Percentage Calculator
Calculate percentages, increases, decreases, and differences instantly
Percentage Calculator
Choose calculation type and enter values to get instant results
About Percentage Calculator
Calculation Types
- • Percentage of a Number: Find X% of Y
- • Percentage Increase: Calculate increase from original to new value
- • Percentage Decrease: Calculate decrease from original to new value
- • Percentage Difference: Difference between two numbers as percentage
- • Find Original Number: Reverse calculation from percentage
Common Use Cases
- • Discounts & Sales: Calculate sale prices
- • Tax Calculations: Add tax to prices
- • Grade Calculations: Calculate test scores
- • Financial Growth: Investment returns
- • Statistics: Data analysis and comparisons
Percentage Formulas
| Calculation | Formula |
|---|---|
| Percentage of Number | (Percentage × Number) ÷ 100 |
| Percentage Increase | [(New - Original) ÷ Original] × 100 |
| Percentage Decrease | [(Original - New) ÷ Original] × 100 |
| Percentage Difference | |A - B| ÷ [(A + B) ÷ 2] × 100 |
| Find Original | Number ÷ (Percentage ÷ 100) |
Quick Tips
- Use decimal numbers for precise calculations
- Negative percentages work for decreases
- All calculations update in real-time
- Examples available for each calculation type
Frequently Asked Questions
To calculate X% of Y, use the formula:
(X × Y) ÷ 100. For example, to find 20% of 150: (20 × 150) ÷ 100 = 30.
Percentage increase measures growth from an original value to a new value. Percentage difference compares two numbers without assuming which is original, using the average as base.
Yes! Use the "Find Original" calculation type. If you know the percentage and the result, it calculates the original number before the percentage was applied.