How to use the Percentage Calculator
- Choose the type of percentage question.
- Enter the two values.
- Press Calculate.
Percentage Calculator formula
X% of Y = X × Y ÷ 100
X as % of Y = X ÷ Y × 100
% change = (New − Old) ÷ Old × 100
Worked example
- 20% of 500 = 20 × 500 ÷ 100 = 100.
- Marks: 432 out of 500 = 432 ÷ 500 × 100 = 86.4%.
- Price rose from ₹80 to ₹100: (100 − 80) ÷ 80 × 100 = 25% increase.
Frequently asked questions
How do I calculate percentage of marks?
Divide marks obtained by total marks and multiply by 100. Example: 432/500 × 100 = 86.4%.
How do I find X% of a number?
Multiply the number by X and divide by 100. 15% of 2,000 = 300.
How is percentage increase calculated?
Subtract the old value from the new value, divide by the old value and multiply by 100.
Is a 50% increase followed by a 50% decrease the same value?
No. 100 → 150 (+50%) → 75 (−50%). Percentages apply to different bases.
What is the difference between percent and percentage points?
If interest goes from 8% to 9%, it rose by 1 percentage point, which is a 12.5% increase.