Commas and a currency symbol are ignored.
Including the organiser — five means the organiser plus four others.
Each guest’s share is rounded to that unit, and the organiser absorbs whatever the rounding leaves.
Enter a total and a number of people.
Divide a total between any number of people, rounded to ¥1, ¥100 or ¥500. The organiser absorbs whatever the rounding leaves, so what you collect always adds back up to the original total — and the organiser can be set to pay more or less than everyone else.
Questions
Does the head count include the organiser?
Yes. Entering five means one organiser and four guests, and the per-guest figure is annotated with the number of guests it applies to.
How do I handle someone who is not drinking?
The tilt only adjusts one person, so split the calculation in two: decide what the non-drinkers pay, subtract it from the total, and run the remainder against the remaining head count.
The organiser’s share went negative.
That happens with a large rounding unit and few people, or a tilt bigger than one share — the guests are collectively paying more than the bill. A warning appears; use a smaller unit or a smaller tilt.
Where does the rounded-up surplus go?
It reduces what the organiser pays. To set it aside instead — as a float for next time, say — add that amount to the total before calculating, and it is collected from the guests along with everything else.
Are the amounts sent anywhere?
No. Everything is calculated in the page, with nothing uploaded and nothing stored. Closing the tab clears it; only the text you copied stays with you.