Most percentage calculators do one thing. This one has 10 modes on one page: X% of Y, X is what % of Y, percentage change, add or subtract %, tip with bill split, discount, grade/score, find the original number, percentage difference, and fraction to percent. Every input accepts decimals. Your calculation history is saved on your device, and each mode comes with quick tips. It is fast, simple and 100% free, with no signup and no ads in your way.