Engine Displacement Calculator
Calculate engine displacement from bore, stroke, and cylinder count — results in cc, litres, and cubic inches.
Engine Displacement Calculator
Bore · Stroke · Cylinders → cc / L / cu in
How It Works
Engine displacement is the total swept volume of all cylinders. The formula uses the circular cross-section area of the bore (π/4 × bore²) multiplied by stroke and cylinder count.
How to Use This Calculator
- Measure or look up the bore diameter in millimetres from engine specs.
- Find the stroke length in mm from the same source.
- Count the number of cylinders (typically 3, 4, 6, 8, or 10).
- Click Calculate — see displacement in cc, litres, and cubic inches.
- Compare to the manufacturer’s quoted displacement to verify your build.
Worked Example
Reference Table
| Engine | Bore (mm) | Stroke (mm) | Cylinders | Displacement |
|---|---|---|---|---|
| Toyota 2JZ-GE | 86.0 | 86.0 | 6 | 2 997 cc |
| Honda K20 | 86.0 | 86.0 | 4 | 1 998 cc |
| Ford Coyote 5.0 | 92.2 | 92.7 | 8 | 4 951 cc |
| GM LS3 6.2 | 103.25 | 92.0 | 8 | 6 162 cc |
| BMW N54 | 84.0 | 89.6 | 6 | 2 979 cc |
| Subaru EJ257 | 99.5 | 79.0 | 4 | 2 458 cc |
| VW 1.8T (EA888) | 82.5 | 92.8 | 4 | 1 984 cc |
Frequently Asked Questions
Why doesn’t my calculated displacement match the manufacturer’s spec?
Manufacturer specs are often rounded. Minor differences in bore or stroke measurement (even 0.1 mm) compound across cylinders. The formula is exact — use the precise values from engine service data.
What is the relationship between displacement and horsepower?
Displacement does not directly determine power. Specific output (hp per litre) varies widely: a naturally-aspirated sports engine may produce 100 hp/L, a turbocharged unit 150 hp/L, while a diesel may produce 60 hp/L.
How does overboring affect displacement?
Boring increases the bore diameter slightly (typically +0.25 to +1.0 mm). Even a 0.5 mm overbore on a 4-cyl 86 mm bore engine adds approximately 25–30 cc of displacement.
Can I calculate displacement for an odd-fire V configuration?
Yes — the formula applies regardless of firing order or engine configuration. All cylinders use the same bore and stroke in a standard production engine, so the multiplication is straightforward.
