About This Tool
What is 百分比计算器?
A tool for performing common percentage calculations. Supports three modes: 'What percent is A of B', 'What is A% of B', and 'Percentage change from A to B'. Useful for discount rates, growth rates, and ratio calculations.
How to Use
- Select the calculation mode (ratio, value, or change rate).
- Enter the required values A and B.
- Click 'Calculate'.
- The result is displayed instantly.
Key Features
- Three percentage calculation modes
- Clean, intuitive interface
- Precise calculations to decimal points
- Instant result output
Tips
- Use the 'change rate' mode for calculating discount percentages.
- ROI calculations work well with the 'change rate' mode.
- Use the 'ratio' mode to find profit margins relative to cost.
百分比计算器
进行常见的百分比计算
计算 B 的 A 百分之几
Frequently Asked Questions
如何计算折扣百分比？▼
使用'百分比变化'模式。输入原价为A，售价为B。例如，商品从100美元降到75美元，结果是-25%（25%折扣）。负号表示减少。
如何找出一个数是另一个数的百分之几？▼
使用'A是B的百分之几'模式。例如，考试100分得了85分，输入A=85和B=100得到85%。适用于成绩计算、完成率和市场份额分析。
如何从百分比计算小费或税额？▼
使用'B的A%是多少'模式。例如，计算50美元餐费的18%小费，输入A=18和B=50得到9美元。计算税费时，A输入税率，B输入税前金额。