Came up with the idea

We were chatting in Weekend London Slack channel about the toilet roll hoarding craziness, and the subject came up "how much toilet paper does one actually need?".

Of course, it's pretty easy to calculate, you just stick the numbers in a spreadsheet and do the maths.

So what about simply sharing this online, and people could just adjust as required? Hmmm... good idea, but not sure if that marketable....