About the Toilet Paper Calculator
This toilet paper calculator estimates how long the rolls in your cupboard will last and when you will run out. Enter how many rolls you have, how many sheets are on each roll (it is printed on the pack), the number of people in your home and how many sheets each person uses a day. It returns the days and weeks your supply covers, the run-out date, and how many rolls your household goes through each week, month and year.
Use it to plan bulk buys, compare “mega” and “double” roll packs by sheet count rather than roll count, stock up for a trip, a storm season or an emergency kit, or settle how often your household really needs to restock. Set a planning period and it tells you how many rolls you need in total and how many more to buy on top of what you already have.
Usage varies widely between people, so treat the default of 50 sheets per person per day as a starting point and adjust it after you have timed how long a pack actually lasts. If people are out at work or school much of the day, lower the share of time at home.
With the default inputs, the your supply lasts is 40 days. Change any value above to recalculate instantly.
How to use the toilet paper calculator
- 1Count your rolls and check the sheets per roll on the pack.
- 2Enter the number of people in your household.
- 3Adjust the sheets per person per day and the share of time at home.
- 4Set a starting date to get the run-out date.
- 5Enter a planning period to see how many more rolls to buy.
Formula and method
The calculator converts everything to sheets, because roll sizes vary so much: “double” and “mega” rolls simply hold more sheets. Your supply in sheets is the rolls on hand times the sheets per roll, and your household’s daily use is the number of people times the sheets each uses per day, scaled by the share of time spent at home.
Dividing supply by daily use gives the days it lasts; the run-out date adds that many whole days to the starting date. Rolls per week, month (30.44 days) and year (365.25 days) come from the daily use divided by sheets per roll, and the rolls needed for a planning period are rounded up to whole rolls.
- people
- People using the bathroom at home
- sheets per person
- Average sheets each person uses per day
- sheets per roll
- Sheet count printed on the pack
Worked examples
24 rolls for a family of three
The pack holds 24 × 250 = 6,000 sheets. Three people at 50 sheets a day use 150 sheets, so it lasts 6,000 ÷ 150 = 40 days, running out on 10 November 2026. Covering 90 days takes 150 × 90 ÷ 250 = 54 rolls, so buy 30 more.
Couple out at work, mega rolls
Two people at 50 sheets, at home 60% of the time, use 60 sheets a day at home. Twelve 400-sheet rolls hold 4,800 sheets — 80 days. Over a year that is about 55 rolls, and 90 days needs 13.5, so 14 rolls.
Two-week emergency supply for four
Four people use 200 sheets a day, exactly one 200-sheet roll. Six rolls last 6 days; a 14-day kit needs 14 rolls, so buy 8 more.
Frequently asked questions
How many rolls of toilet paper does a person use per week?+
At about 50 sheets a day, one person uses 350 sheets a week — roughly 1.4 standard 250-sheet rolls, or around 70 rolls a year. Actual use varies a lot, so time a pack to find your own figure.
How long does a 12-pack of toilet paper last?+
With 250-sheet rolls, a 12-pack holds 3,000 sheets. At 50 sheets per person per day, that lasts about 60 days for one person, 30 days for two and 15 days for a family of four.
How do I compare double rolls and mega rolls?+
Ignore the roll names and compare sheets: check the total sheet count (rolls × sheets per roll) on each pack and divide the price by it. The calculator works in sheets, so any roll size can be entered.
How much toilet paper should I keep in an emergency kit?+
Plan for at least two weeks for everyone in your home. Enter 14 days as the planning period and the calculator shows how many rolls you need and how many to add to your current stock.
Why does my toilet paper run out faster than estimated?+
The daily sheet count is an average. Children learning to use the toilet, guests, colds and allergy season all raise use. If a pack lasts less time than predicted, increase the sheets per person per day.