How to use the reverse tip calculator
Enter bill amount, and amount paid. Choose the currency for your inputs and read the result as you change the values.
How it works and formula
Tip = amount paid − bill. Tip percentage = 100 × tip ÷ bill.
Worked example
| Bill amount | 80 |
|---|---|
| Amount paid | 96 |
Result
Tip $16.00 · 20.00%
Try a second calculation
Start with the USD worked example above and change only amount paid to 96. Select Calculate. Your result should read:
Tip $16.00 · 20.00%
Then enter 88 in the same field. Compare the result with the first scenario row. Holding every other input steady lets you see exactly how this one change affects the calculation.
Choosing your inputs
Use the amount due immediately before the new tip as the starting bill. Take the amount actually charged from the signed receipt or settled payment. A pending card authorization may still show the pre-tip total. If several diners paid, use the same diners’ bill and payment on both sides.
How to interpret the result
A higher percentage can mean more than a generous tip. Look for a delivery fee, a donation, or an adjustment included only in the final payment. The percentage describes the difference between your two numbers and cannot identify what created that difference.
Frequently asked questions
What if my payment includes another charge?
Remove any unrelated fee first. This tool treats the entire difference as a tip.