Learn more about our free tool designed to help mechanics, engineers, students, and car enthusiasts understand engine displacement.
Our engine displacement calculator helps you quickly determine the size of an engine by entering the bore diameter, stroke length, and number of cylinders. The tool instantly calculates the engine displacement and shows results in multiple units.
This calculator is useful for mechanics, automotive engineers, students, and car enthusiasts who want to understand engine size or design.
Engine displacement is the total volume swept by all pistons inside the cylinders of an engine as they move from the top position to the bottom position.
Every piston moves up and down inside a cylinder. The space that the piston travels through is called the displacement volume. When you combine the volume of all cylinders in an engine, you get the total engine displacement.
Engine displacement is often used to describe engine size and gives a rough idea of the engine's power capability.
Engine displacement is calculated using the following formula:
Displacement = π × (Bore² ÷ 4) × Stroke × Number of Cylinders
This formula is derived from the volume formula of a cylinder. First, the volume of one cylinder is calculated. Then that value is multiplied by the number of cylinders to get the total engine displacement.
You can calculate engine displacement manually by following these steps.
The bore is the diameter of the cylinder. It is usually measured in millimeters or inches.
The stroke is the distance the piston travels from the top dead center (TDC) to the bottom dead center (BDC).
Determine how many cylinders the engine has. Most vehicles have:
Insert the values into the displacement formula.
The result can be expressed in cc, liters, or cubic inches depending on the unit used.
Using our calculator removes the need for manual calculations and gives results instantly.
Use our engine displacement calculator to determine engine size instantly.
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