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Ventilation Rate CFM per Person Calculator
Find the outdoor air supply a room needs based on occupants and floor area.
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Outdoor air
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Find the outdoor air supply a room needs based on occupants and floor area.
Ventilation Rate CFM per Person Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Outdoor air = people x CFM per person + area x CFM per sq ft.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Ventilation Quick Guide
Typical values for reference.
| People | CFM/person | Area | CFM |
|---|---|---|---|
| 5 | 5 | 800 | 73 CFM |
| 20 | 5 | 800 | 148 CFM |
| 50 | 5 | 800 | 298 CFM |
| 100 | 5 | 800 | 548 CFM |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Ventilation Rate CFM Calculator FAQ
Answers to common questions about this calculator.
Often 5 to 20 CFM per person depending on use.
Building materials and activities add pollutants.
Cubic feet per minute.
No, check your local code.