About Room Volume & HVAC Airflow Calculator
Calculate 3D room air volume in cubic feet and cubic meters. Automatically estimates required air conditioning cooling capacity (BTUs and tons) and 5-ACH ventilation CFM airflow.
Key Capabilities & Features
- 3D volume calculation from length, width, and ceiling height
- Cubic feet and cubic meters output
- HVAC air conditioning cooling capacity estimation in BTUs and Tons
- Climate zone calibration (mild, moderate, hot/humid)
- Residential 5-ACH ventilation airflow (CFM) requirement
How to Use Room Volume & HVAC Airflow Calculator
1
Enter Dimensions
Enter room length, width, and ceiling height in feet.
2
Select Climate & Sun Exposure
Choose your region climate and whether the room has high southern/western sun.
3
View HVAC Recommendations
Review required cooling BTUs and CFM ventilation airflow.
Privacy & In-Browser Execution Guarantee
100% client-side calculation. Your project measurements never leave your device.
Frequently Asked Questions
How many BTUs do I need per square foot for air conditioning?
A standard residential baseline is 20 to 25 BTUs per square foot of floor area with standard 8-foot ceilings, adjusted upwards for high ceilings or high sun exposure.
How many BTUs are in 1 ton of air conditioning?
One ton of refrigeration/AC capacity equals exactly 12,000 BTUs per hour of cooling power.
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