标准百分比公式：百分比 = 部分 ÷ 总数 × 100。下方表格列出最常见的百分比问题；如需其他数字请使用计算器：
| 表达式 | 结果 |
|---|---|
| 200 的 15% | 30 |
| 25 是 200 的多少？ | 12.5% |
| 50 增加到 65 | +30% |
| 80 减少到 60 | -25% |
| 1,000 的 10% | 100 |
| 200 × 0.08 | 16 |
| $80 商品 25% 折扣 | $60 |
| $50 餐费 18% 小费 | $9 |
参考：NIST 计量单位与换算指南。
Percentages are a way to express a number as a fraction of 100.
Common Applications:
Quick Tips:
Common Tip Rates:
Remember that percentages are always calculated relative to the original amount unless specified otherwise.
Select from percent of a number, percent increase, percent decrease, percentage points, or tip calculation. Each mode is tuned for the most common use case.
Type the values relevant to your problem. The calculator auto-detects the right formula and shows the math step by step.
See the final answer plus the formula and the steps used. Useful for checking your own work or learning the underlying math.
For related calculations, try our tip calculator.
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