Fixtures & Water Use
Everyday water use and fixture savings: daily household water use (occupants × gpd), old vs low-flow toilet water and cost savings, faucet / shower aerator savings, the water and heating cost per shower, water-supply fixture units (WSFU), and how much a dripping faucet or running toilet wastes. Savings tools are illustrative math on your figures, not financial advice.
Illustrative math, not advice: This is illustrative math on the figures you enter — not financial advice. Energy prices, water rates, usage and product performance vary; savings are never guaranteed.
Household Water UseEstimate your household's daily and monthly water use from the number of people and a per-person gallons-per-day figure — with formula, example and FAQ.Toilet SavingsSee how much water and money a low-flow toilet saves each year versus an older one, from gallons per flush, flushes per day and your own water price.Aerator SavingsEstimate the yearly water and dollar savings from a low-flow faucet aerator or shower head, based on old versus new GPM, minutes of use and your water price.Cost per ShowerWork out the water and water-heating cost of a single shower from flow rate, length, temperature rise and the water and energy prices you enter.Water Supply Fixture UnitsAdd up the water-supply fixture units (WSFU) for your home from a simple fixture count, then feed the total into peak-demand and supply-pipe sizing.Leak Water WasteSee how much water and money a dripping faucet or running toilet wastes over time, from a gallons-per-day rate, the number of days and your water price.
Every Fixtures & Water Use tool is calculated server-side — visible immediately — with its formula, a worked example and a reference table, and works on the prices you enter. Background reading is in the guides.