Engine Displacement Calculator
Enter bore, stroke and cylinder count in inches or millimeters to get engine size in cc, liters and cubic inches, plus an optional static compression ratio from chamber, gasket, deck and piston volumes.
Displacement, 4.000 × 3.480 in, 8 cylinders
5,733 cc
Per cylinder: 43.73 ci. Bore 101.60 mm, stroke 88.39 mm.
Static compression ratio
10.24:1
Clearance volume 77.59 cc = chamber 64.00 + deck 5.15 + gasket 8.44 + piston 0.00. Swept 716.62 cc.
| Engine | Bore × stroke (published) | Cyl. | Published displacement | This calculator |
|---|---|---|---|---|
| Chevrolet Performance LS3 (19540155) | 4.065 × 3.622 in | 8 | 376 ci (6.2 L) | 376.1 ci, 6,162 cc |
| Chevrolet Performance 350 (19433031) | 101.6 × 88.39 mm | 8 | 350 ci (5.7 L) | 349.8 ci, 5,733 cc |
| Chevrolet Performance 454 HO (19433409) | 4.250 × 4.000 in | 8 | 454 ci (7.4 L) | 454.0 ci, 7,439 cc |
| Ford Performance 5.0L Gen 4 Coyote (M6007M50DAUTO) | 93 × 92.7 mm | 8 | 5.0 L | 5,038 cc, 307.4 ci |
Displacement = π/4 × bore² × stroke × cylinders (Engine Builder, Engine Math; Wikipedia citing Antelope Valley College, Displacement of a Piston). Compression ratio = (swept + clearance) ÷ clearance, with clearance = chamber + gasket volume (π/4 × gasket bore² × thickness) + deck volume (π/4 × bore² × deck clearance) − dome or + dish (Engine Builder; JE Pistons, Compression Ratio Theory). 1 in = 25.4 mm exactly and 1 in³ = 16.387064 cm³ (NIST SP 811, Appendix B.9). Sources accessed 2026-09-14.
How It Works
Each cylinder is a circle swept along the stroke, so its volume is π/4 × bore² × stroke. Multiply by the number of cylinders and you have the engine’s displacement. The calculator works in millimeters internally: inches are converted at exactly 25.4 mm per inch, cubic millimeters become cubic centimeters (divide by 1,000), and cubic inches come from the exact 16.387064 cm³ per cubic inch. Both conversion factors are from NIST Special Publication 811.
Bore matters more than stroke because it is squared. Adding 0.030 in to a 4.000 in bore raises a 350 to 355 cubic inches; stretching the stroke from 3.480 to 3.750 in on the same bore takes it to 377.
The optional compression ratio section follows the method published by Engine Builder and JE Pistons. Clearance volume is the space left above the piston at top dead center: the combustion chamber, plus the head gasket’s volume (π/4 × gasket bore² × thickness), plus the deck clearance volume (π/4 × bore² × distance the piston sits below the deck), minus a dome or plus a dish. Static compression ratio is (swept volume + clearance volume) ÷ clearance volume. Enter deck clearance as negative if the piston pops out above the deck, and remember that the result is a static ratio; cam timing changes the effective ratio.
Worked Example
A small-block Chevrolet with a 4.000 in bore, 3.480 in stroke and eight cylinders: one cylinder is π/4 × 4.000² × 3.480 = 43.73 cubic inches, so the engine is 349.8 cubic inches, which is 5,733 cc or 5.73 L, the engine everyone calls a 350. Chevrolet Performance publishes the same 350 crate engine at 101.6 × 88.39 mm and 350 cu in (5.7 L). With a 64 cc chamber, a 4.100 in gasket bore at 0.039 in thick (8.44 cc), the piston 0.025 in below the deck (5.15 cc) and a flat top, the clearance volume is 77.59 cc and the static compression ratio is (716.62 + 77.59) ÷ 77.59 = 10.24:1.
FAQ
Why does the calculator say 349.8 when the engine is sold as a 350?
Manufacturers round marketing names. A 4.000 × 3.480 in V8 is 349.8 cubic inches; a 4.065 × 3.622 in LS3 is 376.1, which Chevrolet Performance lists as 376. The calculator shows the unrounded figure so you can check race-class limits and part specs.
How many cc are in a liter and in a cubic inch?
1 liter is 1,000 cc (a cc is a cubic centimeter, the same as a milliliter). One cubic inch is 16.387064 cc exactly, because an inch is defined as 25.4 mm and 2.54³ = 16.387064.
Can I enter bore in millimeters and stroke in inches?
No, both use the unit you select. Switching the unit toggle converts the numbers already in the boxes, so you can type a metric bore, switch to inches and read it back.
What deck clearance and gasket bore should I use?
Measure them. Deck clearance is how far the piston top sits below the block deck at top dead center (a dial indicator across the deck), and gasket bore is the inside diameter printed in the gasket’s spec sheet. JE Pistons notes deck height is the one measurement the engine builder has to make for an accurate ratio; the piston dome or dish volume comes from the piston manufacturer.
Does the tool handle rotary or two-stroke engines?
No. The bore-and-stroke formula applies to reciprocating piston engines. Wankel rotaries are rated by chamber volume and, for tax purposes, are often counted at 1.5 times their stated displacement.
Sources
- Engine Builder: Engine Math for Engine Builders - cylinder volume = bore × bore × 0.7854 × stroke, displacement = cylinder volume × cylinders, worked 350 example (349.8 ci), deck and gasket volume formulas and dome/dish treatment for compression ratio
- JE Pistons: Compression Ratio Theory and How to Calculate - compression ratio definition, gasket volume = π × radius² × thickness, deck height sign convention, 77 × 53.6 mm = 249 cc example
- Wikipedia: Engine displacement - displacement = stroke × π × (bore/2)² × cylinders, citing Antelope Valley College, Displacement of a Piston
- NIST SP 811, Appendix B.9 - inch = 2.54 cm exactly; cubic inch to cubic meter conversion
- Chevrolet Performance LS3 crate engine - 4.065 × 3.622 in, 376 cu in (6.2 L)
- Chevrolet Performance 350 crate engine - 101.6 × 88.39 mm, 350 cu in (5.7 L)
- Chevrolet Performance 454 crate engine - 4.250 × 4.000 in, 454 cu in (7.4 L)
- Ford Performance 5.0L Gen 4 Coyote crate engine - 93 × 92.7 mm, 5.0 L