Engine Displacement Calculator
Displacement from bore, stroke, and cylinders.
Inputs
Results
Displacement (liters)
2
Displacement (cc)1,998.2
Displacement (cubic inches)121.9
Single cylinder volume (cc)499.6
Bore/stroke ratio1
Approx. NA horsepower133
How to Use This Calculator
- Enter Bore diameter, Stroke length, and Number of cylinders.
- Set Input units, Millimeters, and Inches.
- Review the Displacement (liters) result.
- Use Displacement (cc) and Displacement (cubic inches) to inform your decision.
How the result changes with Bore diameter
| Bore diameter | Displacement (liters) |
|---|---|
| 20 | 0.11 |
| 70 | 1.32 |
| 130 | 4.57 |
| 180 | 8.75 |
What each input means
- Bore diameter
- Cylinder bore diameter. Default in mm; set units to 1 for inches.
- Stroke length
- Piston stroke length in same units as bore.
- Number of cylinders
- Total cylinder count (e.g., 4, 6, 8).
- Input units
- Select the input units
What each result means
- Displacement (liters)
- Total engine displacement in liters.
- Displacement (cc)
- Total engine displacement in cubic centimeters.
- Displacement (cubic inches)
- Total engine displacement in cubic inches.
- Single cylinder volume (cc)
- Volume of one cylinder.
- Bore/stroke ratio
- >1 = oversquare (rev-happy), <1 = undersquare (torque-oriented), 1 = square.
- Approx. NA horsepower
- Rough naturally-aspirated HP estimate (~1 HP per 15cc). Actual varies with design.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersBore diameter = 86, Stroke length = 86, Number of cylinders = 4, Input units = 0 = 4 input(s) provided
- Calculate DisplacementDisplacement = totalDisplacementCC / 10002 = 2
- Calculate DisplacementDisplacement = singleCylinderCC * cylinders1998.2 = 1998.2
- Calculate DisplacementDisplacement = totalDisplacementCC / 16.387121.9 = 121.9
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Auto Performance
Compression Ratio Calculator
Static CR from bore, stroke, and chamber volume.
Auto RepairCatalytic Converter Cost Calculator
Replacement cost by vehicle class.
Auto RepairBrake Job Cost Calculator
Brake service cost from scope and vehicle class.
Auto RepairRepair vs Replace Decision Calculator
ROI of repair vs replacement.
More in Automotive & Motorcycles.