How much flow does a K-5.6 sprinkler need at 7 psi?

Q: How do you calculate sprinkler flow from K-factor?

Use the standard discharge equation Q = K × √P, where Q is GPM, K is the sprinkler orifice coefficient, and P is pressure at the sprinkler in psi. For example, K = 5.6 at 7 psi yields about 14.8 GPM. The calculator performs that same equation directly.