Percentage Calculator

Free Online Percentage Calculator

Calculate any percentage operation instantly. Five calculation modes cover every common scenario.

Calculation Modes

What % of? — A is what percent of B? (e.g., 25 is what % of 200? → 12.5%)

% of Number — X% of Y = ? (e.g., 15% of 300 = 45)

% Increase — Increase X by Y% (e.g., 100 + 20% = 120)

% Decrease — Decrease X by Y% (e.g., 100 − 20% = 80)

% Change — From A to B = ?% change (e.g., 80 to 100 = +25%)

Common Use Cases

Discounts — Calculate sale prices (original price − discount %).

Tips — Figure out 15%, 18%, or 20% tip quickly.

Tax — Add sales tax to a price.

Performance — Calculate improvement or regression percentages.

Finance — Interest rates, ROI, profit margins.

Quick Reference

| Percentage | Fraction | Decimal |

|-----------|----------|---------|

| 10% | 1/10 | 0.1 |

| 25% | 1/4 | 0.25 |

| 33.3% | 1/3 | 0.333 |

| 50% | 1/2 | 0.5 |

| 75% | 3/4 | 0.75 |