Compression Ratio Calculator
Absolute compression ratio of a refrigeration compressor and what it means for its life.
Always absolute pressures! High CR = high discharge temperature = cooked oil. Low-temp freezers live or die by this number.
Formula
Compression Ratio Calculator is a free compression ratio for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Compression Ratio Calculator
Absolute compression ratio of a refrigeration compressor and what it means for its life. The calculation implements CR = P_discharge(abs) / P_suction(abs) (Copeland/Emerson application engineering). Always absolute pressures! High CR = high discharge temperature = cooked oil. Low-temp freezers live or die by this number.
How to use Compression Ratio Calculator
- 1Enter Suction pressure (gauge) in kPa(g).
- 2Enter Discharge pressure (gauge) in kPa(g).
- 3Read Compression ratio instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Compression Ratio Calculator?
- ✓Implements the standard formula — CR = P_discharge(abs) / P_suction(abs)
- ✓Reference cited on-page: Copeland/Emerson application engineering
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Compression Ratio Calculator use?+
It computes CR = P_discharge(abs) / P_suction(abs), per Copeland/Emerson application engineering. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Always absolute pressures! High CR = high discharge temperature = cooked oil. Low-temp freezers live or die by this number.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Compression Ratio Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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