of maximum cylinder volume when the piston is at BDC to the minimum cylinder volume when the piston is at TDC. Calculating compression ratio is vital to check engine's efficiency. Normally the petrol engines possess a compression ratio anywhere from 7:1 to 10:1 whereas diesel engines possess 14:1 to 24:1. We can calculate compression ratio of an engine using this below mentioned formula:

Compression Ratio Formula

Enter the required values in the below calculator and click calculate button to find the answer.

Cylinder Diameter: [in]
Stroke Length: [in]
Head Gasket Thickness: [in]
Deck Height: [in]
Piston Top Volume: [cc]
Combustion Chamber: [cc]
Compression Ratio:

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