Plumbing & Water calculators
Size a water heater to your household and work out pool and tank volumes in gallons.
Plumbing & Water
Pool Volume Calculator
Calculate pool volume in gallons for rectangular, round and oval pools. Get cubic feet, surface area, average depth and the pump flow for an 8-hour turnover.
Open calculatorPlumbing & Water
Water Heater Size Calculator
Size a water heater from your peak hour hot water use. Get peak demand in gallons, the standard tank size that covers it, and the tankless GPM you need.
Open calculatorPlumbing & Water estimating FAQ
What can I estimate with the plumbing & water calculators?
Size a water heater to your household and work out pool and tank volumes in gallons. Each tool shows the formula and a worked example so you can see exactly how the result is produced.
Do these tools include labor and tax?
Unless a calculator explicitly asks for a price that includes labor, results cover materials and quantities only. Add labor, tax, and delivery from local quotes for a full budget.
Are the calculators free?
Yes — all calculators are free, run in your browser, and require no account.