Percentage Calculator

The Percentage Calculator solves the percentage questions that come up most often: what is X% of Y, what percentage X is of Y, the percentage increase or decrease between two numbers, and tip amounts. Each scenario has its own clearly labelled mode, and the answer appears the instant you enter your values, with no Calculate button to press.

It is handy for shoppers working out a sale discount, students checking homework, restaurant-goers splitting a bill, and analysts comparing before-and-after figures. Because the common cases are laid out separately, you never have to remember which formula applies or risk rearranging it incorrectly under time pressure.

All of the maths happens in the browser, so nothing is uploaded and the results are instant. There is no install and no account to set up, which makes it a reliable everyday calculator you can open the moment a percentage question appears — whether you are at a checkout, reviewing a report or planning a budget.