Home Well Water Storage Tank Sizing Calculator
Choosing the right size pressure tank keeps your well pump from short-cycling and extends its lifespan. Enter your household's peak water demand, your pump's flow rate, and how long you want the pump to rest between cycles to get a recommended drawdown and tank size.
About this calculator
Calculate the ideal pressure/storage tank size for your well system based on household demand, pump flow rate, and desired run-time between pump cycles.
Frequently Asked Questions
What is 'drawdown' in a pressure tank?
Drawdown is the amount of water a tank can deliver between the pump's cut-in and cut-off pressure settings, typically about 1/3 of the tank's total volume.
Why does a bigger tank help my pump last longer?
A larger drawdown means fewer pump starts per hour, which reduces motor wear and heat buildup, extending pump life significantly.
What cycle time should I target?
Most manufacturers recommend at least 1 minute of continuous run time per cycle to avoid motor overheating; some pumps need longer.