ACFM to ICFM Converter
ACFM (Actual Cubic Feet per Minute) and ICFM (Inlet Cubic Feet per Minute) both measure the same physical quantity — cubic feet per minute. The distinction is the measurement...
Formula
Source: Engineering Toolbox, CAGI standards | Last reviewed: June 8, 2026
Examples
1 ACFM
= 1 ICFM
1 ACFM = 1 ICFM at same conditions
100 ACFM
= 100 ICFM
500 ACFM
= 500 ICFM
Quick Reference Table
| ACFM | ICFM |
|---|---|
| 1 | 1 |
| 10 | 10 |
| 50 | 50 |
| 100 | 100 |
| 500 | 500 |
| 1000 | 1000 |
Where is this used?
When flow is measured at the compressor inlet, ICFM and ACFM are equivalent.
For flows measured elsewhere in the system (discharge, aftercooler), use the SCFM/ACFM converters with appropriate temperature and pressure corrections.
Frequently Asked Questions
What is the difference between ACFM and ICFM?
ACFM is a general term for actual cubic feet per minute at any measurement point. ICFM specifically refers to the flow measured at the compressor inlet flange. At the same conditions, the numeric value is identical.
When should I use ICFM vs ACFM?
Use ICFM when referring to compressor inlet conditions for performance testing and specification. Use ACFM as a general term for any flow measurement point in the system.
How does ICFM relate to SCFM?
ICFM is an actual flow at inlet conditions; SCFM is the same mass flow normalized to standard conditions. Convert ICFM to SCFM using temperature and pressure correction: SCFM = ICFM × (T_std/T_actual) × (P_actual/P_std).
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.