NCFM to SCFM Converter
NCFM (Normal Cubic Feet per Minute) is referenced to 'Normal' conditions (typically 32°F, 14.696 psia in some industries, or 70°F in others). SCFM uses Standard conditions (68°F,...
Formula
Source: Engineering Toolbox, CAGI standards | Last reviewed: June 8, 2026
Examples
100 ncfm
= 100 SCFM
- T_actual = 70
- P_atm_psi = 14.696
At standard conditions, NCFM = SCFM
100 ncfm
= 94.1 SCFM
- T_actual = 32
- P_atm_psi = 14.696
Cold NCFM measurement (32°F) corrects to less SCFM
100 ncfm
= 107.7 SCFM
- T_actual = 100
- P_atm_psi = 14.7
Hot NCFM measurement corrects to more SCFM
Where is this used?
Natural gas metering systems, compressor data sheets from European vs US manufacturers, and process gas specifications where reference conditions must be standardized.
Frequently Asked Questions
What is the difference between NCFM and SCFM?
Both are referenced volumetric flow rates, but they use different standard temperatures. SCFM typically uses 68°F (520°R), while NCFM may use 32°F, 60°F, or 70°F depending on the industry. The temperature difference creates a small correction factor.
Which normal reference should I use?
Check your equipment documentation. The natural gas industry often uses 60°F, while European manufacturers may use 0°C (32°F). This converter defaults to 70°F for the NCFM measurement point.
Is the conversion the same at all pressures?
Yes, if both NCFM and SCFM use the same standard pressure (14.696 psia), only the temperature correction applies. If the pressures differ, enter the correct P_atm_psi value.
Reviewed for accuracy
· Last reviewed: June 8, 2026
All calculations are for reference only. Always verify with manufacturer data and a qualified engineer for critical applications. Learn about our editorial process.