A simple javascript calculator that I've found helpful.

I don't remember where I swiped this one from, but whoever you are, thanks.

Engine Item MM Inches Measurement
Engine Bore
Engine Stroke

Deck Height * Add "-" for piston above deck surface

Total Combustion Chamber Volume CC's

Your Compression Ratio is
Number of cylinders
Your Displacement is :
Solve for which variable ?
mm to inch conversion
mm inch fraction

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