How tip splitter works
Enter the bill subtotal, a tip percentage, an optional sales-tax percentage, and how many people are splitting. Pick a quick tip (15%, 18%, 20%, or 25%) or type your own. The tool adds the tax to the subtotal, computes the tip on the pre-tax subtotal by default (or on the taxed amount if you turn that on), and divides the grand total across the people.
For groups where some ordered more than others, enter per-person weights (for example 1,2,3). Each weight sets that person's share of the subtotal, tax, and tip, so someone with weight 3 pays three times as much as someone with weight 1. Leave the weights blank for an equal split.
Turn on cash round-up to round each person's share up to the nearest whole dollar — handy when paying with cash so nobody owes coins. The tool shows the rounded total and the small extra (overage) that rounding adds on top of the exact total, which effectively becomes a little extra tip for the server.