Which Percentage Calculation Do You Need?

"Percentage" questions come in more varieties than people usually expect — this tool bundles seven of them into one place so you don't have to remember which formula applies to which question.

Which calculator do you actually need?

• X% of Y — "What is 15% of 80?" Use this for tips, taxes, or any straightforward percentage-of-a-number question.
• Percentage increase / decrease — "A price went from $40 to $52, what's the percentage change?" Use this for tracking growth, price changes, or performance over time.
• Percentage difference — Comparing two values against each other without treating one as the "original," useful when neither number is clearly the baseline.
• Marks percentage — "I scored 78 out of 90, what percentage is that?" Common for grades and test scores.
• Discount calculator — "An item is 30% off $85, what's the final price?"
• Reverse percentage — "$68 is 85% of what original number?" Useful when you know the result and need to work backward.

Step-by-step

1. Select the calculation type that matches your question.
2. Enter your numbers.
3. Read the result, which updates live as you type — and copy it with the copy button if you need it elsewhere.

Ready to calculate? Open the free Percentage Calculator.