Percentage Calculator
Calculate percentages, percentage change, and what percentage one number is of another.
How to Use This Tool
- Choose the type of percentage calculation using the buttons.
- "X% of Y" — calculates what X percent of Y equals.
- "X is what % of Y" — finds what percentage X represents of Y.
- "% Change" — calculates the percentage increase or decrease from one value to another.
- "Add %" and "Subtract %" — adds or removes a percentage from a base value (useful for tax and discount).
- Enter your values and the result appears immediately.
How It Works
All calculations are performed in your browser using standard arithmetic. Percentage of: result = (X / 100) × Y. What percent: result = (X / Y) × 100. Percentage change: result = ((to − from) / |from|) × 100. Add/subtract: result = value × (1 ± rate / 100).
Frequently Asked Questions
How do I calculate a discount?
Use "Subtract %" mode. Enter the original price as the base value and the discount percentage. The result is the discounted price.
How do I calculate tax-inclusive price?
Use "Add %" mode. Enter the pre-tax price as the base value and the tax rate as the percentage. The result is the total price including tax.
What does a negative percentage change mean?
A negative percentage change means the value decreased. For example, going from 100 to 80 gives a −20% change.