Get a planning GPM range for household demand — not a pump selection — from the number of bathrooms and other major uses running at the same time.
Disclaimer: All results are estimates for planning only. County and state rules govern — check with your local authority.
How to use this estimator
- Enter the number of bathrooms in the home.
- Enter how many other major uses may run at the same time (0-3) – for example laundry, dishwasher, or irrigation.
- Click Estimate GPM range and use the result as a planning range only.
What the result means
This tool gives a planning household-demand range in gallons per minute (GPM). It is not a pump selection, and it does not calculate horsepower or total dynamic head (TDH). Well yield, depth, TDH, and pressure tank size must be confirmed by a professional before you buy or install a pump.
Worked example: 2 bathrooms, 1 other use = 10-15 GPM planning range.
Frequently asked questions
Does this tool choose my pump?
No. It gives a household-demand GPM range for planning. Pump selection needs well yield, depth, TDH, and pressure, which this tool does not measure.
Why a range, not one number?
Demand changes with which fixtures run at once. A range is more honest for planning than a single number based on one use pattern.
What if my well yield is lower than the range?
Then the well, not the pump, limits supply. A professional should test yield and advise on storage, controls, or other options.
Does this include irrigation or a large garden?
Only as one of the other uses counted at the same time. Heavy irrigation needs its own assessment and should not be assumed from this household range.
Can I use this range to buy a pump online?
Not alone. Use it as a starting point for a professional conversation, with your well report, depth, and pressure needs in hand.
When to call a professional
Call a licensed well and pump professional for low yield, low pressure, a new pump, a replacement, cycling, air in the water, or any electrical work. Well depth and TDH must be confirmed before a pump is selected.
Related tools: Water Softener Size Calculator – All free tools