Evaporator Airflow Per Ton Calculator
CFM per ton for an evaporator coil.
Enter your values
Enter the measured or design airflow in CFM.
Enter the cooling capacity in tons.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- CFM per ton
- 400
- Assessment
- Within typical comfort-cooling range
- Sensible heat ratio implication
- Balanced sensible/latent
Quick answer
Standard comfort-cooling evaporator coils are designed around 350-450 CFM per ton, with refrigeration coils often lower.
CFM per ton = airflow / tons
At a glance
| What it does | CFM per ton for an evaporator coil. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Measured or design airflow, Cooling capacity |
| Main output | CFM per ton |
| Formula | CFM per ton = airflow / tons |
| Cost | Free — no sign-up, no download |
How to use the Evaporator Airflow Per Ton Calculator
- 1Measure or take the design airflow across the coil.
- 2Divide by the coil's rated tons of cooling.
- 3Compare against the 350-450 CFM/ton comfort cooling benchmark.
Inputs explained
- Measured or design airflow(CFM)
- Enter the measured or design airflow in CFM.
- Cooling capacity(tons)
- Enter the cooling capacity in tons.
Worked example
Using the values the calculator loads with:
Inputs
- Measured or design airflow1200 CFM
- Cooling capacity3 tons
Results
- CFM per ton400
- AssessmentWithin typical comfort-cooling range
- Sensible heat ratio implicationBalanced sensible/latent
Frequently asked questions
What about refrigeration coils?
Refrigeration and dehumidification-focused coils run lower, often 100-250 CFM per ton.
Why does low CFM/ton risk frosting?
Too little airflow lets coil surface temperature drop below freezing, icing the fins.
What do I need to enter into the Evaporator Airflow Per Ton Calculator?
Just 2 values: measured or design airflow, cooling capacity. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Evaporator Airflow Per Ton Calculator work out the answer?
Standard comfort-cooling evaporator coils are designed around 350-450 CFM per ton, with refrigeration coils often lower. It applies the formula CFM per ton = airflow / tons and shows the working so you can check each step by hand.
Is the Evaporator Airflow Per Ton Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.