CFM per Ton Calculator
Airflow per ton of cooling capacity.
Enter your values
ⓘ Live results
Results
- CFM per ton
- 383
- Target range
- 350–450 CFM/ton
- Airflow at 400 CFM/ton
- 1,200 CFM
- Difference from target
- -50 CFM
- Verdict
- on target
Quick answer
Most cooling systems are designed for about 400 CFM per ton, lower in humid climates and higher in dry ones.
CFM per ton = airflow / tons
How to use the CFM per Ton Calculator
- 1Measure or read the delivered airflow in CFM.
- 2Enter the nominal capacity in tons (12,000 BTU/h per ton).
- 3Adjust blower speed if the ratio sits outside 350–450.
Worked example
Using the values the calculator loads with:
Inputs
- Measured airflow1150 CFM
- System capacity3 tons
Results
- CFM per ton383
- Target range350–450 CFM/ton
- Airflow at 400 CFM/ton1,200 CFM
- Difference from target-50 CFM
- Verdicton target
Frequently asked questions
Why 400 CFM per ton?
It balances sensible cooling and dehumidification for typical loads.
When should I run lower?
In humid climates 350–375 CFM per ton keeps the coil colder and pulls out more moisture.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.