K-Factor Calculator
Q = K × √P — Solve for any variable
What do you want to calculate?
Flow (Q)
Volume per time
Pressure (P)
Operating pressure
K-Factor (K)
Device constant
Result
—
CALCULATION
Enter values above to calculate
Save Calculation
Sign in to save this calculation to your account
Common K-Factors
Click a row to use that K-factor in the calculator
| Device Type | K (L/min/√bar) | K (GPM/√PSI) |
|---|---|---|
| Standard Sprinkler (15mm) | 57 | 5.6 |
| Standard Sprinkler (20mm) | 80 | 8.0 |
| Large Orifice Sprinkler | 115 | 11.2 |
| Extra Large Orifice | 161 | 11.2 |
| ESFR Sprinkler (K14) | 202 | 14.0 |
| ESFR Sprinkler (K16.8) | 242 | 16.8 |
| ESFR Sprinkler (K25.2) | 363 | 25.2 |
K-factor conversion: Kmetric ≈ Kimperial × 14.4
Standards Reference
AS 2118.1 — Automatic fire sprinkler systems
NFPA 13 — Standard for the Installation of Sprinkler Systems
We provide no warranty or guarantee for the use of this tool or its accuracy. In no event will we be liable for any loss or damage, including, without limitation, indirect or consequential loss or damage, or any loss or damage arising from loss of data or profits arising out of, or in connection with, the use of this tool.