Well Pump Size Calculator
Determine the correct well pump size for your needs.
feet
feet
Depth from surface to water when pump is off
GPM
Typical home: 6-12 GPM
Total Dynamic Head = Pumping Depth + Pressure Head + Friction Loss; HP = (GPM × TDH) / 3960 / Efficiency
Example: 10 GPM flow, 200 ft well depth, 30 PSI = 0.75 HP pump needed. Recommended: 1 HP pump for reliable performance and longevity
How do I determine GPM needs?
Count fixtures: Each bathroom = 3 GPM, kitchen = 2 GPM, washing machine = 2 GPM, outdoor faucet = 5 GPM. Peak demand is typically 6-12 GPM for homes.
What is Total Dynamic Head?
TDH is the total pressure the pump must overcome: pumping depth + pressure tank setting + friction losses. Higher TDH requires more HP.
📐 Formula
Total Dynamic Head = Pumping Depth + Pressure Head + Friction Loss; HP = (GPM × TDH) / 3960 / Efficiency
📝 Example Calculation
Example: 10 GPM flow, 200 ft well depth, 30 PSI = 0.75 HP pump needed. Recommended: 1 HP pump for reliable performance and longevity
❓ Frequently Asked Questions
How do I determine GPM needs?▼
Count fixtures: Each bathroom = 3 GPM, kitchen = 2 GPM, washing machine = 2 GPM, outdoor faucet = 5 GPM. Peak demand is typically 6-12 GPM for homes.
What is Total Dynamic Head?▼
TDH is the total pressure the pump must overcome: pumping depth + pressure tank setting + friction losses. Higher TDH requires more HP.