If it is an older model, about 2-3 gallons.
Newer, water saving models typically use less than one gallon per flush.
About 1.6 gallons per flush
Modern toilets use 1.6 gallons of water to flush and older models used 3 gallons
its a myth it doesn't
Old toilets 5.5 gallons, the minimum on new ones is 1.6 gallons
Modern toilets use 1.28 or 1.6 gallons per flush
It takes approx 2 to 5 gallons of water. Depending on the age of the toilet and the type of flush you have.
depends on the kind of toilet and where you live. today's standard in America is 1.6 gallons. more efficient models will use 1.28 gallons. some even have a dual-flush option, 0.8 gallons for #1 and 1.6 gallons for #2.
3.4 gallons it's the new standard
It takes 5-7 gallons of water per flush.
You use anywhere from 1 cup of water to 5 cups of water to flush the toilet. This is per time you flush the toilet.
Compared to a 30 year old toilet? An amazing amount (I just installed two such toilets, replacing 30-year-old models). These are dual flush, and in the low flush mode - perfectly adequate for 70% of flushes - they use 1.3 gallons. The old toilets used almost 4 gallons per flush. A saving of 2.7 gallons per flush, times (how many??) flushes per day, times 365: You are easily talking thousands of gallons a year.
about 1.3 gallons per flush