Percentage Calculator
Calculate percentages instantly — find X% of Y, what percentage X is of Y, percentage change between two values, or add/subtract a percentage. Free.
🧮 Math & Finance Tools
Free
Browser-based
What is X% of Y?
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X is what % of Y?
is what % of
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Percentage Change (from → to)
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Increase / Decrease a Number by %
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Percentage Formulas
| Mode | Formula |
|---|---|
| X% of Y | Y × (X ÷ 100) |
| X is what % of Y | (X ÷ Y) × 100 |
| % change from A to B | ((B − A) ÷ |A|) × 100 |
| Increase N by X% | N × (1 + X ÷ 100) |
| Decrease N by X% | N × (1 − X ÷ 100) |
Common Examples
| Question | Mode to Use | Example |
|---|---|---|
| Sale discount | Decrease by % | $80 decreased by 25% = $60 |
| Tax calculation | Increase by % | $100 increased by 20% = $120 |
| Score percentage | X is what % of Y | 45 is what % of 60 = 75% |
| Price change | % change | From $50 to $65 = +30% |