％ Percentage Calculator
🔒 An toàn & Phía máy khách
Three common percentage operations in one place: what is X% of Y, X is what percent of Y, and percent change from X to Y. Switch modes from the dropdown — the input labels update so you don't have to remember the formula.
How to use
- Pick the mode that matches your question:
- What is A% of B? — e.g., "20% of 150" → 30
- A is what percent of B? — e.g., "30 is what % of 150" → 20%
- Percent change from A to B — e.g., "100 → 125" → +25%
- Enter the two numbers and click Calculate.
Percent change uses the formula (B − A) / A × 100. A drop from 100 to 75 is −25%; rising back from 75 to 100 is +33% — gains and losses are not symmetric.