Percentage Calculator
Every percentage question.
Answered instantly.
What is% of?
is what % of?
Fromtois a
increased by% is(use a negative % to decrease — e.g. −10 for a 10% discount)
Four calculators in one: what is X% of Y; X is what percent of Y; the percentage change from X to Y; and Y increased (or decreased, with a negative %) by X%. Results update as you type.
Percentage formulas with examples
| Question | Formula | Example |
|---|---|---|
| What is X% of Y? | X ÷ 100 × Y | 15% of 200 = 30 |
| X is what % of Y? | X ÷ Y × 100 | 30 of 200 = 15% |
| % change from X to Y | (Y − X) ÷ X × 100 | 80 → 100 = +25% |
| Y increased by X% | Y × (1 + X ÷ 100) | 200 + 10% = 220 |
| Y decreased by X% | Y × (1 − X ÷ 100) | 2,000 − 15% = 1,700 |
Marks to percentage
To turn exam marks into a percentage, use "X is what % of Y": 432 out of 500 is 86.4%. For CGPA, many Indian boards and universities use CGPA × 9.5, but always check your institution's official conversion.
Frequently asked questions
- How do I calculate percentage change?
- (New − Old) ÷ Old × 100. From 80 to 100: (100 − 80) ÷ 80 × 100 = 25% increase.
- How do I calculate a discount?
- Use the last calculator with a negative percentage: 2,000 decreased by 15% (−15) = 1,700.