Toilet Paper Calculator
Result
Rolls you need
- Packs to buy
- 3
- Sheets per day
- 216.0
- A pack lasts
- 13.9 days
How much toilet paper a household gets through is arithmetic once you know three things: how many people, how often each of them goes, and how many sheets a visit takes. This toilet paper calculator multiplies those together, divides by the number of sheets on your roll, and rounds up — because 25.9 rolls means buying 26. It also turns the same numbers around to answer the other half of the question: how long a pack lasts, and how many packs to buy for the period you are shopping for. The one input worth checking before you trust the result is the sheet count on your roll. It is the number that varies most between products, and it is why published figures for how much toilet paper a person uses disagree with each other by a factor of four.
Rolls and pack life by household size
| Household | Sheets per day | Rolls per month | Rolls per year | Days per pack |
|---|---|---|---|---|
| 1 | 54 | 7 | 79 | 55.6 |
| 2 | 108 | 13 | 158 | 27.8 |
| 3 | 162 | 20 | 237 | 18.5 |
| 4 | 216 | 26 | 316 | 13.9 |
| 5 | 270 | 33 | 395 | 11.1 |
| 6 | 324 | 39 | 474 | 9.3 |
| 7 | 378 | 46 | 552 | 7.9 |
| 8 | 432 | 52 | 631 | 6.9 |
Every row uses the same assumptions as the page's defaults — 6 visits a person a day, 9 sheets a visit, 250-sheet rolls, 12 to a pack — and changes only the household size, so the table shows the shape of the arithmetic rather than a set of independent estimates. The sheets-per-day column is exactly proportional to the first, which is the least interesting thing in the table; the last column is the useful one, because pack life collapses much faster than people expect. A pack is a fortnight for four people, a week for eight, and two months for one, and it is worth reading against how often you actually shop. Change any of the assumptions above and every row moves — this table is a starting point for the input fields, not a replacement for them.
Formula
sheets per day = people × visits per person per day × sheets per visit, and rolls needed = ceil(sheets per day × days in the period ÷ sheets per roll)
- people
- How many people are using this toilet paper — a household, or the occupants of one bathroom at work
- visits per person per day
- How many times each person goes in a day. Paper is not used on every visit, and this page does not try to tell the two apart — count the visits that use paper
- sheets per visit
- How many sheets one visit takes. Published figures cluster between 8 and 9
- sheets per roll
- How many sheets are on one roll. Most packs print it; it is the manufacturer's own number, and there is no standard for it
- rolls per pack
- How many rolls are in the pack you buy. This is what turns a roll count into something you can order
Use it before a big shop or a bulk order, when the question is whether a pack is a week's supply or a quarter's. The two numbers worth reading together are the rolls you need and the days a pack lasts: if a pack lasts 14 days and you shop monthly, you want three of them, and if it lasts 60 days then buying two is a year of storage you have to find room for. It is also the quickest way to compare two packs of different sizes — a 24-roll pack of 150-sheet rolls and a 12-roll pack of 250-sheet rolls look very different on the shelf and are not: the second has more paper in it. What the arithmetic cannot tell you is what your household actually does. It has no idea about guests, a stomach bug going round, or the roll that gets used to mop up a spill, and those are exactly the weeks that empty the cupboard.
Worked examples
A household of four, stocking up for a month
- Sheets per day: 4 people × 6 visits × 9 sheets = 216
- Sheets for the month: 216 × 30 days = 6,480
- Rolls: 6,480 ÷ 250 = 25.92, rounded up to 26
- Packs: 26 ÷ 12 = 2.17, rounded up to 3 — two packs is 24 rolls, which is two short
- One pack lasts: 12 × 250 ÷ 216 = 13.9 days
A household of four gets through very close to a roll a day, which sounds wrong the first time you see it and is not: 216 sheets a day against a 250-sheet roll is what the arithmetic says, and it is why a 12-roll pack is a fortnight rather than a season. If that feels too fast for your household, the number to change is sheets per visit — dropping it from 9 to 6 takes the month from 26 rolls to 18.
One person, on rolls with fewer sheets
- Sheets per day: 1 × 4 × 8 = 32
- Sheets for the year: 32 × 365 = 11,680
- Rolls: 11,680 ÷ 150 = 77.87, rounded up to 78
- Packs: 78 ÷ 24 = 3.25, rounded up to 4
- One pack lasts: 24 × 150 ÷ 32 = 112.5 days
The habits here are lighter than in the first example, and the roll count is still three times higher — because the roll is smaller. Keep the same person on 250-sheet rolls and the year takes 47 rolls instead of 78. This is the comparison published usage figures keep getting wrong: two sources can agree exactly on how many sheets a person uses and disagree by a factor of two on how many rolls that is, because one of them quietly assumed a bigger roll.
Limitations
Every number here comes from inputs you supplied, so the result is only as good as they are, and the weakest one is sheets per visit — there is no standard for it and no measurement behind it. Published figures for how much toilet paper one person uses in a day range from about 48 to 90 sheets, and the roll counts built on top of them range from 27 to 104 rolls a year; the sheets-per-day spread is people's habits, and the rolls-per-year spread is mostly the roll size the source assumed rather than the habits at all. Treat the defaults on this page as an example household, not as an average. The sheet count is also not always available: rolls are labelled by sheet count in some markets and by weight or by length in others, and if yours is sold by weight you cannot read the number off the pack — the FAQ explains how to get at it from the roll's weight, the sheet size and the ply. A month here is 30 days, and a quarter is 91, so a monthly figure will run about 3% short in a 31-day month. Nothing in the arithmetic knows about the things that actually move consumption: guests, illness, a second bathroom, a roll used for cleaning rather than for its stated purpose, or a change in who is at home during the day. Finally, the page counts sheets and nothing else — it does not know what a roll costs, so it cannot tell you whether the bulk pack is cheaper, only whether you will get through it before the next shop.
Frequently asked questions
- How much toilet paper does one person use a day?
- Published figures disagree, and it is worth knowing why before picking one. The most widely quoted is about 57 sheets a person a day, which is roughly 9 sheets over 6 or 7 visits and is attributed to Charmin. A UK survey of a thousand people came out at about 56, and a study cited by MIT worked out at 8.6 sheets across 6.6 visits — also around 57. Against those, a 1993 survey of 1,200 households reported about 90 sheets a day. The honest reading is that 50 to 60 sheets is a reasonable starting point for an adult at home, that individual habits vary a lot, and that the number you should actually use is the one you can check against your own shopping.
- How many rolls per month does a household need?
- It depends almost entirely on the roll. Take a household of four at 6 visits and 9 sheets each: 216 sheets a day, 6,480 a month. On 250-sheet rolls that is 26 rolls a month; on the same paper in 150-sheet rolls it is 44. Both figures are right, which is why a rolls-per-month number without a sheet count attached to it means very little. Enter the sheet count from the pack you buy and the answer above is the one that applies to your shopping.
- How long does a pack last?
- Divide the pack's total sheets by the household's daily sheets. A 12-roll pack of 250-sheet rolls is 3,000 sheets, and a household of four using 216 a day finishes it in 13.9 days — about a fortnight. A single person using 32 sheets a day gets 112 days out of a 24-roll pack of 150-sheet rolls. The result panel shows this directly, and it is usually the more useful of the two answers: the roll count tells you what to put in the trolley, and the days tell you whether you will be back for more before the next shop.
- How many packs to buy to last a month?
- Round up, and round up twice — once for rolls and once for packs, because packs come in whole units. The household of four above needs 26 rolls for the month, and packs of 12 give 2.17 packs, so three packs. Two packs would be 24 rolls and about two days short, which is exactly the kind of gap that shows up at the worst moment. Buying the third pack is not waste: it is 12 rolls that keep, and it moves the next purchase out by a fortnight.
- Does household size really scale the answer?
- Linearly, yes — twice the people is twice the sheets — but the effect on how long a pack lasts is what surprises people. One person on a 12-roll pack gets roughly two months; four people get about a fortnight; eight people get a week, because the same pack is being divided among eight people's habits rather than one person's. The reference table on this page lays out 1 to 8 people on the same assumptions if you want to see the shape of it. Anything beyond that is the same multiplication with a bigger first term.
- What if my roll does not say how many sheets it has?
- You can work it out from the roll's weight and the sheet size. Sheets = roll weight ÷ (sheet length × sheet width × sheets per area × ply). Working in metres and grams per square metre: a 140 g roll of 4-ply paper, sheets 13.8 cm by 10 cm, at a paper weight of 16 g per square metre, comes to 140 ÷ (0.138 × 0.10 × 16 × 4) ≈ 158 sheets. The paper weight is the figure the manufacturer's own specification quotes, and 12 to 20 g per square metre per ply covers most toilet tissue. If you would rather not do that, count the sheets on one roll once and use that number — rolls of the same product are consistent, and one count lasts until you change brand.
References
- Toilet paper — roll formats, ply, and the per-person usage figures quoted from manufacturers (including the 57-sheets-a-day figure attributed to Charmin) — Wikipedia
- How much toilet paper should a person use? — a manufacturer's per-visit figures, including the difference between men and women — Cottonelle (Kimberly-Clark)