A toilet is gallons per flush × how many times it is used. A modern high-efficiency toilet is often 1.28 gallons per flush. Older 1.6 and pre-1990s 3.5 gpf bowls are still in a lot of houses. The expensive toilet is often not the new one — it is the silent flapper leak that refills all day.
Extra flushes, guests, and “flush every time” versus a household rule are habit math. A running toilet is leak math. Dye in the tank that shows up in the bowl without a flush is the cheap test.
This card is volume. It is not a plumber’s quote and not sewer-only billing, which some utilities price on a different line.
Set gallons per flush and uses per day. Use Leak / drip if the fill valve never really stops.
At 5.00 per 1,000 gallons, ten 1.28-gallon flushes are 12.8 gallons — about 0.06. Ten 3.5-gallon flushes are 35 gallons — about 0.18. A 24/7 flapper leak can dwarf both.
Dye test
Color in the tank that appears in the bowl without a flush is a flapper. That is Leak / drip, 24/7, not this flush counter.
Related
Usage estimate only — not a utility bill, load calc, or advice.