Tip Calculator
Bill, tip percentage, number of people. Rounds up to a whole currency unit if you want the numbers to be readable.
Tip
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Total
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Each person pays
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Worked example
An 84.50 bill at 18% adds 15.21, for 99.71 total. Split three ways that is 33.24 each — or 34.00 with rounding up.
The arithmetic is trivial; the useful part is seeing the per-person figure before the card arrives. Splitting an uneven total after the fact is where the argument starts.
On rounding
Rounding each share up means the group overpays slightly, by at most one currency unit per person. Rounding the total instead and dividing produces shares with fractions of a cent, which nobody can pay.