Percentage & Discount Calculator
Three calculators in one: percentage of a value, percentage change between two numbers, and final price after a discount.
Three everyday percentage problems
Percentages show up everywhere, from calculating a tip to comparing sale prices. This calculator covers the three most common cases: finding a percentage of a number, measuring how much a value changed in percentage terms, and applying a discount to a price.
Calculated instantly, on your device
All math runs directly in your browser as you type — there is no server call and no delay.
Frequently asked questions
How is percentage change calculated?
We divide the difference between the new and old value by the absolute value of the old number, then multiply by 100.
Can I use negative numbers?
Yes, the percentage change calculator handles negative starting values correctly.
Does the discount calculator handle multiple discounts?
It applies one discount percentage at a time; for stacked discounts, apply the first, then use the resulting final price as the new original price for the second calculation.
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