Automotive Calculator

Engine Displacement Calculator

Calculate engine displacement from bore, stroke, and cylinder count for build planning, spec comparison, and workshop checks.

Calculate single-cylinder volume and total engine displacement from bore, stroke, and cylinder count

Bore diameter (inches)Stroke length (inches)Number of cylinders

Cylinder volume

43.731

Cubic inches

716.6

Cubic centimeters

0.7166

Liters

Engine displacement

349.8

Cubic inches

5,733

Cubic centimeters

5.73

Liters

Formula

Volume = π × (bore ÷ 2)² × stroke × cylinders

Reference note

This calculator assumes all cylinders share the same bore and stroke. It is intended for workshop planning, spec comparison, and rules-based displacement checks.

How to use the engine displacement calculator

Enter the cylinder bore diameter in inches using the measurement from your engine spec sheet or workshop notes.

Enter stroke length in inches, then set the total cylinder count for the engine you want to calculate.

Review the single-cylinder volume and full engine displacement in cubic inches, cubic centimeters, and liters.

Engine displacement formula

Engine displacement is the swept volume of one cylinder multiplied by the total number of cylinders.

Cylinder volume = π × (bore ÷ 2)² × stroke
Engine displacement = cylinder volume × cylinders
1 cubic inch = 16.387064 cubic centimeters

Displacement examples

4.000 in bore, 3.480 in stroke, 8 cylinders

About 349.8 CI

A familiar small-block V8 reference point.

4.125 in bore, 4.000 in stroke, 8 cylinders

About 427.6 CI

Useful when comparing stroker combinations.

Build planning notes

Use the finished bore size, not just the nominal block family size.
Small bore or stroke changes can move the final displacement enough to matter for class rules.
This calculation assumes every cylinder uses the same bore and stroke.

Helpful when bore and stroke need a real displacement number

Useful for builds, swaps, and spec checks

Good when you want to compare engine combinations or verify that a bore and stroke setup lands where you expect.

Easy to compare nearby combinations

Adjust bore, stroke, or cylinder count and see the displacement values refresh immediately.

Works from the standard cylinder-volume formula

Calculates single-cylinder volume and total displacement for workshop reference, build planning, and class-based checks.

Quick in the garage or on the go

Useful while comparing rotating assemblies, reading spec sheets, or checking build notes from your phone or desktop.

Editorial and accuracy note

Engine Displacement Calculator combines a working converter with practical guidance on the same page. The page is designed to show the formula, examples, rounding notes, and related tools so visitors can judge whether the result fits a task such as shipping, recipes, logs, design, travel, or automotive planning.

Results are calculated in the browser with standard conversion factors for common units.
For official forms, engineering tolerances, medical decisions, or compliance work, verify the original measurement and the relevant source rule.
The surrounding notes focus on real use cases instead of repeating generic placeholder copy.

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Engine displacement calculator FAQ

How accurate are the engine displacement calculations?

The calculator uses the standard cylinder-volume formula based on bore, stroke, and cylinder count, which works well for engine building, comparison, and workshop reference.

What is the difference between bore and stroke?

Bore is the cylinder diameter, while stroke is the distance the piston travels. Together with cylinder count, they determine total engine displacement.

Can I use this engine displacement calculator on mobile?

Yes. The page works well on phones, tablets, and desktop screens.

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