Engine displacement calculator

Use our engine displacement calculator to calculate an engine's displacement based on the number of cylinders, bore size and stroke length.

Input values


Engine displacement: in3

Understanding the different parameters

Number of cylinders

This is quite simply the number of cylinders your engine has. What more could we say?

Bore size

The bore size is the diameter of each cylinder.

Stroke length

The stroke length is how far the piston travels inside the cylinder.

How to calculate engine displacement

The formula to calculate an engine's displacement can be seen below, this is what we use in the calculator above.

Engine displacement = π(½ × bore size)2 × stroke length × number of cylinders