Well Pump Calculator
Pump Sizing
Calculate required pump horsepower
Water Demand
Calculate household water demand in GPM
Formula
HP = (GPM × TDH) / (3960 × Efficiency) | TDH = Pumping Level + Pressure Head + Friction Loss | Pressure Head = PSI × 2.31
Frequently Asked Questions
What size well pump do I need?
Most residential wells use 0.5 to 1.5 HP submersible pumps. A 3-bedroom, 2-bath home typically needs a 0.75-1 HP pump delivering 8-12 GPM. Deep wells (200+ ft) or high-demand homes may need 1.5-2 HP.
How deep is the average residential well?
Residential wells typically range from 100-400 feet deep, with the national average around 150-200 feet. Depth depends on the local water table and geology. Some areas require wells over 500 feet.
How long does a well pump last?
Submersible well pumps typically last 8-15 years. Factors affecting lifespan include water quality (minerals, sand), cycling frequency, and proper sizing. Oversized or undersized pumps wear out faster.
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