Estimate the uses you specify
This tool totals showers and toilet flushes only. It excludes faucets, laundry, leaks, outdoor use and other household demand. Choose a saved source rating or enter an assumed or measured value; neither choice converts this calculation into a measurement of your home.
Read the difference correctly
The displayed Scenario B minus Scenario A is the difference between all selected inputs. If duration, use frequency and product ratings all change, the result is not the isolated water-saving effect of one product. Keep the use inputs equal to study a rating change; keep the rating equal to study a habit change.
Daily shower volume = GPM × minutes per shower × showers per day. Daily toilet volume = single GPF × single uses, or full GPF × full uses + reduced GPF × reduced uses. The seven-day and thirty-day estimates multiply the daily total by 7 and 30; they are fixed periods, not calendar-month forecasts.
No water price, bill reduction or installed performance is inferred. Before choosing values, read shower flow context and single/dual flush mode handling. Use the interactive controls to change one assumption at a time.
Source: EPA WaterSense product directory, saved 30 October 2026; this analysis uses the fixed catalog release described in Sources and research methods. These historical observations do not establish current certification or product availability. Fixture Flow Atlas is independent of EPA; no affiliation or endorsement is claimed.