Bore And Stroke Calculator
Calculate engine displacement, bore, stroke, and number of cylinders. Enter any three values to compute the fourth.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator computes any missing value among Bore, Stroke, Cylinders, and Displacement for an engine. All values are in metric units (mm for bore/stroke, cc for displacement).
- Enter exactly three values — leave the field you want to calculate empty.
- Input format: Use positive numbers. Cylinders must be a whole number (integer).
- Click "Calculate" — the missing value appears instantly with the formula used.
- Result shows the calculated value and the mathematical formula applied.
- To recalculate, clear one field, adjust inputs, and calculate again.
Tip: If you get an error, ensure you filled exactly three fields with valid positive numbers.
Previous Results
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Frequently Asked Questions
Engine displacement (in cc) = (π/4) × bore² (mm) × stroke (mm) × number of cylinders / 1000.
Yes. Bore = sqrt( (displacement × 1000) / (π/4 × stroke × cylinders) ).
Bore and stroke are in millimeters, displacement in cubic centimeters (cc).