Unit System:
1 Select Pump Type
Centrifugal
Single-Stage
Centrifugal
Multi-Stage
Progressive Cavity
PC Pump
Reciprocating
Triplex / Duplex
Diaphragm
AOD / Metering
Gear / Lobe
Positive Displacement
Submersible
ESP / Deep Well
Chem Metering
Injection Pump
2 Hydraulic Variables
SG
cP
psi
Gauge. Negative = suction lift.
psi
Gauge. Required at outlet.
ft
Positive = pump to higher elevation.
Pipe Data (for friction loss)
in
Leave blank to skip friction calc.
ft
in
ft
ft
Total equiv. pipe length for fittings.
Efficiency Factors
Select pump type + fill hydraulic variables → get TDH, brake HP, NPSHa, and motor size instantly
⚙️ Sizing Results — Centrifugal (Single-Stage)
Total Dynamic Head
—
Diff. Pressure (ΔP)
—
Friction Loss
—
Hydraulic Power
—
at pump shaft
Brake Power (BHP)
—
Motor Power Rec.
—
15% service factor
NPSHa
—
Flow Rate (GPM)
—
Pump Size Est.
—
nominal frame
Calculating...
Example Output
Centrifugal pump — 250 GPM, 100 psi discharge, 20 ft elevation
Total Dynamic Head
278
ft
Brake Power (BHP)
17.9
HP
Motor Rec.
20
HP (next standard frame)
Hydraulic Power
13.0
HP
NPSHa
24.1
ft — ✓ OK
Diff. Pressure (ΔP)
120.7
psi
↑ Fill in your numbers above and hit Calculate to get results like these