Tip calculator
A tip is a percentage of the bill. The only real question is whether it goes on the pre-tax or post-tax total.
%
%
Total to pay
99.71
- Tip
- 15.21
- Each person pays
- 24.93
- Tip per person
- 3.80
- Tip if calculated before tax
- 14.18
- Difference between the two
- 1.03
- Rounded up to the next whole unit
- 100.00
Show the working
- Bill = 84.5
- Tip = 18
- People splitting it = 4
- Tax already in the bill = 7.25
- Tip = 84.5 * 18 / 100 = 15.21
- Total to pay = 84.5 + 15.21 = 99.71
- Each person pays = 99.71 / 4 = 24.9275
- Tip per person = 15.21 / 4 = 3.8025
- pretax_bill = 84.5 / (1 + 7.25/100) = 78.7879
- Tip if calculated before tax = 78.7879 * 18 / 100 = 14.1818
- Difference between the two = 15.21 - 14.1818 = 1.028 18
- Rounded up to the next whole unit = ceil(99.71) = 100
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- tip = bill x tip percentage
- per person = (bill + tip) / people
Tipping on the pre-tax subtotal is the traditional rule and saves the tip percentage of the tax.