Percentage Calculator
About Percentage Calculator
Our free Percentage Calculator covers the three most common percentage questions: what X% of a number is, what percent one number is of another, and the percentage increase or decrease between two values - all calculated instantly as you type.
What is X% of Y?
X is what percent of Y?
Percentage change from X to Y
Whether you're working out a discount, a tip, exam scores, or the change between two figures for a report, each calculator updates live with no need to press a submit button, making it fast to check several numbers in a row.
How to Use the Percentage Calculator
- Pick the calculation you need: percentage of a number, what percent one number is of another, or percentage increase/decrease.
- Enter your values into the relevant fields.
- Read the result instantly as it updates with each keystroke, with no submit button to click.
- Switch to a different calculation type at any time without losing your other entries.
Who uses this tool: Shoppers use it to work out a discounted price or compare sale percentages before checking out, students and teachers use it to convert raw scores into grades, and small business owners use the percentage-change calculator to track month-over-month revenue or expense shifts for a quick report without opening a spreadsheet formula. Servers and diners use it to work out a fair tip on a restaurant bill, and anyone reviewing a survey or set of results uses the percent-of calculator to quickly turn raw counts into shareable percentages.
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Frequently asked questions
How do I calculate a percentage increase or decrease?
Enter the original and new value, and the calculator finds the percentage change automatically - a positive result means an increase, a negative result means a decrease.
How do I find what percentage one number is of another?
Use the "X is what percent of Y" mode - enter both numbers and it divides and converts to a percentage for you instantly.
Can this calculate percentages for things like discounts and tips?
Yes - the same percent-of-a-number calculation works for discounts, markups, tips, and tax, though our dedicated Tip Calculator is quicker if you just need a bill split.
