Compression Ratio Calculator

Calculate true compression ratio from bore, stroke, combustion chamber volume, head gasket, deck clearance, and piston dome/dish.

Cylinder Bore (mm) Stroke (mm) Number of cylinders

Clearance volume Combustion chamber volume (cc) Head gasket bore (mm) — leave blank to use cylinder bore Head gasket compressed thickness (mm) Piston deck clearance (mm) — piston-to-deck distance at TDC

Piston top Piston top shape