Percentage Calculator
Free online percentage calculator. Calculate the percentage of a number, find what percent one number is of another, compute percentage increases and decreases, and solve any percentage problem instantly.
What is X% of Y?
How to Calculate Percentages
A percentage represents a part out of every 100 units. To calculate X% of a number Y, multiply Y by X and divide by 100. This calculator allows you to solve the three most common types of percentage problems quickly and accurately.
Percentage Formulas
Percentage of a number: (X / 100) x Y. What percent is X of Y: (X / Y) x 100. Percentage change: ((New - Old) / Old) x 100.
Frequently Asked Questions
How do I calculate 15% of a number?
To calculate 15% of a number, multiply the number by 0.15. For example, 15% of 200 is 200 x 0.15 = 30.
How do I calculate a percentage discount?
Subtract the discounted price from the original price, divide by the original price, and multiply by 100. For example, if something costs $100 and is on sale for $80, the discount is ((100 - 80) / 100) x 100 = 20%.
What is the difference between percentage change and percentage difference?
Percentage change measures the increase or decrease from an original value to a new value. Percentage difference compares two values relative to their average, which is useful when neither value is the clear "original."