CFM to BTU Calculator
Find the exact cooling or heating capacity using our simple cfm to btu calculator. Convert airflow (CFM) into BTU quickly for HVAC systems, ventilation, and air conditioning needs. Get accurate results and make better decisions for your space in seconds.
Airflow to Capacity Converter
How to Use the CFM to BTU Calculator
Follow these simple steps to use the cfm to btu calculator:
- Enter Airflow: Input the airflow value in CFM (Cubic Feet per Minute).
- Input ΔT: Enter the temperature difference (ΔT) in °F.
- Calculate: Click the "Calculate" button.
- Review Results: The calculator instantly shows the BTU value.
- Apply: Use the result to size HVAC systems or evaluate airflow efficiency.
Tips:
- Use accurate temperature difference for better results.
- Double-check units before calculating.
- Ideal for HVAC engineers, technicians, and homeowners.
How to Convert CFM to BTU
To convert CFM to BTU, use this standard formula:
Where:
- CFM: Airflow (Cubic Feet per Minute)
- ΔT: Temperature difference (°F)
- 1.08: Constant for air properties
Step-by-Step Example
Let’s calculate BTU using a real example:
Given:
- CFM = 500
- ΔT = 20°F
Step 1: Multiply CFM by ΔT
500 × 20 = 10,000
Step 2: Multiply by constant (1.08)
10,000 × 1.08 = 10,800 BTU
Final Answer:
BTU =
10,800
This means the airflow produces 10,800 BTU of heating or cooling capacity.
CFM to BTU Conversion Chart (ΔT = 20°F)
Quick Reference Table for common airflow values at a constant temperature difference of 20°F:
| CFM | BTU (ΔT = 20°F) |
|---|---|
| 100 | 2,160 BTU |
| 200 | 4,320 BTU |
| 300 | 6,480 BTU |
| 400 | 8,640 BTU |
| 500 | 10,800 BTU |
| 600 | 12,960 BTU |
| 700 | 15,120 BTU |
| 800 | 17,280 BTU |
| 900 | 19,440 BTU |
| 1000 | 21,600 BTU |
Note: Values assume a constant temperature difference of 20°F. Change ΔT to get different results.
Frequently Asked Questions (CFM to BTU Calculator)
A cfm to btu calculator converts airflow into heating or cooling capacity. It helps size HVAC systems accurately.
1 CFM equals 1.08 × ΔT BTU. The value depends on the temperature difference.
ΔT shows the temperature change. A higher ΔT increases the BTU value.
Yes. The formula works for both heating and cooling applications.
1.08 represents air density (0.075 lbs/ft³), specific heat of air (0.24 BTU/lb·°F), and the conversion of hours to minutes (60 min/hr). (0.075 × 0.24 × 60 = 1.08).
The calculation is highly accurate for standard air conditions. Adjustments may be needed for extreme environments (high altitude or extreme humidity).
Engineers use it in HVAC design, duct sizing, and ventilation systems to ensure equipment can handle the load.