Free displacement calculator

Engine displacement calculator cubic inches, cc and liters

Type the bore, stroke and number of cylinders to get displacement in cubic inches, cubic centimeters and liters, plus the volume per cylinder and the bore-to-stroke ratio.

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Bore and stroke are in
Examples to try

Use the actual bore after machining (a .030 in overbore adds 0.030 in to the bore). Examples only, not specs for any engine.

Engine displacement-
-

Cubic centimeters-
Liters-
Per cylinder-
Bore ÷ stroke-

In short

Engine displacement = π ÷ 4 × bore² × stroke × number of cylinders. With a 4.00-inch bore, a 3.48-inch stroke and eight cylinders, that's 0.7854 × 16 × 3.48 × 8 = 349.8 cubic inches. One cubic inch is exactly 16.387064 cc, so it's 5,733 cc or 5.73 liters. In millimeters, divide the result in mm³ by 1,000 for cc.

How it works

How to use the Engine Displacement Calculator

1

Pick inches or millimeters

Use the unit your bore and stroke are in.

2

Enter bore, stroke and cylinders

The actual bore after any overbore, the crank stroke, and 1 to 16 cylinders.

3

Read the displacement

Total in cubic inches, cc and liters, the volume per cylinder and the bore-to-stroke ratio.

What it does

What the engine displacement calculator works out

Three units at once

Cubic inches, cubic centimeters and liters.

Inches or millimeters

Enter bore and stroke in either unit.

Per cylinder

The swept volume of one cylinder, the figure you need for a compression ratio.

Overbore check

Try a .030 or .040 overbore to see the new displacement.

Unit warnings

Flags a bore that looks like it's in the other unit.

Displacement
π ÷ 4 × bore² × stroke × cylinders
Units
1 in³ = 16.387064 cc exactly (1 in = 2.54 cm); 1 liter = 1,000 cc
Metric input
mm³ ÷ 1,000 = cc
Bore ÷ stroke
above 1 is oversquare, below 1 undersquare
FAQ

Questions about the engine displacement calculator

How do you calculate engine displacement?
Multiply π ÷ 4 (0.7854) by the bore squared, the stroke and the number of cylinders. 0.7854 × 4.00² × 3.48 × 8 = 349.8 cubic inches.
How do I convert cubic inches to liters?
Multiply cubic inches by 16.387064 to get cc, then divide by 1,000 for liters. 350 cubic inches is 5,735 cc, or 5.7 liters.
How much displacement does an overbore add?
Use the new bore in the formula. A 4.00 × 3.48 inch V8 bored .030 over (4.030 in) goes from 349.8 to 355.1 cubic inches.
What does oversquare mean?
The bore is larger than the stroke (a ratio above 1). Undersquare means a stroke longer than the bore, and square means they're equal.
Why does the published size differ slightly from my result?
Makers round displacement to a marketing figure, such as 5.7 L, and the exact bore and stroke may differ from rounded specs. Use measured dimensions for an exact number.
Keep going

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Sources

Where the formulas and rules come from

Checked October 2026. The formula and the cubic-inch conversion are exact; results are only as exact as the measurements.

Link to this tool

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