What is X% of Y?
X is what % of Y?
Percentage Increase / Decrease
The Best Free Percentage Calculator Online
Whether you are calculating a tip at a restaurant, figuring out a sale discount, or analyzing business growth, percentages come up everywhere. The GadgetsFocus free online Percentage Calculator gives you three essential tools in one page to handle every common percentage question instantly.
Three Calculators in One
- What is X% of Y? — Great for calculating discounts. For example, “What is 20% of $85?” gives you $17. This tells you the discount amount on a product.
- X is what % of Y? — Helpful for grades and scores. For example, “36 is what % of 40?” gives you 90%. This tells you the percentage score on a test.
- Percentage Increase / Decrease — Essential for business analytics. For example, if your website went from 1,000 visitors to 1,500 visitors, the tool tells you that is a 50% increase.
How to Use
Simply type your numbers into the input boxes for the calculation you need and click “Calculate.” The green answer box will update instantly. All math is performed locally in your browser with zero server calls.
Frequently Asked Questions (FAQ)
How do I calculate a percentage manually?
The formula is: (Part / Whole) × 100 = Percentage. For example, if you scored 45 out of 50 on a test: (45 / 50) × 100 = 90%.
What is the difference between percentage increase and decrease?
Both use the same formula: ((New Value – Old Value) / Old Value) × 100. If the result is positive, it is an increase. If the result is negative, it is a decrease. Our tool handles this automatically and labels the result accordingly.