Percentage Calculator
Calculate any type of percentage question instantly — what percent of a number, percentage increase or decrease, and what percentage one number is of another.
What Does This Tool Do?
Percentages come up constantly — in discounts, taxes, tips, grade calculations, statistics, and more. This tool handles the three most common percentage calculations: finding a percentage of a number, calculating percentage change between two values, and finding what percentage one number is of another.
Key Features
How to Use This Tool
- Choose the type of percentage calculation you need.
- Enter the numbers in the fields provided.
- The result appears instantly — copy it for use in your work.
How It Works
Each calculation type uses a different formula: "What is X% of Y" uses Y × (X/100). "% change from A to B" uses ((B-A)/|A|) × 100. "What % is A of B" uses (A/B) × 100. All results are rounded to a sensible number of decimal places.
Common Use Cases
Frequently Asked Questions
How do I calculate percentage increase?
Use the "% change from A to B" calculator. Enter the original value as A and the new value as B. A positive result means an increase; negative means a decrease.
What is the formula for percentage?
Percentage = (Part / Whole) × 100. For example, if 30 out of 50 students passed, the pass rate is (30/50) × 100 = 60%.
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