Bore To Stroke Calculator
Calculate engine displacement from bore and stroke dimensions. Enter bore diameter and stroke length to get displacement in cubic centimeters (cc) or cubic inches (ci).
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator computes the total engine displacement (in cc, liters, or cubic inches) from bore, stroke, and cylinder count.
- Enter Bore Diameter – The cylinder bore (width) in millimeters or inches.
- Enter Stroke Length – The piston stroke (travel distance) in the same unit as bore.
- Set Number of Cylinders – Default is 1; adjust as needed (minimum 1).
- Choose Unit – Select Millimeters (mm) for metric or Inches (in) for imperial.
- Click "Calculate" – The result shows displacement in cc (or ci) and liters, plus the formula breakdown.
Tip: All inputs must be positive numbers. Errors will highlight invalid fields.
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Frequently Asked Questions
Bore is the diameter of the cylinder, stroke is the distance the piston travels. The ratio affects engine characteristics like torque and horsepower.
Displacement = π × (bore/2)² × stroke × number of cylinders. Ensure units are consistent.
Yes, select the unit from the dropdown. The calculator converts automatically.