Percentage Calculator
Free online percentage calculator for the three everyday cases: what is B% of A, what percent B is of A, and the percentage change from A to B. Handy for shopping discounts, growth rates, tips and ratios — results appear instantly. CalculatorRuns locally
Use this tool
How to use
- Choose the type of calculation.
- Enter the two numbers it asks for.
- The result updates automatically, with the formula shown in words.
Frequently asked questions
How are increase and decrease calculated?
Choose “Percentage change”, enter the original and the new value; a positive result is a percent increase and a negative one a decrease.
How does this relate to sale discounts?
A 20%-off sale means you pay 80% of the original. Our Discount Calculator works directly with the percent off.
How many decimals are shown?
Up to a few decimals as needed, plenty for everyday and budgeting use.