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Reverse Tip Calculator

Split a tip-inclusive total back into bill and tip.

Result

$75.00
$11.25

How it is calculated

You enter the total that was paid, tip included (total), and the tip rate you believe was added, in percent (rate). Because the tip was calculated on the original bill, total = bill × (1 + rate / 100), so the tool reverses it: bill = total / (1 + rate / 100) and tip = total − bill. Both results are shown as dollar amounts rounded to cents. The tool does not work out the tip percentage for you; it needs you to supply it. Negative totals or rates give no result, and a rate of 0 returns the whole total as the bill. Tax is not treated separately, so if the tip was figured on a pre-tax amount, the split will differ.

Worked example

A card statement shows $86.25 and you know a 15% tip was included. The total is 115% of the bill, so divide by 1.15: 86.25 / 1.15 = $75.00. That is the original bill. The tip is the difference: 86.25 − 75.00 = $11.25. Check: 15% of 75.00 is 11.25, which added to 75.00 gives back 86.25. The tool shows a bill of $75.00 and a tip of $11.25.

Try this example →

Common mistakes

  • Taking 15% off the total, which gives $73.31 here. The tip was added on top of the bill, not on top of the total, so you must divide by 1.15 to find the bill.
  • Entering the rate as a decimal such as 0.15. The field is in percent, so 0.15 is treated as a 0.15% tip and the bill barely drops.
  • Guessing the tip rate. The answer depends entirely on the percentage you enter, so use the figure actually added, for example from the receipt, not the usual custom.
  • Ignoring that the tip may have been charged on the pre-tax amount. If tax is in the total, the bill shown here includes that tax, so the tip share can look off.
  • Using it on a total that had no tip. A rate above zero will invent a tip; if no tip was added, set the rate to 0.

About this calculator

Instead of starting from the bill and adding a tip, this calculator works backward from the total amount actually paid and the tip percentage you enter to figure out what the original bill and the tip amount must have been. It is the same relationship as a standard tip calculation, just solved for a different unknown.

It comes in handy when someone only has the final charged amount, say from a card statement or a split payment app, and knows or suspects the tip rate that was added (such as 15%, 18% or 20%). It shows the bill before tip and how much of the total was tip, and you can try a few rates to see which one gives a round bill. It is also useful for separating the bill from the tip when a group paid a single lump total.

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Comments (1)

  • Editorial team

    When the rate is unknown, test the usual suspects against the same total and look for a clean bill. For 86.25, a 15% tip gives a bill of 75.00, while 18% gives 73.09 and 20% gives 71.88. Only the first lands on a round figure, so that is the likelier guess, though a round number is a hint and not proof. Which tip rates are common where you live, and do restaurants there add a service charge?

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