Toilet Paper Calculator (rolls per week, month & year for your household)

Understanding the toilet paper calculator — concept and principle

This calculator estimates how much toilet paper a household uses per week, month and year, and how long the rolls you have will last. Use it to plan bulk buying, compare pack sizes, or check stock before a trip or a holiday.

Rolls per day = sheets per day ÷ sheets per roll; stock lasts 12 ÷ 0.45 days.

How it is calculated

Sheets per day = people × uses per person per day × sheets per use

Rolls per day = sheets per day ÷ sheets per roll

Rolls per week = rolls per day × 7; per month = × 365.25 ÷ 12; per year = × 365.25 (rounded up)

Days your rolls last = rolls on hand ÷ rolls per day

Days one roll lasts = 1 ÷ rolls per day.
Sheets per roll is printed on the pack and differs a lot between regular, double and mega rolls.

The principle

Consumption is a simple rate: how many sheets leave the roll each day. Multiplying people, uses and sheets per use gives that rate, and dividing by the roll size turns sheets into rolls. Counting sheets instead of rolls is the key, because "rolls" are not a fixed unit: a pack labelled "12 double rolls" may hold far more paper than 12 regular rolls. The 365.25-day year averages leap years, and the monthly figure is one twelfth of that.

Worked example

Default inputs: 3 people, 6 sheets per use, 5 uses per person per day, 200 sheets per roll, 12 rolls on hand.

Sheets per person per day = 6 × 5 = 30; household = 3 × 30 = 90 sheets.
Rolls per day = 90 ÷ 200 = 0.45.
Per week = 0.45 × 7 = 3.15, shown as 3.1; per month = 0.45 × 365.25 ÷ 12 = 13.7.
Per year = 0.45 × 365.25 = 164.4, rounded up to 165 rolls.
Stock lasts 12 ÷ 0.45 = 26.7, shown as 27 days; one roll lasts 1 ÷ 0.45 = 2.2 days.

Each point is the calculator re-run with only “Sheets per roll (see the pack)” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Sheets per roll (see the pack)	Rolls per week
50	12.6
100	6.3
150	4.2
200	3.1
250	2.5
300	2.1
400	1.6

How to read the result

Use rolls per month to choose a pack size and the days your stock lasts to time the next purchase. Compare packs by price per 100 sheets, not per roll. If the result seems high, check the per-use figure; time spent at work or school lowers home use, while children, illness or guests raise it.

Common mistakes

Comparing packs by roll count when the sheets per roll differ.
Using uses per day that ignore time away from home.
Treating the yearly figure as exact; it is rounded up to a whole roll.
Forgetting guests and holidays when stocking up.

Keep in mind: Sheets per use and uses per day are example values, not survey data. Count your own for a few days for a reliable estimate.

Frequently asked questions

How many rolls does a family of 4 use per month?

It depends on habits and roll size. With the defaults here per person, 4 people would use about 18 rolls of 200 sheets a month.

Is a double roll really twice as much?

Not always. Check the sheet count and sheet size on the pack.

How do I compare prices?

Divide the price by the total sheets in the pack and multiply by 100 to get the price per 100 sheets.

Sources: Arithmetic from household figures; 365.25-day average year

Checked 9 Nov 2026. Arithmetic from your own household figures; 365.25-day average year. Sheets per use and uses per day are example values, not survey data.

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