Convert SLPM to SCFH or SCFH to SLPM, with optional reference-temperature correction and equivalent SCFM, SCFD, SLPH and standard m³/h rates.
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SLPM to SCFH Formula
The following equation converts standard liters per minute to standard cubic feet per hour when both ratings use the same reference temperature and absolute pressure.
Formula source: NIST international-foot definition and NIST volume units: 1 ft = 0.3048 m exactly and 1 L = 0.001 m³.
- Where SCFH is the standard cubic feet per hour
- SLPM is standard liters per minute
At matching reference conditions, divide SLPM by 28.316846592 and multiply by 60 to obtain SCFH. Thus, 1 SLPM ≈ 2.1188800033 SCFH. For different reference temperatures at equal absolute pressure and ideal-gas behavior, also multiply by Tf/Ts, using kelvin: Tf is the SCFH-side temperature and Ts is the SLPM-side temperature. Reverse conversion uses the reciprocal factor.
| SLPM (L/min) | SCFH (ft³/hr) |
|---|---|
| 0.5 | 1.059 |
| 1 | 2.119 |
| 2 | 4.238 |
| 3 | 6.357 |
| 5 | 10.594 |
| 7.5 | 15.892 |
| 10 | 21.189 |
| 12 | 25.427 |
| 15 | 31.783 |
| 20 | 42.378 |
| 25 | 52.972 |
| 30 | 63.566 |
| 40 | 84.755 |
| 50 | 105.944 |
| 60 | 127.133 |
| 75 | 158.916 |
| 100 | 211.888 |
| 150 | 317.832 |
| 200 | 423.776 |
| 300 | 635.664 |
| * Rounded to 3 decimals from SCFH = (SLPM ÷ 28.316846592) × 60, at matching reference temperature and pressure. 1 ft³ = 28.316846592 L exactly; the factor is approximately 2.1188800033 SCFH per SLPM. | |
What Does “SLPM to SCFH” Mean?
Definition:
SLPM means standard liters per minute; SCFH means standard cubic feet per hour. Each is a gas flow expressed at declared reference temperature and pressure. These reference definitions vary by instrument or standard, so confirm that they match before using only the unit factor.
How to Calculate SLPM to SCFH?
Example Problem:
The following example outlines the steps and information needed to calculate SLPM to SCFH.
First, determine the liters per minute. In this case, the SLPM is found to be 500 L/min.
Next, the final and last step is to use the formula above to convert the units:
SCFH = SLPM/28.316846592 × 60, at matching reference temperature and pressure.
SCFH = 500/28.316846592 × 60
SCFH ≈ 1059.440 standard ft³/h
