The protocol for tipping in America is confusing enough. We all agree that we should tip restaurant waiters and bartenders, but how much? And who else makes the cut? Barbers? Mailmen? Baristas? Though a PayScale study puts the median tip for waitstaffs at 19.5 percent, millennials only tip around 15, per a Harris Poll. And a study in American Demographics found that people simply tip what what they’re going to tip, regardless of the quality of their service.

But tipping is an even bigger clusterfuck abroad. Tipping rules and customs change from country to country, so forget about applying the already-nebulous American rules to your meals, tours and stays in foreign lands. The good news: An interactive map from Go Compare is here to solve your problems.

Tip Advisor,” which is a very good name for such an online tool, lets you search 49 countries to see exactly how much (and more importantly, if) you should tip the international strangers who perform various services for you, like waiters and taxi drivers.

I just learned that in France, for example, you should leave one Euro for every 20 Euros spent in cafes, and five percent of the bill in fancier restaurants. In Thailand, meanwhile, you’re expected to leave behind any loose change in coins as a tip.

The map is pretty fascinating, and it even includes how to say “thank you” in most languages, because you’re a good American and you should always express your gratitude. Play around with the tool here.