How to calculate an 18% tip
Multiply the amount you want to tip on by 0.18. A $50 bill produces a $9 tip, while a $100 bill produces an $18 tip. The calculator above applies the same formula and can also include optional tax, service charges, or multiple people.
The Emily Post Institute currently lists 15% to 20% of the pre-tax bill as a general U.S. guideline for sit-down wait service. An 18% calculation falls inside that range, but the tool is a math reference rather than a rule about what you must leave.
Quick 18% tip examples
| Bill | 18% tip | Total before tax or fees |
|---|---|---|
| $25 | $4.50 | $29.50 |
| $50 | $9.00 | $59.00 |
| $75 | $13.50 | $88.50 |
| $100 | $18.00 | $118.00 |
| $150 | $27.00 | $177.00 |
For mental math, calculate 20% and subtract 2%. On a $75 bill, 20% is $15 and 2% is $1.50, leaving an 18% tip of $13.50.
Before tax or after tax?
If you are following the U.S. restaurant reference above, the guideline is stated as a percentage of the pre-tax bill. Tipping on the after-tax amount produces a slightly larger result. Use the Tip Calculator With Tax when you want to compare both methods on the same check.
18% for a group bill
If everyone is splitting evenly, calculate the full total and then divide it between the number of people. Because real totals do not always divide evenly to the cent, the Split Bill Calculator uses exact remainder allocation instead of silently losing or adding a cent.
If diners ordered very different amounts, use the Uneven Split Bill Calculator so tax, tip, service charges, and shared items can be allocated more fairly.
Compare 18% with other percentages
The exact amount matters more than the label. Compare the 15% Tip Calculator, 20% Tip Calculator, and 25% Tip Calculator if you want to see how a few percentage points change the final total.