The tip, the total, and what each person owes when you split the bill.
In the US, table service is typically tipped 15–20% of the pre-tax bill — 18% is a common default, and 20% is standard for good service. The tip is calculated on the bill itself; whether you tip on the pre-tax or post-tax amount is up to you, though pre-tax is the traditional rule. When splitting, this calculator divides the full total (bill plus tip) evenly across the group, which keeps things simple even if the tip percentage produces an awkward number. For the underlying math, see the percentage calculator.