Displacement Engine Calculator
Displacement engine calculator works out Total displacement (in the cube of the chosen unit) and Displacement from Bore (cylinder diameter), Stroke and Number of cylinders. The default figures on this page give displacement of 1,998.23 cm3; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- One cylinder sweeps pi/4 x 86^2 x 86 = 499557.2142 cubic mm.
- Times 4 cylinders = 1998228.8569 cubic mm = 1998.23 cc = 1.998 L = 121.94 cu in.
- Bore/stroke = 1, i.e. square.
- No chamber volume given, so the compression ratio is not reported.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the displacement engine calculator calculates
Computes engine displacement from bore, stroke and cylinder count, reporting it in cc, litres and cubic inches, plus the swept volume of one cylinder and the compression ratio when the chamber volume is known.
How to use this displacement engine calculator
Enter Bore (cylinder diameter), Stroke, Number of cylinders and Unit for bore and stroke. Total displacement (in the cube of the chosen unit) updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Total displacement (in the cube of the chosen unit), Displacement and Swept volume of one cylinder (chosen unit cubed).
The method follows FAA Aviation Maintenance Technician Handbook - General (FAA-H-8083-30B), piston displacement, Researched engineering contract R119 (ENGINE-DISPLACEMENT) and NIST Special Publication 811 (1 in = 25.4 mm exactly, so 1 cu in = 16.387064 cc).
Research fixture R119-GT-1: bore 4, stroke 3, 8 cylinders example
With Bore (cylinder diameter): 4, Stroke: 3, Number of cylinders: 8, the calculator returns Total displacement (in the cube of the chosen unit): 301.592895. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Total displacement (in the cube of the chosen unit), Displacement and Swept volume of one cylinder (chosen unit cubed). The inputs you can vary are Bore (cylinder diameter), Stroke, Number of cylinders, Unit for bore and stroke and Combustion chamber (clearance) volume.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I calculate engine displacement?
Computes engine displacement from bore, stroke and cylinder count, reporting it in cc, litres and cubic inches, plus the swept volume of one cylinder and the compression ratio when the chamber volume is known. Open “How this is worked out” beside the result to see each step for your own figures.
What is a 5.0 L engine converted to cubic inch displacement?
Computes engine displacement from bore, stroke and cylinder count, reporting it in cc, litres and cubic inches, plus the swept volume of one cylinder and the compression ratio when the chamber volume is known. On this page it is computed from Bore (cylinder diameter), Stroke and Number of cylinders and shown as Total displacement (in the cube of the chosen unit), Displacement and Swept volume of one cylinder (chosen unit cubed).
What is the typical displacement of a V8 engine?
On the figures this page opens with — bore (cylinder diameter) 4 and stroke 3 — the displacement is 1,998.23 cm3. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
How to calculate cc of engine?
It needs Bore (cylinder diameter), Stroke, Number of cylinders, Unit for bore and stroke and Combustion chamber (clearance) volume. Nothing else is required, and the figures stay in your browser.
What information do I need for the displacement engine calculator?
You need Bore (cylinder diameter), Stroke, Number of cylinders, Unit for bore and stroke and Combustion chamber (clearance) volume. The page opens with default figures that give displacement of 1,998.23 cm3, so you can see the scale before entering your own.
What does this displacement engine calculator show?
It shows Total displacement (in the cube of the chosen unit), Displacement, Swept volume of one cylinder (chosen unit cubed), Swept volume of one cylinder, Bore / stroke ratio, Bore-stroke character and Compression ratio, with the working and any warnings for your entries.