If a basic tip calculator is not enough for you, try the Nerdy Tip Calculator. All the numbers are editable, so you can solve any bill and tip problems in a blink of an eye. While you edit a number, all the others are calculated for you in real time.
Also, keep pressed on a field for a second, and it gets rounded up to the next dollar. Very useful to make the tip or the bill share even.
It’s fast, it does math for you and…it’s free!
Screenshots for classy (less nerdy) and classic (more nerdy) themes.