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.
About 1 roll per person per week is a common estimate — adjust for your household.
Mega rolls often run $1.00–$1.50 each. Check your last receipt if you're not sure.
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. Owners commonly report cutting toilet paper use 50–90%. Set the slider to whatever feels realistic for your house, and we'll do the payback math on two real products.
Owners commonly report cutting toilet paper use 50–90%.
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 for about $40, 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 60 months 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: the payback math assumes your toilet paper savings land at the reduction rate you picked — 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 of the math above.
Frequently asked questions
How much toilet paper does the average person use?
There is no single official number, but about 1 roll per person per week is a common estimate — roughly 50 to 100 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.
Do bidets really cut toilet paper use that much?
Owners commonly report cutting toilet paper use somewhere between 50% and 90%. Most people still use a small amount for drying off, unless they have an electric seat with a warm-air dryer. That is why the calculator uses a slider instead of promising one fixed number — pick the reduction you think is realistic for your household.
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?
Non-electric attachments like the LUXE NEO series have very few moving parts and commonly last several years. Electric bidet seats often run 5 to 10 years with normal use. Either way, the hardware usually outlives its payback period by a wide margin.
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, and payback = the product's price divided by monthly savings, rounded up to whole months. Change any input and every number updates.