Compressor Calculator

Calculate compressor performance metrics including CFM, required horsepower, pressure ratios, and efficiency.

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Worked Example & Common Values

Below is a sample worked calculation demonstrating how Compressor Calculator processes input data instantly inside your browser.

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About This Tool

This comprehensive compressor calculator helps engineers, technicians, and HVAC professionals determine key performance metrics for air compressors. Input parameters like displacement, RPM, volumetric efficiency, inlet pressure, discharge pressure, and specific heat ratio to calculate CFM (cubic feet per minute), required horsepower, pressure ratio, and temperature rise. The tool uses standard compressor equations to provide accurate results for system design, troubleshooting, and optimization.

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How to Use

Enter the compressor displacement in cubic inches
Input the compressor RPM (revolutions per minute)
Set the volumetric efficiency percentage (typically 70-95%)
Provide inlet and discharge pressures in PSI
Enter the specific heat ratio (k-value, typically
4 for air)
Click 'Calculate' to see CFM, required horsepower, pressure ratio, and temperature rise results
Use 'Reset' to clear all fields and start over

Frequently Asked Questions

Find Quick Answers

What is CFM in compressor calculations?

CFM (Cubic Feet per Minute) measures the volumetric flow rate of air delivered by the compressor. It's calculated using displacement, RPM, and volumetric efficiency.

How do I determine volumetric efficiency?

Volumetric efficiency typically ranges from 70% to 95% for well-maintained compressors. Newer compressors are at the higher end, while older units may be lower. Consult manufacturer specifications for exact values.

What is the specific heat ratio (k-value)?

The specific heat ratio (k or γ) is the ratio of specific heats at constant pressure to constant volume. For dry air at standard conditions, it's approximately 1.4. Different gases have different k-values.

Can this calculator be used for different types of compressors?

Yes, this calculator works for reciprocating, rotary screw, and centrifugal compressors as long as you input the correct parameters. The calculations are based on fundamental compressor thermodynamics.

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