How long does it take for your air compressor to fill an air tank?

I have been asked that question many times on this website, and since there appears to be a good deal of interest, I have added a page to this site dealing with how long it takes to fill an air tank.

gather this information

- V = Tank size
- Final pressure (cut-out pressure)
- Initial pressure (cut-in pressure)
- 7.48 - conversion from gallons to CFM
- Atmospheric pressure = 14.7
- Compressor Pump Delivery in CFM

Then, you apply the information to the following formula:

- My tank size = 100 gallons
- Cut-out pressure = 160 PSI
- Cut-in pressure = 80 PSI
- Conversion = 7.48
- Atmospheric pressure = 14.7
- Compressor Pump capacity = 4 CFM

That gives us:

Therefore:

100 x 80 = 8,000

Divided by:

440 (7.48 x 14.7 x 4 rounded up)

= 18.2 minutes

Folks, you are welcome to use these calculations yet be a bit cautious. While the information is sourced from a number of reputable locations I cannot be 100% sure of the accuracy, and therefore, you use this information at your own risk.

If you need to be 100% sure, get an engineer to help you.

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