Engine Displacement Calculator
Bore, stroke and cylinders to cc, litres and cubic inches.
Enter your values
Enter the bore in mm.
Enter the stroke in mm.
Enter the number of cylinders you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Total displacement
- 1998.2 cc
- In litres
- 2 L
- In cubic inches
- 121.9 cu in
- Per cylinder
- 499.6 cc
- Bore/stroke character
- Square
Quick answer
Displacement is the swept volume of one cylinder — π ÷ 4 × bore² × stroke — multiplied by the number of cylinders.
V = (π/4) × bore² × stroke × cylinders
At a glance
| What it does | Bore, stroke and cylinders to cc, litres and cubic inches. |
|---|---|
| Category | Auto |
| Inputs needed | Bore, Stroke, Number of cylinders |
| Main output | Total displacement |
| Formula | V = (π/4) × bore² × stroke × cylinders |
| Cost | Free — no sign-up, no download |
How to use the Engine Displacement Calculator
- 1Enter bore diameter in millimetres.
- 2Enter stroke length in millimetres.
- 3Enter how many cylinders the engine has.
Inputs explained
- Bore(mm)
- Enter the bore in mm.
- Stroke(mm)
- Enter the stroke in mm.
- Number of cylinders
- Enter the number of cylinders you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Bore86 mm
- Stroke86 mm
- Number of cylinders4
Results
- Total displacement1998.2 cc
- In litres2 L
- In cubic inches121.9 cu in
- Per cylinder499.6 cc
- Bore/stroke characterSquare
Frequently asked questions
What is an oversquare engine?
One where the bore is wider than the stroke. Shorter strokes mean lower piston speed, so oversquare engines rev higher; undersquare engines make torque lower down.
Does boring an engine add much?
A 0.5 mm overbore on a 2.0 L four adds roughly 25 cc — small, but it also raises compression slightly unless the head is adjusted.
What do I need to enter into the Engine Displacement Calculator?
Just 3 values: bore, stroke, number of cylinders. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Engine Displacement Calculator work out the answer?
Displacement is the swept volume of one cylinder — π ÷ 4 × bore² × stroke — multiplied by the number of cylinders. It applies the formula V = (π/4) × bore² × stroke × cylinders and shows the working so you can check each step by hand.
Is the Engine Displacement Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.