速答：常见百分比变化

百分比变化公式：变化% = (新值 − 旧值) ÷ 旧值 × 100。正值为增长，负值为下降。下方为常见场景速查：

旧 → 新变化
100 → 120+20%
50 → 40−20%
1,000 → 1,250+25%
80 → 100+25%
200 → 150−25%
75 → 90+20%
3% → 5%（百分点）+2 pp / +66.7% 相对

参考：BLS CPI 通胀计算方法。

Percentage Change Calculator

Use this free percentage change calculator to find the increase or decrease between two values for price changes and growth rates.
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How Percentage Change Works

1

Find the Difference

Subtract the original value from the new value.

2

Divide by Original

Divide the difference by the absolute original value.

3

Multiply by 100

Convert to a percentage by multiplying by 100.

Common Applications

  • Price changes: How much did a stock or product price increase?
  • Growth rates: Revenue growth, population growth, or user growth
  • Performance: Test score improvement, weight loss/gain percentage
  • Budget variance: Actual vs. planned spending differences

百分比变化（参考资料）

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百分比变化计算器 - 增减/增长率/百分比点 推算 | CalcCentral