Kitchen Hood CFM Calculator
Exhaust for a commercial wall-canopy hood from length and cooking duty.
IMC minimums; listed (UL 710) hoods may run less. Don't forget ~80% makeup air, or the hood starves and the dining room smells like the fryer.
Formula
Kitchen Hood CFM Calculator is a free kitchen hood cfm for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Kitchen Hood CFM Calculator
Exhaust for a commercial wall-canopy hood from length and cooking duty. The calculation implements Q = length × (310/465/620 L/s·m by duty) ≈ 200/300/400 CFM/ft (IMC 507; NFPA 96). IMC minimums; listed (UL 710) hoods may run less. Don't forget ~80% makeup air, or the hood starves and the dining room smells like the fryer.
How to use Kitchen Hood CFM Calculator
- 1Enter Hood length in m.
- 2Enter Cooking duty (1 light (ovens) · 2 medium (ranges) · 3 heavy (charbroilers)).
- 3Read Exhaust airflow instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Kitchen Hood CFM Calculator?
- ✓Implements the standard formula — Q = length × (310/465/620 L/s·m by duty) ≈ 200/300/400 CFM/ft
- ✓Reference cited on-page: IMC 507; NFPA 96
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Kitchen Hood CFM Calculator use?+
It computes Q = length × (310/465/620 L/s·m by duty) ≈ 200/300/400 CFM/ft, per IMC 507; NFPA 96. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
IMC minimums; listed (UL 710) hoods may run less. Don't forget ~80% makeup air, or the hood starves and the dining room smells like the fryer.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Kitchen Hood CFM Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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