What is the difference between PSI and CFM in air compressors?

PSI (pounds per square inch) measures the air pressure a compressor generates, while CFM (cubic feet per minute) measures the volume of airflow delivered in a 60-second period. Both ratings are critical in determining the type of equipment that can be operated and directly impact tool performance.

How do I calculate the CFM requirements for my compressed air tools?

Start by finding the CFM specifications for your equipment. This information is available in the user manual or on the manufacturer's website. If you plan to use multiple tools simultaneously, add their CFM requirements together. Then, multiply the total by a safety factor of 1.5 to account for peak air demand conditions and ensure consistent performance.

What is considered a good PSI for an air compressor?

The optimal PSI for an air compressor varies based on its intended use and size. For example, an autobody shop typically needs an air compressor that produces around 150 PSI. In contrast, some specialized industrial applications may require compressors that deliver up to 20,000 PSI or more to operate heavy-duty machinery. 

How important is horsepower (HP) when choosing an air compressor?

Horsepower (HP) measures the work capacity of the motor or engine that powers the air compressor. While HP is important, CFM and PSI are more critical factors in determining the air compressor’s overall performance.

What size air compressor tank do I need?

To estimate the appropriate size for an air compressor tank, you can multiply your tool’s CFM (cubic feet per minute) requirement by 1.5 as a general guide, then round up to the nearest gallon. This figure can help determine the recommended tank size in gallons. Additionally, consider how long you need to use your tools without frequent interruptions for the compressor to refill. For continuous use, a larger tank will provide longer run times and may suit your needs better.

For example, if your tool requires 20 CFM, a tank in the 30-60 gallon range would be suitable for most applications.