Many people don’t know that servers in most restaurants don’t earn minimum wage in the United States; tipped employees are actually paid $2.13 (in some states it is more), which is why servers rely on tips. For those of us who don’t want to spend time figuring out the proper tip, Turbo Tip Calculator is the handy app that will do the math for you.

Turbo Tip is easy to use. Just enter the amount of the bill at the top, and the amount of the tip will appear. At the bottom, you can adjust the percentage if the server did an amazing job or if the server ignored you after delivering your meal. If you are with others, you can change the split number and end any arguments about who owes what.

Other neat features of the app include a list of the sales tax rates of U.S. states, what the expected tip amount is in different countries, and a currency exchange. You can change the currency in the tip section as well if you want to see how much in U.S. dollars your meal costs so you can keep to your travel budget.

Turbo Tip Calculator, by Adysseus, is free, rated 4+, requires iOS 6.0 or later, and is compatible with iPhone, iPad, and iPod touch.