Tip Split helps you work out a fair tip and split a bill between any number of people, in the currency you're actually paying in. Enter the bill total, choose a tip percentage (or set your own), and set how many people are splitting it — the total and per-person amount update instantly.
Tipping norms vary a lot by country: in some places a service charge is already included and extra tipping is optional, while in others it's expected and forms a large part of how staff are paid. The Tipping Guide tab above covers what's typical in 20 countries, so you're not guessing when you're travelling.