Percentage Calculator
Calculate any percentage quickly and easily. Perfect for discounts, tips, grades, business calculations, and more with step-by-step explanations.
Percentage Calculator
What is X% of Y?
X is what % of Y?
X is Y% of what?
Percentage Increase/Decrease
Common Applications
Discounts & Sales
Calculate savings on purchases
Investment Returns
Track profit and loss percentages
Tips & Service
Calculate restaurant tips
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Understanding Percentages
Percentage simply means "per hundred" or "out of 100". It's a way to express a fraction with a denominator of 100. When we say 25%, we mean 25 out of 100, or 25/100, or 0.25.
Basic Formula:
What is X% of Y?
When you see the % symbol, think of it as dividing by 100. So X% of Y means (X/100) Ã Y.
Formula:
Examples:
Example 1:
What is 25% of 80?
(25/100) Ã 80 = 20
Example 2:
What is 15% of 200?
(15/100) Ã 200 = 30
A is what % of B?
This finds what percentage A represents of the total value B.
Formula:
Examples:
Example 1:
30 is what % of 120?
(30/120) Ã 100 = 25%
Example 2:
45 is what % of 180?
(45/180) Ã 100 = 25%
A is X% of what?
This finds the whole value when you know the part and the percentage.
Formula:
Examples:
Example 1:
15 is 30% of what?
(15 Ã 100) / 30 = 50
Example 2:
24 is 40% of what?
(24 Ã 100) / 40 = 60
Percentage Increase/Decrease
To calculate the percentage change between two values, we find the difference and express it as a percentage of the original value.
Formula:
Examples:
Increase Example:
From 50 to 75
((75-50)/50) Ã 100 = 50% â
Decrease Example:
From 100 to 80
((80-100)/100) Ã 100 = -20% â