Percentage Calculator — Calculate %, Increase & Decrease
Calculate percentages instantly — find a percentage of a number, what percent one number is of another, or the percentage change between two values.
20% of 150 = 30
What it does
A multi-mode percentage calculator that handles the three most common percentage problems: a percent of a value, the percent one value is of another, and the percent change between two values.
When to use it
Use it for sales tax, tips, discounts, grade weighting, fitness goals, budget changes and any quick % math.
Benefits
- Three calculation modes in one tool
- Instant results as you type
- Mobile-friendly numeric inputs
- Plain-language explanation of each result
Example
20% of 150 = 30. A jump from 80 to 100 is a 25% increase.
Frequently asked questions
- How do I calculate a percentage of a number?
- Multiply the number by the percentage and divide by 100. For example, 20% of 150 is (150 × 20) / 100 = 30.
- How is percentage change calculated?
- (new − old) / old × 100. A negative result means a decrease.
- Is the calculator accurate for finance?
- Yes for everyday math. For regulated financial calculations always confirm with your accountant.
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