Bill splitter
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.
Input
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.
Output
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Highlights
- What you collect always matches the total
- Rounding a per-person share necessarily leaves a remainder. The guests’ share is rounded and the organiser’s is defined as the total minus everyone else, so the sum is exact no matter which unit or direction is chosen.
- Round to ¥100 or ¥500
- Nobody hands over single yen at the end of a meal. Guest shares can be rounded to whole hundreds or five hundreds, in whichever direction suits, so the figure is something people can actually pull out of a wallet.
- The organiser tilt is a number, not a guess
- Set how much more — or less — the organiser pays than one guest, and the split adjusts around it. The collected total still matches the bill exactly.
How to use it
Enter the total and the head count
Put the amount payable in the total field and the number of people, organiser included, in the people field. Commas and a currency symbol in the total are ignored.
Choose the rounding
Pick ¥1, ¥100 or ¥500 as the unit, then whether to round up, to the nearest or down. Each guest’s share is rounded to that unit.
Set the organiser’s share and read the result
Choose whether the organiser pays the same, more or less; the last two reveal a field for the tilt amount. The guest share, the organiser’s share and the collected total appear underneath, and Copy the result puts a paste-ready summary on the clipboard.
Reading the figures
- Why does the organiser pay a different amount?
- Because rounding always leaves something over. If everyone paid the same rounded figure the collected sum would miss the bill, so somebody has to carry the difference — and the person who already put the card down is the natural candidate. Larger rounding units widen the gap.
- Who gains from rounding up rather than down?
- Rounding up raises each guest’s share and lowers the organiser’s; rounding down does the opposite. Nearest sits between them. When the organiser has fronted the money, rounding up reduces the chance of coming up short.
- What is the tilt measured against?
- One guest’s share. Set the tilt to ¥2,000 with More and the organiser pays roughly ¥2,000 more than a guest. Roughly, because the guest share is rounded after the tilt is applied — the exact figure is shown as the gap between organiser and guest.
- What is the collected total for?
- It is the guests’ shares plus the organiser’s, and it always equals the bill. It exists as a check: the arithmetic guarantees the match, so a surprising figure there means the total was mistyped.
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.