Reverse Tip Calculator

This calculator works backwards from a total bill to separate out the tip, telling you the original pre-tip amount, the dollar value of the tip, and the tip percentage. Most tip calculators add a tip to a bill, but sometimes you have the final total and need to reverse the maths: checking a receipt where a tip or service charge was already added, splitting a tipped total fairly between people, sorting out an expense claim where the tip needs to be itemised, or simply working out what percentage was added to a bill. While tipping is not customary in New Zealand the way it is overseas, it does appear on some hospitality bills, on travel, and increasingly on card terminals that prompt for a tip, so being able to unpick a total is genuinely useful. You enter the total amount you paid, the tip percentage that was included, and the number of people sharing, and the calculator returns the pre-tip amount, the tip in dollars, and the cost per person for the full total. The key idea is that the total equals the original bill plus the tip percentage of it, so to reverse it you divide the total by one plus the tip rate rather than simply subtracting the percentage, which is a common mistake that gives the wrong answer. Use it to verify a charge, to settle who owes what when a group splits a tipped bill, or to convert an overseas receipt back to the base price. The pre-tip amount and the tip always add back to the total you entered. This is an exact calculation to take the guesswork out of a tipped bill.

To reverse a tip, divide by one plus the tip rate, not subtract the percentage. Pre-tip plus tip add back to the total. An exact calculation.