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Engine displacement calculator

Compute an engine's displacement from its bore, stroke and number of cylinders.

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Enter Bore (mm), Stroke (mm), Cylinders and the Engine displacement calculator works out Displacement (cc), Displacement (L) straight away. For instance, with Bore (mm) = 86, Stroke (mm) = 86 and Cylinders = 4 it returns Displacement (cc) = 1,998 and Displacement (L) = 1.998.

How to use it

  1. Enter your values: Bore (mm), Stroke (mm), Cylinders.
  2. Read the result instantly: Displacement (cc), Displacement (L).

Frequently asked questions

What does the Engine displacement calculator actually compute?

It takes Bore (mm), Stroke (mm) and Cylinders and derives Displacement (cc) and Displacement (L) from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

3 values: Bore (mm), Stroke (mm) and Cylinders. Nothing else is required — no account, no file upload.

Can you show a worked example?

With Bore (mm) = 86, Stroke (mm) = 86 and Cylinders = 4, the calculator returns Displacement (cc) = 1,998 and Displacement (L) = 1.998. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Bore (mm) = 94.6, Stroke (mm) = 94.6 and Cylinders = 8 instead, Displacement (cc) goes from 1,998 to 5,319 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Bore (mm) = 77.4, Stroke (mm) = 77.4 and Cylinders = 2, Displacement (cc) comes out at 728. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Checking a homework answer, sizing something before building it, and getting an order of magnitude before committing to a design — a torque on a bolt, the force a spring returns, the frequency a circuit resonates at, how long light takes to arrive.

What is the most common mistake?

Feeding in a value in the wrong unit. Physics formulas assume SI throughout, so grams instead of kilograms or centimetres instead of metres shifts the answer by powers of ten without any warning.

What is the difference between the Engine displacement calculator and the Displacement calculator?

This one returns Displacement (cc) and Displacement (L); the Displacement calculator returns Displacement (m). That is the whole difference — open the one whose figure you need.

Where do the figures come from, and how current are they?

Constants are the CODATA values and the formulas are the textbook ones. Most assume an idealised case — no air resistance, no friction, a point mass — and the tool says so where the simplification matters.

Further reading

All guides →
ExplainerEngine Displacement and Compression Ratio: What They Actually Tell YouBoth numbers are pure geometry — one is the volume a piston sweeps, the other a ratio of two volumes — and both are read as if they described power. Here is each derivation worked on real engines, and exactly what each number can and cannot support.ExplainerCompression Ratio, and What Actually Limits ItEfficiency rises with compression ratio, so why do petrol engines stop around 12:1? Because compressing a charge heats it — r to the power of gamma minus one — and above a certain temperature the unburnt end gas lights itself.ExplainerHooke's Law Explained: F = kx, Real Spring Constants, and Where It Stops HoldingHooke's law says force is proportional to stretch — but only below the elastic limit. Here is F = kx with worked numbers, what a 200 N/m spring actually feels like, and how springs combine.ExplainerWhat Is the Reynolds Number? The Formula, the Units That Cancel, and Why 2 300 Is Only for PipesRe = ρvL/μ compares inertia with viscosity, and the units really do cancel. See the number worked out for honey, a household pipe, an artery, a swimmer and a wing — and why the 2 300 threshold belongs to pipe flow alone.GuideThe Four Kinematics Equations: Which One to Use, and What Each One Leaves OutFive variables, four equations, and each equation is missing exactly one of them. Choose by looking at the variable the question never mentions.ExplainerHow the Doppler Effect Works: The Formula, the Sign Convention, and Why Moving the Source Is Not the Same as Moving the ListenerFor sound, f' = f(v + v_o)/(v − v_s) — and getting the signs backwards is the classic error. Here is the convention spelled out, a 440 Hz source computed at four speeds, and why light needs a different equation entirely.
Engine displacement calculator — OneKitly