Mini Split Head Airflow Calculator
CFM output for a ductless mini split head by BTU.
Enter your values
Enter the unit capacity in BTU/hr.
Enter the cfm per 1000 btu you are working with.
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.
- Estimated airflow
- 360 CFM
- Equivalent tons
- 1
- Throw distance guide
- 24 ft typical horizontal throw
Quick answer
Ductless mini split heads typically deliver about 25-35 CFM per 1,000 BTU/hr of rated capacity.
CFM = (BTU/hr / 1000) x CFM per 1000 BTU
At a glance
| What it does | CFM output for a ductless mini split head by BTU. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Unit capacity, CFM per 1000 BTU |
| Main output | Estimated airflow |
| Formula | CFM = (BTU/hr / 1000) x CFM per 1000 BTU |
| Cost | Free — no sign-up, no download |
How to use the Mini Split Head Airflow Calculator
- 1Look up the indoor head's rated cooling capacity in BTU/hr.
- 2Apply 25-35 CFM per 1000 BTU depending on fan speed setting.
- 3Use the airflow to judge room coverage and required clearances.
Inputs explained
- Unit capacity(BTU/hr)
- Enter the unit capacity in BTU/hr.
- CFM per 1000 BTU
- Enter the cfm per 1000 btu you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Unit capacity12000 BTU/hr
- CFM per 1000 BTU30
Results
- Estimated airflow360 CFM
- Equivalent tons1
- Throw distance guide24 ft typical horizontal throw
Frequently asked questions
Does this match the spec sheet exactly?
Manufacturers publish exact high/med/low CFM — use this as a planning estimate when specs aren't handy.
Ducted mini split?
Ducted units often run higher static and slightly different CFM curves — check the fan performance table.
What do I need to enter into the Mini Split Head Airflow Calculator?
Just 2 values: unit capacity, cfm per 1000 btu. 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 Mini Split Head Airflow Calculator work out the answer?
Ductless mini split heads typically deliver about 25-35 CFM per 1,000 BTU/hr of rated capacity. It applies the formula CFM = (BTU/hr / 1000) x CFM per 1000 BTU and shows the working so you can check each step by hand.
Is the Mini Split Head Airflow 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.