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Engine

Engine Displacement Calculator

Calculate engine displacement in cubic inches and liters from bore, stroke, and number of cylinders. Useful for stroker builds, sleeved blocks, and verifying spec sheets.

What this calculator is for

An engine displacement calculator converts bore, stroke, and cylinder count into total cubic inches and liters — the numbers you need for registration paperwork, carb CFM sizing, injector math, and “how big is this build?” conversations at the swap meet.

Stroker kits, overbores, and hybrid blocks (different crank in a common shell) should always be calculated, not guessed from the badge on the air cleaner. A “350” with a 3.75″ stroke is not 350 CI anymore.

A good outcome: accurate CI and liters for every downstream calculator on this site that asks for displacement.

Calculator

How to use this calculator

  1. Enter bore and stroke in inches and cylinder count.
  2. Results show total cubic inches and liters — useful for registration, parts ordering, and power-per-liter comparisons.

Measure bore and stroke to the actual machined dimensions, not nominal marketing sizes.

For metric engines, convert mm to inches (÷ 25.4) before entering if the tool expects inches — or use mm fields if provided on the live calculator.

Rotary and split-cycle engines are outside standard piston bore × stroke math.

Overbore of 0.030″ on a V8 adds roughly 18–20 CI total on a typical small-block — enough to change carb and injector recommendations.

The math: do it without a calculator

CI = (π ÷ 4) × Bore² × Stroke × Cylinders

Liters = CI × 0.016387

Example: 4.030″ × 3.622″ × 8 cylinders → ≈ 370 CI (≈ 6.06 L).

CI = (π ÷ 4) × Bore² × Stroke × Cylinders. Liters = CI × 0.016387.

Example: 4.030″ × 3.622″ × 8 ≈ 370 CI (≈ 6.06 L).

Stroker example: keep 4.000″ bore, move stroke from 3.480″ to 3.750″ → displacement climbs toward 383+ CI before any overbore.

Real-world examples

Chevrolet small-block 350

The classic 350 Chevy is defined by 4.000-inch bore, 3.480-inch stroke, and 8 cylinders — about 349.8 cubic inches (5.7 L). That is the reference displacement people mean when they say “a 350” at swap meets.

Honda K24

Honda documents the K24 family around 87 mm bore and 99 mm stroke (variants vary slightly). Four cylinders at those dimensions yield roughly 2,354 cc (2.4 L) — the displacement used on K-swap registration and parts catalogs.

Troubleshooting & fine-tuning your setup

Displacement Math vs Stamped Block vs “Overbored”

Catalog displacement (e.g., “350 Chevy”) is a marketing round number; calculated CI from bore and stroke is what matters for CFM, injector, and compression tools. A 0.030″ overbore changes displacement enough to affect carb sizing on borderline engines.

Metric engines list cc on the VIN and title; verify bore/stroke for stroker kits where only stroke changed. Hybrid builds (different crank in same block) need calculated displacement, not the original badge.

Frequently asked questions

Engine Displacement FAQs

How much does a 0.030 overbore add on a small-block Chevy?

On a 4.000″ bore / 3.480″ stroke eight-cylinder, +0.030 bore adds roughly 18–20 CI total — enough to matter for carb CFM and injector math.

Why does my calculated liters not match the window sticker?

Stickers round (e.g., 5.0 L vs 4,949 cc). Regulatory labels and calculated geometry often differ slightly; use calculated CI for internal engine math.

Do I count cylinders for a rotary?

This tool is for piston engines with bore and stroke. Rotaries use displacement per rotor and different power formulas.

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