Bedroom CFM Calculator
Ventilation airflow for a bedroom at the recommended 5 air changes per hour.
Bedrooms want quiet, steady dilution — duct velocity under 3 m/s keeps NC low.
Formula
Bedroom CFM Calculator is a free bedroom 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 Bedroom CFM Calculator
Ventilation airflow for a bedroom at the recommended 5 air changes per hour. The calculation implements Q = room volume × 5 ACH (ASHRAE 62.1/62.2 ventilation rates). Bedrooms want quiet, steady dilution — duct velocity under 3 m/s keeps NC low.
How to use Bedroom CFM Calculator
- 1Enter Length in m.
- 2Enter Width in m.
- 3Enter Ceiling height in m.
- 4Enter Air changes per hour in ACH.
- 5Read Required airflow, Airflow instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Bedroom CFM Calculator?
- ✓Implements the standard formula — Q = room volume × 5 ACH
- ✓Reference cited on-page: ASHRAE 62.1/62.2 ventilation rates
- ✓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 Bedroom CFM Calculator use?+
It computes Q = room volume × 5 ACH, per ASHRAE 62.1/62.2 ventilation rates. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Bedrooms want quiet, steady dilution — duct velocity under 3 m/s keeps NC low.
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 Bedroom 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.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live