Percentage Calculator - Percent, Change & Discounts
Calculate a percentage of a number, convert a ratio to a percentage, find percentage change, and work out sale prices after a discount.
UNDERSTANDING PERCENTAGES
Percentages are everywhere—from shopping discounts to tax calculations.
Our calculator handles all common percentage math problems.
Choose the mode that matches the question: find a percentage of a number, turn a part-to-total ratio into a percentage, measure change from an original value, or calculate a discounted price and amount saved. Each mode labels the required values and updates its result from those inputs.
Percentage change divides the difference by the original value, so it is not defined when the original value is zero. Percentage-of results are displayed to two decimal places, change results to one decimal place, and discount results with a dollar sign; use the underlying formula or a suitable financial system when you need different precision or currency formatting.
COMMON USES: Discounts: Calculate sale prices. Tips: Determine service gratuity. Growth: Measure increase or decrease. Ratios: Convert fractions to percentages.
Frequently Asked Questions
- How do I calculate a discount?
- Multiply the price by the discount percentage and subtract from the original.
- What is percentage change?
- The difference between two values divided by the original value.
- Can I calculate tips?
- Yes, use the 'Percentage of Number' tab.
- Is it free?
- Yes, completely free and runs in your browser.
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