How tip calculator works
This tip calculator takes your bill amount, a tip percentage, and the number of people splitting the bill. An optional sales-tax field lets you choose the tip base: by default the tip is computed on the pre-tax subtotal (the classic convention), or on the post-tax total if you switch the selector. The tip is the tip base times the percentage; the total adds the bill, tax, and tip, and splits by the number of people.
Tip percentages vary by country and service. In the United States, 15 to 20 percent is typical for sit-down restaurant service; 18 percent is a common default. In many European and Asian countries, service is included or a smaller tip (5 to 10 percent) is customary. Adjust the percentage to match your local norm.
The calculator rounds monetary values to two decimal places (cents). When splitting, each person share is rounded independently, so the sum of individual shares may differ by a cent or two from the total. This is a normal rounding artifact.