Engine Displacement Calculator
CID = (π/4) × bore² × stroke × cylinders. Click any i for detail.
Engine
Bore (in)
i
Bore
Cylinder diameter in inches. |
|
|---|---|
Stroke (in)
i
Stroke
Piston travel in inches. |
|
Cylinders
i
Cylinders
Number of cylinders. |
How to use this calculator
- Enter bore and stroke in inches.
- Enter cylinder count.
- Read cubic inches, liters, and cc.
- Horsepower from torque is a different page.
Results explained
Displacement is the swept volume of all cylinders. Liters = CID × 0.016387.
Quick reference: displacement
A 4.00 in bore × 3.48 in stroke V8 is about 349 ci (~5.7 L).
| Item | Detail |
|---|---|
| 1 ci | ≈ 16.387 cc |
| V8 default | 8 cylinders |
| Metric bore mm | Divide mm by 25.4 for inches |
| HP | Horsepower calculator |
Deck clearance and chamber volume are compression-ratio math — not here.
How the estimate is built
CID = (π/4) × bore² × stroke × cyl. L = CID × 0.016387.
Example scenario
4.00 × 3.48 × 8 → about 349 ci (5.72 L).
FAQ
Bore in mm?
Convert to inches first.
Rotary engines?
Not this piston formula.
Overbore 0.030?
Add 0.030 to bore and rerun.