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Percentage Calculator
The percentage questions people actually ask, each with its own calculator: a percent of a number, what percent one number is of another, the change between two values, discounts and marks.
What is X% of Y?
450
X is what percent of Y?
75%
Percentage change
+25%
Increase
Increase or decrease by a percentage
55,000
Discount
Pay ₹1,399.3
You save ₹599.7
Marks percentage
87.6%
Percentage formulas
- X% of Y = Y × X ÷ 100
- X as a % of Y = X ÷ Y × 100
- % change = (new − old) ÷ old × 100
- Increase Y by X% = Y × (1 + X ÷ 100), and decrease = Y × (1 − X ÷ 100)
Percent vs percentage points
If an interest rate goes from 8% to 9%, it rose by 1 percentage point, but by 12.5% in relative terms (1 ÷ 8). News reports and bank notices mix these up often, so it's worth checking which one is meant.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 18% of 2,500 is 2,500 × 18 ÷ 100 = 450.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 80 to 100 is (100 − 80) ÷ 80 × 100 = 25% increase. Note that going back from 100 to 80 is a 20% decrease, not 25%.
How do I calculate my marks percentage?
Divide the marks you obtained by the total marks and multiply by 100. 438 out of 500 is 87.6%. If your board uses CGPA, check its official conversion formula, as it differs between boards and universities.
Is a 10% increase followed by a 10% decrease the same as no change?
No. ₹100 increased by 10% is ₹110, and 10% off ₹110 is ₹99. Each percentage applies to a different base, which is why successive changes don't simply cancel out.