Percentage Calculator

Increase or decrease a number by a percentage, and calculate compound interest.

Initial value

Increase by (%)

Initial value

Decrease by (%)

Principal (initial amount)

Annual interest rate (%)

Years

Compounds per year

About Percentage Calculator

This calculator helps you with three common percentage-related tasks, all in one place.

The Increase by % tab adds a percentage on top of an initial value — useful for markups, tips, or projecting growth. The Decrease by % tab subtracts a percentage from a value — handy for discounts, markdowns, or depreciation. The Compound Interest tab calculates the future value of a principal amount given an annual interest rate, a number of years, and how many times per year the interest compounds.

Simply select a tab, enter your numbers, and click Calculate to see the result instantly.