Pump Head Calculator Formula
Understand the math behind the pump head calculator. Each variable explained with a worked example.
Formulas Used
Total Dynamic Head
total_head = static_head + friction_loss + pressure_headEquivalent Pressure
total_head_psi = (static_head + friction_loss + pressure_head) * 0.4333Variables
| Variable | Description | Default |
|---|---|---|
static_head | Static Head (elevation)(ft) | 30 |
friction_loss | Friction Head Loss(ft) | 10 |
pressure_head | Required Pressure Head(ft) | 46 |
How It Works
Total Dynamic Head (TDH)
TDH = Static Head + Friction Loss + Pressure Head
Static head is the vertical distance the pump must lift water. Friction loss accounts for resistance in the piping. Pressure head is any residual pressure needed at the delivery point (20 psi = 46 ft). Select a pump whose curve exceeds TDH at your design flow rate.
Worked Example
Pump lifts water 30 ft, 10 ft friction loss, need 20 psi (46 ft) at outlet.
static_head = 30friction_loss = 10pressure_head = 46
- 01TDH = 30 + 10 + 46 = 86 ft
- 02In psi = 86 x 0.4333 = 37.3 psi
- 03Select a pump rated above 86 ft TDH at the required GPM.
Ready to run the numbers?
Open Pump Head Calculator