This app calculates helps you calculating the right tip. Enter the net amount, tap on a percentage and you are done. You can modify the tip and the total sum with the tap of a finger create an even sum for either tip or total.
Available for:
Free version for iPhone and iPad
Android phones and tablets
Free version for Android phones and tablets
More features:
- default percentage
- currency symbol
http://tipcalc.speedymarks.com