Knowing the appropriate level of gratuity can be tricky, and it gets even more difficult abroad, where tipping practices widely vary. Forbes offers some help, noting, for instance, that for a cab ride in South America, rounding up the fare to the next dollar is an acceptable tip, while in Europe or an African city 10% is expected.
Add 5-10% in Europe even when a service charge is added, the magazine urges. In Japan, tipping is seen as rude in any situation, where in China it’s customary to add 3% to the bill at restaurants; in Hong Kong, 15% is expected. And world-round, $2-$5 is an acceptable amount to tip a concierge for a simple request.