CFM to kg/s Calculator
Convert volumetric CFM to a mass airflow rate.
Enter your values
Enter the volumetric airflow in CFM.
Enter the air density in kg/m3.
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.
- Mass flow rate
- 1.1365 kg/s
- Volumetric flow
- 0.9439 m3/s
- Per hour
- 4091.2 kg/hr
Quick answer
Mass airflow in kg/s equals the volumetric flow in cubic meters per second multiplied by the air density in kg per cubic meter.
kg/s = CFM x 0.0004719 x density
At a glance
| What it does | Convert volumetric CFM to a mass airflow rate. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Volumetric airflow, Air density |
| Main output | Mass flow rate |
| Formula | kg/s = CFM x 0.0004719 x density |
| Cost | Free — no sign-up, no download |
How to use the CFM to kg/s Calculator
- 1Enter the volumetric airflow in CFM.
- 2Enter the local air density (1.204 kg/m3 is standard at 20C sea level).
- 3Convert CFM to m3/s then multiply by density to get the mass flow rate.
Inputs explained
- Volumetric airflow(CFM)
- Enter the volumetric airflow in CFM.
- Air density(kg/m3)
- Enter the air density in kg/m3.
Worked example
Using the values the calculator loads with:
Inputs
- Volumetric airflow2000 CFM
- Air density1.204 kg/m3
Results
- Mass flow rate1.1365 kg/s
- Volumetric flow0.9439 m3/s
- Per hour4091.2 kg/hr
Frequently asked questions
Why does mass flow matter for HVAC?
Mass flow, not volume, determines actual heat transfer capacity, especially at altitude where density is lower.
What density should I use at altitude?
Air density drops with altitude — use a corrected value from a density calculator for accurate results.
What do I need to enter into the CFM to kg/s Calculator?
Just 2 values: volumetric airflow, air density. 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 CFM to kg/s Calculator work out the answer?
Mass airflow in kg/s equals the volumetric flow in cubic meters per second multiplied by the air density in kg per cubic meter. It applies the formula kg/s = CFM x 0.0004719 x density and shows the working so you can check each step by hand.
Is the CFM to kg/s 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.