A Guide to Air Compressor Size: PSI, CFM, & HP

Many might be intimated by the term “air compressor” without realising that this device is used in various applications and industries.

However, as distributors of air compressors in Singapore, it’s essential to know more than what an air compressor could do. Understanding various specifications, specifically the air compressor size, is also essential. 

This article will cover all these air compressor measurements,  such as PSI, CFM, and HP, to help you understand the best compressor for different applications. 

Understanding PSI (Pounds per Square Inch)

Generally, PSI, or pounds per square inch, measures pressure in space. In the context of air compressors, PSI determines the force the machine can deliver to push air into a tool or piece of equipment. 

If the compressor has higher PSI levels, it has greater power to produce air volume and can be used in heavy-duty applications like industrial equipment, which requires around 150 PSI or more. Meanwhile,  lighter tasks like inflating tyres only require lower air compressor PSI, ideally around 28 to 36 PSI.  

CFM (Cubic Feet per Minute) and Its Role

Unlike PSI, which tells you the pressure amount, CFM or Cubic Feet per Minute indicates flow rate or the amount of air a compressor can supply in a tool per minute. 

Matching the tools’ CFM with the compressor’s output is crucial to avoid a mismatch, especially if you’re using multiple tools simultaneously. This will prevent malfunctions, unnecessary wear, and inefficiency in the device. 

CFM ratings vary depending on the application requirements. However, the general rule is that the larger and more complex the application, the higher the CFM needed. 

HP (Horsepower) and Its Impact on Compressor Power

HP or Horsepower is that unit that measures the compressor’s efficiency or the work output of the motor or engine. For air compressors, HP represents the engine’s capacity to generate the power necessary to perform the tasks. 

Many consumers consider HP more when choosing an air compressor, but it shouldn’t be. A higher HP is not always better. HP must always align the compressor’s PSI and CFM requirements to perform optimally. 

Remember, HP only shows the engine’s capability to do the work, but it doesn’t necessarily translate to higher or lower airflow or pressure. 

PSI vs. CFM vs. HP: Which One Should You Prioritise?

In choosing a compressor, understanding how the air compressor sizes work together is critical to achieving optimal functionality. 

For lighter tasks or applications, think of a nail gun. It needs enough pressure (PSI) to drill the nail and the right airflow rate (CFM) to clear debris. This is basically how you choose a compressor, with the right prioritisation and balancing of PSI and CFM within your tool’s requirements. 

On the other hand, if you need a compressor for heavy-duty or industrial air compression settings, balancing PSI, CFM, and HP is advised. 

However, the decision should still largely depend on the application requirements. As previously mentioned, some don’t consider HP much, only balancing PSI and CFM, as the latter two air compressor sizes mainly translate or measure the usable air output. 

Choosing the Right Air Compressor for Your Needs

Review these specifications and usage below to help you choose the best air compressor for home or industrial use.

Home Use

• Get smaller compressor models with sufficient PSI and CFM to match regular tools.
• A compressor with a 20-gallon tank and moderate HP is already a good starting point. 

Industry Applications

• Look for compressors with 60 gallons or more tank capacity to ensure sustained air pressure for continuous, heavy-duty use. 
• Higher PSI and CFM ratings are favourable for meeting the demands of industrial tools and types of machinery. 
• Prioritise getting models with adequate HP to support multiple tools and large-scale operations effortlessly. 

Ensuring the Right Fit with Key Air Compressor Size or Measurements

Understanding air compressor size and the impact of PSI, CFM, and HP on compressor performance will surely improve your purchasing decision. These measurements all play a unique role in a compressor’s performance, and matching them with one’s needs is critical to avoid overspending while still being efficient. 

If you need more guidance on this topic, don’t hesitate to contact your trusted industrial and construction machinery distributor in Singapore, like Lian Beng Machinery Co.

We deliver various top-notch air compressors, such as piston air compressors and oil-free air compressors. All our products are exported worldwide and meet industry standards, codes, and certifications. 

Contact us to learn more!