CFM to kg/s Calculator
Convert volumetric CFM to a mass airflow rate.
Enter your values
ⓘ Live results
Results
- 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
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.
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.
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.