BTU to CFM Calculator
A BTU to CFM calculator helps you convert cooling capacity into airflow quickly and accurately. Use this tool to size HVAC systems, improve ventilation, and ensure proper air distribution. Get reliable results in seconds with simple inputs and clear calculations.
Cooling to Airflow Converter
How to Use the BTU to CFM Calculator
Follow these simple steps to use the btu to cfm calculator effectively:
Step-by-Step Instructions
- Enter the BTU value: Input the cooling capacity in BTU (British Thermal Units).
- Enter the temperature difference (ΔT): Use the difference between supply air and room air temperature (°F). Common value: 16°F to 20°F.
- Click the Calculate button: The calculator will instantly convert BTU to CFM.
- Review the result: The output shows airflow in CFM (Cubic Feet per Minute).
How to Convert BTU to CFM (Step-by-Step)
To convert BTU to CFM, use this standard HVAC formula:
Where:
- CFM = Airflow (Cubic Feet per Minute)
- BTU = Cooling capacity
- 1.08 = Air constant (for standard air conditions)
- ΔT = Temperature difference (°F)
Step-by-Step Calculation Example
Example: Convert 12,000 BTU to CFM with a temperature difference of 20°F.
Step 1: Write the formula
CFM = BTU ÷ (1.08 × ΔT)
Step 2: Insert values
CFM = 12,000 ÷ (1.08 × 20)
Step 3: Multiply denominator
1.08 × 20 = 21.6
Step 4: Divide
CFM = 12,000 ÷ 21.6
CFM ≈ 556
Final Answer: 12,000 BTU ≈ 556 CFM
BTU to CFM Conversion Chart (ΔT = 20°F)
This table helps you quickly estimate airflow without calculation.
| BTU | CFM (Approx) |
|---|---|
| 6,000 | 278 CFM |
| 9,000 | 417 CFM |
| 12,000 | 556 CFM |
| 18,000 | 833 CFM |
| 24,000 | 1,111 CFM |
| 30,000 | 1,389 CFM |
| 36,000 | 1,667 CFM |
| 48,000 | 2,222 CFM |
| 60,000 | 2,778 CFM |
Note: Values may vary slightly depending on temperature difference.
FAQs – BTU to CFM Calculator
BTU measures heat energy. It shows how much heat an air conditioner can remove per hour.
CFM stands for Cubic Feet per Minute. It measures airflow volume in HVAC systems.
You convert BTU to CFM to size ducts, fans, and ventilation systems correctly.
Most HVAC systems use a ΔT of 16°F to 20°F for cooling calculations.
The formula gives a reliable estimate under standard air conditions. Real systems may vary slightly.
Yes, but you must adjust the temperature difference based on heating conditions.
Low airflow reduces efficiency, causes uneven cooling, and may damage HVAC equipment.
High airflow can reduce humidity control and create noise in the system.