Calculate what is X% of Y, what percent X is of Y, and the percentage increase or decrease between two numbers.
Anyone working out discounts, tips, tax, grades, or statistics quickly.
Pick the calculation
Choose the box that matches your question: percent of a number, one number as a percent of another, or a percentage change.
Enter your numbers
Type the values into the fields. Results update instantly as you type.
Read the result
The answer appears in bold. Percentage decreases show in red, increases in green.
Percentage questions come in a few standard forms, and mixing them up is a common source of mistakes. This tool separates the three most common ones — X% of Y, X as a percent of Y, and the percentage change between two numbers — so you always apply the right formula.
Shopping & discounts
Work out how much a percentage off saves you, or the percentage discount from two prices.
Grades & scores
Convert marks into percentages, e.g. 47 out of 60 as a percentage.
Finance & stats
Calculate percentage growth or decline between two figures like revenue or followers.
Percentage change = (new − old) ÷ |old| × 100. The tool does this for you in the third box.
Yes. A drop from 100 to 80 shows as −20%, and an increase from 80 to 100 shows as +25%.
No. All maths runs in your browser.