This is an interim report, 8 rolls completed, on my ongoing study to determine a baseline for a one year supply of toilet paper.
Because toilet paper varies greatly in quality, construction, and number of sheets in a roll your mileage may vary. In addition individual usage varies because of technique, upbringing, health and what you eat so this is intended as a suggested starting point. I look forward to many of you conducting your own experiments.
Test parameters:
1. A single individual is the test subject.
2. The test paper selected is Charmin Ultra Strong packaged in Mega Rolls, supposed to equal four regular rolls.
3. Target is average use for a one year period.
4. Date of each roll start and finish are recorded along with elapsed number of days, then total elapsed days are divided by total rolls used to arrive at a Days Per Roll for a single individual or the DPRPP (days per roll per person) number.
The DPRPP number can then be used to estimate usage for any size group or determine the length of time an existing supply will last.
After 8 rolls used the average DPRPP is 35.5 for this specific brand and roll size. Therefore 365 divided by 35.5 equals 10 1/4 Mega Rolls for a one year supply. Additional data and analysis will be made available at the end of the full test. This is simply an interim figure for consideration if things get worse before the test is complete.