Engine displacement calculator

Calculate engine displacement from circular bore area × stroke × cylinder count.

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Cylinder bore (mm)

Stroke (mm)

More inputs and assumptions

Cylinder count

Answer

…

Calculate engine displacement from circular bore area × stroke × cylinder count.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

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Formula and assumptions

All cylinders are assumed to share one bore and stroke. Millimetres are converted to cubic centimetres and litres. This is swept volume, excluding combustion-chamber clearance.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Engine displacement calculator

Calculate engine displacement from circular bore area × stroke × cylinder count.

All cylinders are assumed to share one bore and stroke. Millimetres are converted to cubic centimetres and litres. This is swept volume, excluding combustion-chamber clearance.

Next: Engine compression ratio calculator

A worked example

Example inputs: cylinder bore (mm) = 100, stroke (mm) = 100, cylinder count = 4. Total swept volume (cm³) = 3141.592653589793.

Before you use the result

All cylinders are assumed to share one bore and stroke. Millimetres are converted to cubic centimetres and litres. This is swept volume, excluding combustion-chamber clearance.

Example results for cylinder bore (mm)

These examples use Stroke (mm): 100; Cylinder count: 4. They are reference calculations, not recommended settings.

Cylinder bore (mm)	Total swept volume (cm³)
50	785.398163397
100	3141.59265359
200	12566.3706144

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