Percentage Calculator
This percentage calculator helps you quickly calculate percentages, percentage increases, percentage decreases, and percentage differences between numbers. It is useful for discounts, markups, financial comparisons, and everyday math.
Calculate Percentage
Result
Enter values to calculate percentage.
What Is a Percentage?
A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin per centum, meaning "per hundred." Percentages are used everywhere — from sales tax and discounts to grades, interest rates, and survey results — because they make proportions easy to compare regardless of the total size.
The three most common percentage calculations are: (1) What is X% of Y? (e.g., what is 15% of $80?); (2) X is what percent of Y? (e.g., 12 is what percent of 80?); and (3) What is the percentage change from X to Y? (e.g., a price rose from $50 to $60 — what's the percent increase?).
Percentage Formulas
How to Use This Calculator
- Choose the calculation type you need from the options provided.
- Enter the required values in the input fields.
- Click Calculate to get your result instantly.
- Use the Reset button to clear the fields and start a new calculation.
Frequently Asked Questions
How do I calculate a percentage increase?
To find the percentage increase from an old value to a new value, subtract the old value from the new value, divide by the old value, then multiply by 100. For example: a price goes from $80 to $100 — that's ((100 − 80) / 80) × 100 = 25% increase.
How do I find the original price after a percentage discount?
If you know the discounted price and the discount percentage, divide the sale price by (1 − discount/100). For example, if a jacket costs $68 after a 15% discount, the original price was $68 / 0.85 = $80.
What does "percentage points" mean vs "percent"?
These are easy to confuse. If an interest rate rises from 2% to 3%, it increased by 1 percentage point — but that's a 50% relative increase. "Percentage points" describe absolute differences between two percentages, while "percent change" expresses the relative change.