Automotive
Static compression ratio
Calculate a geometric static compression ratio from measured volumes.
Calculators / Automotive / Engine displacement
Engine displacement calculator
Calculate swept displacement for equal circular cylinders.
On this page
One cylinder swept volume499.56cm³
Engine displacement1,998.23cm³
Engine displacement2litres
Calculator controls
How to calculate
Calculate swept displacement for equal circular cylinders.
Swept volume = π × bore² × stroke ÷ 4; divide mm³ by 1000 for cm³, then multiply by cylinder count.
Worked example
Cylinder bore (mm): 86; Piston stroke (mm): 86; Number of cylinders: 4.
One cylinder swept volume: 499.56 cm³; Engine displacement: 1,998.23 cm³; Engine displacement: 2 litres.
Assumptions and limits
Calculate swept displacement for equal circular cylinders. This is geometric volume, not power; it excludes clearance volume and does not apply to rotary engines.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Calculate swept displacement for equal circular cylinders. This is geometric volume, not power; it excludes clearance volume and does not apply to rotary engines.
When this tool is useful
Swept volume = π × bore² × stroke ÷ 4; divide mm³ by 1000 for cm³, then multiply by cylinder count.
Understanding your inputs
| Input | What to enter |
|---|---|
| Cylinder bore (mm) | Enter a number of at least 0.001 and no more than 1000. |
| Piston stroke (mm) | Enter a number of at least 0.001 and no more than 1000. |
| Number of cylinders | Enter a number of at least 1 and no more than 32. |
Frequently asked questions
Does engine displacement tell me how much power the engine makes?
No. Displacement is the combined swept volume of the cylinders. Power also depends on airflow, combustion, speed and design, so engines with the same displacement can have different outputs.