Once you’ve decided how much you intend to tip, the Tip Calculator app can help you with the math.
Just enter the total amount of the bill (eg 30) and enter the percentage (15) and you will know what to tip (5.50). If several of you are going to split the bill, you can also press Split – to see both the amount and the tip per person.
For Android, the app is available in both a free and a paid version, while the free version is missing for IOS.
Download Tip Calculator for Android
Download Tip Calculator for IOS