Engine displacement is the total swept volume of all pistons within the cylinders of an internal combustion engine. Our CID calculator (Cubic Inch Displacement) provides the precise measurements required for engine rebuilding, performance tuning, and classic car restoration.
Whether you are working on a LS swap, a classic Chevy Big Block, or a high-revving Japanese 4-cylinder, calculating cylinder volume is the foundation for determining compression ratios and potential horsepower output.
The Formula: How to Calculate Cubic Inches (CID)
To find your engine size, you need to calculate the geometric volume of a cylinder and multiply it by the number of cylinders. Our tool uses the standard automotive engineering equation:
Bore and Stroke Impact
The bore is the diameter of the cylinder walls, while the stroke is the distance the piston travels from Top Dead Center (TDC) to Bottom Dead Center (BDC). Boring and stroking are the most effective ways to increase displacement for massive torque gains.
CID to Liters Conversion
Standard metric conversion: Divide CID by 61.0237 to get Liters. For example, a 350 CID Chevy is equivalent to a 5.7L, and the iconic Ford 302 is the world-famous 5.0L.
Engine Size & Performance FAQ
Does a larger displacement mean more horsepower?
Generally, larger displacement engines can pump more air and fuel, leading to higher torque. However, factors like volumetric efficiency and RPM limits also dictate final horsepower.
How do I find my engine's Bore and Stroke?
You can find these specs in your OEM service manual or by using a micrometer during a teardown. Common specs for Small Block Ford or Mopar engines are widely available in our technical database.
Standard Displacement Reference Table
| Common Engine Build | CID (Cubic Inches) | Metric (Liters) |
|---|---|---|
| JDM Inline-4 / Turbo | 122 - 150 CID | 2.0L - 2.5L |
| Classic Small Block V8 | 289 - 350 CID | 4.7L - 5.7L |
| American Big Block V8 | 427 - 502 CID | 7.0L - 8.2L |
Common Engine Specifications Reference
Quickly compare bore and stroke dimensions for popular performance platforms.
| Engine Model | Bore | Stroke | Total Size |
|---|---|---|---|
| Chevy Small Block 350 8 Cylinders | 4.000" | 3.480" | 5.7L / 350 CID |
| Ford 302 (5.0L Windsor) 8 Cylinders | 4.000" | 3.000" | 5.0L / 302 CID |
| GM LS1 / LS6 8 Cylinders | 3.898" | 3.622" | 5.7L / 346 CID |
| Honda K20A 4 Cylinders | 86.0 mm | 86.0 mm | 2.0L / 122 CID |
| Toyota 2JZ-GTE 6 Cylinders | 86.0 mm | 86.0 mm | 3.0L / 183 CID |
| Cummins 5.9L 24V 6 Cylinders | 4.020" | 4.720" | 5.9L / 359 CID |
SEO Note: Calculating displacement for overbored cylinders or stroker kits? Use our calculator above to input custom dimensions for oversize pistons or aftermarket crankshafts.