Percentage Calculator
This free Percentage Calculator lets you quickly calculate percentage values, percentage increase or decrease, and percent change between two numbers. It's perfect for shopping discounts, finance, statistics, fitness tracking, school work, and everyday math.
About Percentage Calculations
Percentages express values as parts of 100 and are used for comparisons, growth, discounts, and ratios. This tool supports basic and advanced operations — including percent change and increase/decrease.
How to Use This Calculator:
- Select the type of calculation (e.g., "X% of Y").
- Enter the numbers in the fields provided.
- Click "Calculate" to get your result instantly.
- Review the example if you need guidance on interpreting the result.
Examples:
- What is 20% of 150? → 30
- 30 is what percent of 200? → 15%
- Increase 200 by 15% → 230
- Decrease 200 by 10% → 180
- Percent change from 50 to 75 → 50% increase
Frequently Asked Questions
To find a percentage, divide the part by the whole and multiply by 100. For example, 30 out of 120 is (30 ÷ 120) × 100 = 25%.
Percentage increase shows how much a value has grown compared to the original amount. It’s calculated as: ((new − old) ÷ old) × 100.
Percentage decrease shows how much a value has dropped compared to the original amount. It’s calculated as: ((old − new) ÷ old) × 100.
Percent change measures the increase or decrease between two values. A positive result means an increase, and a negative result means a decrease.