Toilet Paper Calculator: What Your Household Spends Per Year
Toilet paper feels cheap because you buy it a few rolls at a time. Add it up across a household and a decade, and it is real money. Punch in your numbers below — everything updates as you type, and nothing is stored or sent anywhere.
Published estimates run from about 1 roll per person a week to nearly 3. Adjust for your household.
Not sure? Divide what you paid for your last pack by the number of rolls in it.
What changes with a bidet
A bidet washes with water first, so you use toilet paper for drying at most — some people skip it entirely. There is no reliable universal figure for how much paper that saves, which is why this part is a slider. Halving your use is a conservative planning assumption if you'll still pat dry with paper, so that's where it starts; move it to fit your habits and we'll do the payback math on two real products. Our bidet toilet paper savings guide explains why published figures disagree so widely.
Lower it if you'll use the bidet only some of the time; raise it if you'll dry with a towel or warm air.
LUXE Bidet NEO 110
Pays for itself in about 7 months at your numbers.
Slides under the seat you already have and taps the toilet's own water line — a working bidet with no electricity or plumber, and it fits both round and elongated two-piece toilets.
Check price on Amazon →Alpha Bidet JX2
Pays for itself in about 86–93 months (roughly 7.2–7.8 years) at your numbers.
Our best-overall electric bidet seat: warm water, heated seat, and warm-air dry at a mid-range price, sold in both round and elongated versions so it fits either bowl shape.
Check price on Amazon →Honest note: these payback lines count toilet paper savings only, at the reduction you picked, and real results vary by household. A bidet does add a little to your water bill, but it's typically a few dollars per year, small enough that we leave it out. An electric seat like the JX2 also draws power for its heated seat and warm water, which stretches its payback further, so buy one for comfort rather than as a money-saver. Our guide to what a heated bidet seat costs to run has those numbers.
Frequently asked questions
How much toilet paper does the average person use?
There is no single official number, and published estimates disagree widely. BidetMate, a bidet seller, puts the average American adult at roughly one roll a week, or about 50 rolls a year, while Statista's Consumer Market Outlook estimate is 141 rolls per person per year. Real usage varies a lot with household habits, roll size, and how much time people spend at home, which is why this calculator lets you adjust the number instead of assuming one for you.
How much does a bidet really cut toilet paper use?
It depends on your household, and published figures vary too widely to plan on. Most people still pat dry with a little paper after washing and keep a roll for guests, so paper use drops substantially but rarely to zero. Start from what you actually spend, and if you'll still dry with paper, plan on cutting it in half.
Does a bidet raise your water bill?
Barely. A typical bidet wash uses around an eighth of a gallon of water. Even with a family using it several times a day, that usually works out to a few dollars per year on a US water bill. Making toilet paper also takes water, so the net water picture generally favors the bidet.
How long do bidet attachments last?
It depends mostly on build quality: a durable attachment can give many years of use, while a flimsy one can fail within months. Our guide to how long bidet seats last covers each type and what wears out first. For this calculator, the useful comparison is lifespan against payback. At the starting inputs (2 people, 1 roll per person a week, $1.00 a roll, a 50% cut), the LUXE NEO 110 repays its price in about 7 months, well inside the life of a decent attachment. The Alpha Bidet JX2 takes about 86–93 months (roughly 7.2–7.8 years) on paper savings alone, before the electricity it uses, which is why we treat an electric seat as a comfort purchase rather than a money-saver.
Is this calculator's math exact?
The math is exact; the inputs are estimates. The formula is: people × rolls per person per week × 52 = rolls per year, then rolls per year × price per roll = cost per year. Bidet savings = cost per year × your chosen reduction percentage. Payback = the low and the high end of each product's typical price range divided by monthly savings, rounded up to whole months, which is why it shows as a range. Change any input and every number updates.