CFM to SCFM Calculator
Convert airflow accurately with our CFM to SCFM calculator. Understand how pressure and temperature affect airflow in real-world systems. Use this simple guide to calculate standard cubic feet per minute (SCFM) from actual CFM values quickly and correctly.
Airflow Conversion Calculator
How to Use the CFM to SCFM Calculator
Follow these simple steps to use the cfm to scfm calculator:
- Actual Airflow: Enter the actual airflow (CFM).
- Actual Temperature: Input the actual temperature (°F or °R).
- Actual Pressure: Enter the actual pressure (PSIA).
- Standard Temperature: Provide standard temperature (usually 68°F or 528°R).
- Standard Pressure: Enter standard pressure (usually 14.7 PSIA).
- Calculate: Click the calculate button.
- Result: View the result in SCFM instantly.
Tips:
- Always use absolute pressure (PSIA), not gauge pressure (PSIG).
- Convert temperature to Rankine (°R = °F + 459.67) if needed (the calculator handles this for you).
CFM to SCFM Conversion Formula
To convert CFM to SCFM, use this formula:
Where:
- CFM: Actual cubic feet per minute
- SCFM: Standard cubic feet per minute
- Pressure: Absolute pressure (PSIA)
- Temperature: Absolute temperature (Rankine)
Step-by-Step Calculation Example
Let’s calculate SCFM using a real example:
Given:
CFM = 100
Actual Pressure = 16 PSIA
Standard Pressure = 14.7 PSIA
Actual Temperature = 80°F = 539.67°R
Standard Temperature = 68°F = 528°R
Step 1: Write the formula
SCFM = CFM × (P_actual / P_standard) × (T_standard / T_actual)
Step 2: Insert values
SCFM = 100 × (16 / 14.7) × (528 / 539.67)
Step 3: Solve step-by-step
Pressure ratio = 16 / 14.7 = 1.088
Temperature ratio = 528 / 539.67 ≈ 0.978
SCFM = 100 × 1.088 × 0.978
Step 4: Final result
SCFM ≈ 106.4
Final Answer: 100 CFM ≈ 106.4 SCFM
CFM to SCFM Conversion Chart
Assumptions: Standard Conditions: 14.7 PSIA, 68°F | Example Actual Conditions: 16 PSIA, 80°F
| CFM | SCFM |
|---|---|
| 50 | 53.2 |
| 75 | 79.8 |
| 100 | 106.4 |
| 150 | 159.6 |
| 200 | 212.8 |
| 300 | 319.2 |
| 400 | 425.6 |
| 500 | 532.0 |
Note: Values may vary based on pressure and temperature inputs.
FAQs About CFM to SCFM Calculator
CFM measures actual airflow at current conditions. SCFM measures airflow at standard temperature and pressure. SCFM allows accurate comparison across systems.
SCFM helps engineers compare air systems under the same conditions. It improves accuracy in HVAC, compressors, and industrial design.
No. You must know pressure and temperature. Both values directly affect airflow conversion.
Standard conditions usually include: Pressure: 14.7 PSIA, Temperature: 68°F (528°R).
Not always. SCFM can be higher or lower depending on actual pressure and temperature.
It is commonly used in HVAC systems, air compressors, pneumatic tools, and industrial airflow analysis.
Use this formula: °R = °F + 459.67