Enter the total cubic feet per minute (CFM) and the total tonnage of cooling into the calculator to determine the cfm per ton.

CFM Per Ton Formula

The following formula is used to calculate the total cubic feet per minute per ton of cooling. 

CFPT = CFM / C
  • Where CFPT is the cubic feet per minute per ton
  • CFM is the cubic feet per minute
  • C is the tonnage of cooling.

To calculate CFM per ton, divide the volumetric flow in cubic feet per minute by the tonnage of cooling.

CFM Per Ton Definition

What is CFM per ton?

CFM per ton, which stands for cubic feet per minute per ton, is a measure of the amount of air an air-conditioner can cool per tonnage of cooling.

Example Problem

how to calculate CFM per ton?

First, determine the total cubic feet per minute of air moving through an area. In this example, the fans are moving the air at a rate of 450 CFM.

Next, determine the total tonnage of cooling required for that air. In this case, we will use an average of 4 tons.

Finally, calculate the CFM per ton using the formula above:

CFPT = CFM / C

CFPT = 450 / 4

CFPT = 112.5 CFM /ton