Automobile & Vehicle
Compression Ratio Calculator
Lets users compare and budget compression ratio instantly with formula, steps and examples — no manual math.
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cc
cc
Your result
Compression ratio
10.38 : 1
Compression ratio = (375 + 40) ÷ 40 = 10.38:1.
As a number
10.375
About this calculator
Compression ratio = (swept + clearance volume) ÷ clearance volume. Typical petrol engines run 9–12:1 (higher with direct injection), diesels 14–20:1. Higher CR improves efficiency but demands higher-octane fuel.
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