System head requirement calculator

Static head remains while the friction contribution changes approximately with flow squared in this model.

Units

H = H_{\text{static}} + K \times Q^{2}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

H = 25 + 0.0002 \times {400}^{2} = 57

Symbol	Meaning	Unit
$H$	required system head	ft
$H_{\text{static}}$	static head	ft
$K$	system resistance coefficient	ft/(gpm)^2
$Q$	volume flow	gpm

Symbol	Meaning	Unit
$H$	required system head	m
$H_{\text{static}}$	static head	m
$K$	system resistance coefficient	m/(L/s)²
$Q$	volume flow	L/s

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.