What is % of ?
X is what percent of Y?
Percentage Increase/Decrease
About Percentage Calculator
Welcome to our free online percentage calculator! This powerful yet simple tool is designed to help you calculate percentages quickly and accurately for any purpose. Whether you're figuring out discounts while shopping, calculating tips at restaurants, determining grade percentages, or analyzing financial data, our calculator makes it easy.
Our percentage calculator offers three essential calculation modes to handle all your percentage needs. Simply enter your numbers, and get instant results without any complex formulas or manual calculations.
Frequently Asked Questions (FAQ)
What is a percentage?
A percentage is a way of expressing a number as a fraction of 100. The word "percent" comes from the Latin "per centum," which means "by the hundred." Percentages are commonly used to represent proportions, compare values, and show changes over time. They are denoted by the symbol "%".
For example, if you scored 85 out of 100 on a test, your score is 85%. If 30 out of 150 students in a school wear glasses, then 20% of students wear glasses.
How do you calculate a percentage?
To calculate a percentage, you divide the part by the whole and multiply by 100. The basic formula is: (Part ÷ Whole) × 100 = Percentage
For example, if you want to find what percentage 25 is of 200: (25 ÷ 200) × 100 = 12.5%
How to calculate percentage increase or decrease?
To calculate percentage change, use this formula: ((New Value - Old Value) ÷ Old Value) × 100
If the result is positive, it's a percentage increase. If negative, it's a percentage decrease. For example, if a price increases from $50 to $65: ((65 - 50) ÷ 50) × 100 = 30% increase
Why are percentages important?
Percentages are used extensively in everyday life and across various fields. They help us understand discounts and sales prices, calculate taxes and tips, analyze test scores and grades, interpret statistics and data, track financial growth and losses, understand interest rates, compare proportions and ratios, and measure changes over time.
Understanding percentages is essential for making informed decisions in personal finance, business, education, and many other areas of life.
Can I use this calculator on mobile?
Yes! Our percentage calculator is fully responsive and works perfectly on all devices including smartphones, tablets, laptops, and desktop computers. The interface automatically adjusts to your screen size for the best user experience.
Is this calculator free to use?
Absolutely! Our percentage calculator is 100% free to use with no registration required. You can perform unlimited calculations without any restrictions or hidden costs.
Common Use Cases
Shopping & Discounts
Calculate how much you save with percentage discounts. If a $120 item has a 25% discount, you can quickly find out you're saving $30 and paying only $90.
Restaurants & Tips
Easily calculate tip amounts. For a $50 meal with a 20% tip, you'll know to add $10, making your total $60.
Academic Grades
Convert your test scores to percentages. If you got 42 out of 50 questions correct, that's 84% - a solid B grade in most grading systems.
Business & Finance
Track revenue growth, profit margins, expense reductions, and investment returns. Calculate percentage changes in stock prices or analyze financial statements.
Health & Fitness
Monitor weight loss or gain percentages, track body fat percentage changes, and measure improvement in fitness metrics.
How to Use This Calculator
Calculator 1: What is X% of Y?
Use this calculator when you need to find a specific percentage of a number. For example, "What is 20% of 150?" Simply enter 20 in the first field and 150 in the second field, then click Calculate.
Calculator 2: X is what percent of Y?
Use this calculator to find what percentage one number represents of another. For example, "25 is what percent of 200?" Enter 25 in the first field and 200 in the second field.
Calculator 3: Percentage Increase/Decrease
Use this calculator to find the percentage change between two numbers. For example, if a price changed from 100 to 120, enter 100 in the "from" field and 120 in the "to" field to find it increased by 20%.