Well Pump Sizing Tool
Enter your well depth and your household's fixture count. We'll size the pump (HP and GPM) and the pressure tank — and tell you what each part should cost in 2026.
Your well & household
Total drilled depth, not static water level.
Zones running simultaneously, not total.
Recommended setup
3/4 HP 4-inch submersible pump, 6 GPM · 44-gal pressure tank
Why this pump: At 150 ft and 6 GPM peak demand, a 0.75 HP submersible is the standard pick. Make sure your wire size is rated for the depth — voltage drop kills pumps.
Tank example: Amtrol WX-250 / Wellmate WM-14. Drawdown of 12 gal at your pressure setting gives the pump roughly 1 minute of run time at peak demand — that's the threshold for motor longevity.
Total parts estimate: $1,180 – $2,500. Add roughly $800-$2,000 for installation labor depending on whether the pump is being pulled and replaced or a new well is being commissioned.
Sizing notes
- Don't oversize. A pump bigger than your well's recovery rate will short-cycle and burn out. Have your driller run a pumping test if you don't know your well's yield.
- Wire size matters. Voltage drop on long runs (over 200 ft) can drop a motor below its rated minimum. Use the pump manufacturer's wire chart, not the electrical code minimum.
- Pre-charge the tank. Set bladder pressure to 2 psi below cut-in before plumbing it in. Re-check annually.
- Constant-pressure systems. If pressure drop with multiple fixtures bothers you, ask about a variable-frequency drive (VFD) constant-pressure system instead of a standard switch + tank. Adds ~$700-$1,500.
- Sand or iron problems? Add the cost of a sediment filter or iron filter ($400-$1,800) before the pressure tank, not after.
Last updated: April 2026. Sizing logic based on NGWA Residential Water Well Performance Guidelines, Goulds / Grundfos / Franklin Electric residential pump charts, and Amtrol / Wellmate drawdown sizing tables.
Disclaimer: This tool is a sizing estimate, not an engineered design. Final pump and tank selection should be confirmed by a licensed well contractor or pump installer who has measured your well's static water level, drawdown, and yield. Electrical work must be done to local code.