Piston Displacement Calculator

Quickly calculate the displacement of an engine or cylinder using bore, stroke, and cylinder count — essential for engine performance analysis.

Select your preferred measurement system
Enter total cylinders in engine (1-16)
Diameter of the cylinder
Piston travel from TDC to BDC
Formula Used

The displacement is calculated using this formula:

V = π × (Bore/2)² × Stroke × Number of Cylinders

Where:

  • Bore and Stroke must be in the same unit
  • Result is shown in cm³ or in³ depending on unit selected

How to Use the Piston Displacement Calculator

  1. Select your measurement unit (Metric or Imperial).
  2. Enter the bore (cylinder diameter).
  3. Enter the stroke (piston movement range).
  4. Specify the number of cylinders.
  5. The tool will automatically calculate:
    • Displacement per cylinder
    • Total engine displacement
Tips for Accurate Input
  • Always double-check your unit system (mm vs inch)
  • Bore is diameter not radius
  • Stroke is measured from TDC (Top Dead Center) to BDC (Bottom Dead Center)

Engine Reference Data

Engine Type Common Bore (mm) Common Stroke (mm) Cylinders
Small Scooter 50 50 1
Motorcycle (250cc) 70 64 1-2
Car (1500cc) 75 85 4
Sports Car 90 85 6-8
Truck 110 130 6
Interactive Guide

Choose between Metric (millimeters and cubic centimeters) or Imperial (inches and cubic inches) units.

Input the bore (cylinder diameter), stroke length (piston travel distance), and number of cylinders.

The calculator will display displacement per cylinder and total engine displacement. You can also visualize the results with a chart.
What is Piston Displacement?

Piston displacement, also called engine displacement or swept volume, is the total volume of all the cylinders in an internal combustion engine. It's a key measurement of engine size and potential power output.

Displacement is typically measured in cubic centimeters (cc) or liters (L) for metric units, or cubic inches (ci) for imperial units.

Performance Factors

While displacement is important, engine performance also depends on:

  • Compression ratio
  • Air intake design
  • Fuel delivery system
  • Exhaust flow
  • Engine tuning