Free K‑Factor Calculator for Fire Sprinkler and Water Mist Systems
This free online K‑factor calculator allows fire sprinkler and water mist design engineers to quickly calculate flow rate, pressure, or K‑factor for sprinkler heads and nozzles. It is commonly used in hydraulic calculations for water‑based fire protection systems where the discharge from a sprinkler or nozzle is defined by a K‑factor.
Using the calculator below, you can solve for any of the three variables in the K‑factor equation and apply it to fire sprinklers, water mist nozzles, or other devices such as water cannons and foam pourers. If you would like a detailed technical explanation of how the equation works, please refer to our guide on the K‑factor formula for fire sprinklers.
Fire sprinkler K-factor calculator
Solve for
Common K-factors — Metric (l/min/bar^0.5)
How to use the K factor calculator
You will see that we have a metric and imperial version available. This is not strictly necessary, as the formula is the same; as long as you use the correct units, it's not an issue. Having the units added provides clarity.
If you look at the calculator, you will see we have Flow, Pressure and K factor across the top; these are the three K-factor variables that we can calculate. Under each are the two parameters which we need to specify, and directly below. Let's take an example: we wish to find the flow from a fire sprinkler head. We know the K-factor is 60.8 and the pressure at the head is 0.68 Bar, so the flow from the sprinkler will be 50.14 L/min. This is illustrated below:
If you like this, then you may also be interested in our Hcal calculator software, which you can download and use for free.
