# Compression Ratio Calculator

> Calculate engine compression ratio (CR) from cylinder bore, piston stroke, chamber volume, piston dish/dome, deck clearance, and gasket thickness.

**URL:** https://www.calculatoranswers.com/compression-ratio-calculator
**Category:** Home

## Quick Answer

Calculate static engine compression ratio (CR). Input bore, stroke, combustion chamber, piston head, gasket, and deck specs.

## Definition

A compression ratio calculator is an automotive engineering utility used to calculate an engine's static compression ratio. It compares total cylinder volume when the piston is at Bottom Dead Center (BDC) with clearance volume at Top Dead Center (TDC). It accounts for cylinder bore, stroke, cylinder head combustion chamber, piston head design, gasket thickness/bore, and deck clearance.

## How to Use

1. **Select measurement unit** — Choose between imperial (inches/cc) or metric (mm/cc) units.
2. **Input cylinder bore and stroke** — Enter your engine's cylinder bore and stroke measurements.
3. **Input chamber and piston volumes** — Type combustion chamber volume and piston head volume (dish is positive, dome is negative).
4. **Add gasket and deck details** — Input head gasket thickness, gasket bore diameter, and piston deck clearance.
5. **Review compression ratio** — Check the calculated displacement, clearance volume, and final compression ratio.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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