Everyday Math

2 calculators and 2 guides in this category.

Calculators

Quickly work out percentages: what is X% of Y, X is what percent of Y, and percent increase or decrease.

Calculate the tip and split the total bill between any number of people in seconds.

Percentages trip people up more than they should. Here are the three percentage problems you actually face and simple ways to solve each one.

Tipping in the US can be confusing. Here's a clear, situation-by-situation guide to how much to tip — and when you don't have to.