Engine Displacement Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 26, 2026Engine Displacement Calculator
Displacement is the headline number describing an engine's size - the total volume swept by all pistons across one complete stroke.
The Formula
V = (π/4) × bore² × stroke × cylinders
Worked Example
A 4-cylinder engine with an 86mm bore and 86mm stroke: V = (π/4) × 86² × 86 × 4 ÷ 1000 ≈ 1.998 L - almost exactly a "2.0 liter" engine, one of the most common displacements in production cars.
How to Use This Calculator
- Enter cylinder bore diameter in mm.
- Enter stroke length in mm.
- Enter the number of cylinders.
Related: Mean Piston Speed Calculator, which uses the same stroke value.