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Calculate Pressure Ratio
By using SMOKEmUP.com's automath you agree to use this service for your own personal use. Re-transmission, performing calculations for others is PROHIBITED and will result in termination of your account with no refund.

This calculation will determine Pressure Ratio using the input from a compression tester gauge.

NOTE:
The result is NOT the "compression ratio".
The result is an indication of how well the compression process is being carried out. This should give you a rough idea, "ballpark", of the compression ratio of the engine. The only true way to determine the compression ratio is to calculate it. This calculation is not applicable to engines with long duration camshafts. Cams with overlap will allow cylinder pressure to bleed off resulting in an incorect reading.


Compression Tester Gauge Reading (psi)
Barometric Pressure (in mercury)

Calculator requires a subscription.



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