A Guide for Accurately Sizing Air Compressor Tanks
There's no need to overthink the purchase or replacement of an air compressor tank. While it is critically important to ensure your compressor is running with an appropriately-sized tank, our team is here to help answer any questions — no matter how big or small — you encounter along the way.
Some quick context: Air tanks are used to help the compressor cycle less, reducing maintenance costs in addition to reducing the amount of energy being consumed by the motor.
Sizing guide
So how big should your tank be? Our team recommends having a minimum of 2 gallons storage for every cubic foot per minute (CFM) created by your machine. Ideally, we will recommend having 4 gallons of storage per CFM.
Here's a sheet showing the correct conversions for recommended tank size based on the horsepower and CFM of your machine.
| Compressor Size | Capacity (CFM) | Gallons per CFM | Air Tank Size |
| 5 HP | 17 CFM | 4 | 68 |
| 7.5 HP | 23 CFM | 4 | 92 |
| 10 HP | 35 CFM | 4 | 140 |
| 15 HP | 51 CFM | 4 | 204 |
| 20 HP | 80 CFM | 4 | 320 |
| 25 HP | 100 CFM | 4 | 400 |
| 30 HP | 125 CFM | 4 | 500 |
| 40 HP | 170 CFM | 4 | 680 |
| 50 HP | 214 CFM | 4 | 856 |
| 60 HP | 245 CFM | 4 | 980 |
| 75 HP | 345 CFM | 4 | 1380 |
| 100 HP | 450 CFM | 4 | 1800 |
| 125 HP | 600 CFM | 4 | 2400 |
| 150 HP | 700 CFM | 4 | 2800 |
| 200 HP | 911 CFM | 4 | 3644 |
| 250 HP | 1150 CFM | 4 | 4600 |
| 300 HP | 1350 CFM | 4 | 5400 |