Walk-In Freezer CFM Calculator
Evaporator airflow for a walk-in freezer.
Enter your values
Enter the refrigeration load in tons.
Enter the cfm per ton in CFM/ton.
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.
- Evaporator airflow
- 180 CFM
- Equivalent BTU/hr
- 18,000
- Defrost consideration
- Add electric or hot-gas defrost cycle timing separately
Quick answer
Walk-in freezers typically need about 100-140 CFM of evaporator airflow per ton, lower than coolers due to colder, denser air.
CFM = tons x CFM per ton
At a glance
| What it does | Evaporator airflow for a walk-in freezer. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Refrigeration load, CFM per ton |
| Main output | Evaporator airflow |
| Formula | CFM = tons x CFM per ton |
| Cost | Free — no sign-up, no download |
How to use the Walk-In Freezer CFM Calculator
- 1Determine the freezer's refrigeration load in tons.
- 2Use 100-140 CFM per ton, toward the low end for tightly packed frozen goods.
- 3Check that door strip curtains do not block evaporator discharge.
Inputs explained
- Refrigeration load(tons)
- Enter the refrigeration load in tons.
- CFM per ton(CFM/ton)
- Enter the cfm per ton in CFM/ton.
Worked example
Using the values the calculator loads with:
Inputs
- Refrigeration load1.5 tons
- CFM per ton120 CFM/ton
Results
- Evaporator airflow180 CFM
- Equivalent BTU/hr18,000
- Defrost considerationAdd electric or hot-gas defrost cycle timing separately
Frequently asked questions
Why lower CFM than a cooler?
Colder air is denser and freezer products tolerate less direct high-velocity airflow without freezer burn.
Multiple evaporators?
Common in larger boxes to keep temperature uniform corner to corner.
What do I need to enter into the Walk-In Freezer CFM Calculator?
Just 2 values: refrigeration load, cfm per ton. 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 Walk-In Freezer CFM Calculator work out the answer?
Walk-in freezers typically need about 100-140 CFM of evaporator airflow per ton, lower than coolers due to colder, denser air. It applies the formula CFM = tons x CFM per ton and shows the working so you can check each step by hand.
Is the Walk-In Freezer CFM 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.