About the Percentage Calculator

Percentages are used everywhere in daily life — from shopping discounts and tax calculations to grade scoring and financial analysis. This calculator provides three essential percentage operations in one convenient tool. The first mode finds a specific percentage of any number (e.g., 15% of 200 = 30). The second mode determines what percentage one number is of another (e.g., 30 is 15% of 200). The third mode calculates the percentage change between two values (e.g., from 80 to 100 is a 25% increase).

The formulas are straightforward: for "X% of Y" it is (X/100) × Y; for "X is what % of Y" it is (X/Y) × 100; and for percentage change it is ((New − Old) / |Old|) × 100. All calculations happen in real time as you enter your numbers, giving you instant results without clicking any buttons.