How to Size Air Compressor Tanks
What do air tanks do? Air Tanks help the compressor cycle less which reduces related maintenance costs on the inlet of the compressor as well as reduce the amount of energy being consumed by the compressor motor.

How large should I size my air tank? It is recommended to have a minimum of 2 gallons of storage per every CFM and we highly recommend having 4 gallons of storage per CFM.
Here is a quick sheet showing the air compressor horsepower, average CFM or output and recommended tank size;
Compressor Size | Capacity | Gallons Per CFM | Recommend |
Horsepower | CFM | Air Tank | |
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 |