Effective (In Boost) Compression Ratio Calculator

Calculate the in boost or active compression ratio of your motor using the active compression ratio calculator below.

Static Compression Ratio : : 1
Maximum Boost PSI :

Static Compression Ratio - If you do not know your engines compression ratio, you can figure it out using the Static Compression Ratio Calculator.
Maximum Boost PSI - This is the maximum amount of boost you plan on running. The higher the boost level, the higher the compression ratio, hence the reason for entering your MAXIMUM PSI.