Toilet Paper Calculator
Calculate how many rolls of toilet paper a household uses and what it costs per year.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Estimate paper use from the daily sheets-per-person assumption you enter. The model uses 30.44 days per month and rounds annual roll purchases up to whole rolls; actual household use and product sizes vary.
Worked example
calculated with the default values below
People in the household 4 · Sheets per person per day 57 sheets · Sheets per roll 200 sheets · Price per roll 0.9 $ Rolls per month 34.7 rolls · Rolls per year 417 rolls · Cost per year 375.30 $ · Cost per sheet 0.0045 $
General background references
Disclaimer
These calculators provide planning estimates only. Building codes, wiring regulations and safety requirements differ by country and change over time, and nothing here replaces a licensed professional or a permit. For structural, electrical or gas work, follow local code and have the installation inspected.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
R = p × s × 30.44 ÷ q; C = 12 × R × c
- R
- Rolls per month
- p
- People
- s
- Sheets per person per day
- q
- Sheets per roll
- c
- Price per roll
- C
- Yearly cost
Daily sheets = people × sheets per person. Monthly rolls = daily sheets × 30.44 ÷ sheets per roll. Annual rolls = ceiling(monthly rolls × 12); yearly cost = whole annual rolls × price per roll. The user-entered daily use is an assumption.
Frequently asked questions
How is annual toilet-paper cost estimated?
Daily use is people × sheets per person per day. The model converts that to monthly use with 30.44 days, rounds the yearly roll requirement up to whole rolls, and multiplies by price per roll. The daily-use assumption is user-adjustable.