Percentage Calculator
Calculate percentages easily: find X% of Y, determine what percent X is of Y, or compute the percentage change between two values.
How to Calculate Percentages
- Select the calculation mode: X% of Y, what percent X is of Y, or percent change.
- Enter the required values in the input fields.
- Click Calculate to get the instant result.
- Read the formula breakdown below the result to understand the math.
快速参考
| 从 | 到 |
|---|---|
| 1 minute | 60 seconds |
| 1 hour | 3,600 seconds |
| 1 day | 86,400 seconds |
| 1 week | 604,800 seconds |
| 1 year | 31,536,000 seconds |
| 1 year | 525,600 minutes |
使用场景
- •School homework — find 15% of 80 to calculate a test score deduction.
- •Shopping — determine how much you save when an item is 25% off.
- •Finance — calculate percentage change in monthly revenue to track business growth.
公式
Percent of a number: X% × Y = (X/100) × Y. What percent: (X/Y) × 100%. Percent change: ((New − Old) / |Old|) × 100%.
常见问题
How do I calculate X percent of a number?
Divide X by 100, then multiply by the number. For example, 15% of 200 = (15/100) × 200 = 30.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 is what % of 200? (30/200) × 100 = 15%.
How is percentage change calculated?
Subtract the old value from the new, divide by the absolute value of the old, and multiply by 100. A positive result means an increase, negative means a decrease.
What is the difference between percent and percentage points?
Percent is a relative measure (e.g., a 50% increase), while percentage points measure the arithmetic difference between two percentages (e.g., from 10% to 15% is 5 percentage points).