This percentage calculator answers the three most common percent questions in one place. Enter two numbers and instantly see what percentage one is of the other, what a given percentage of a number equals, and the percent increase or decrease between the two values.
It is useful for working out discounts, tips, tax, markups, grades, growth rates and everyday comparisons. Instead of doing the math by hand, type the numbers and let the results update automatically as you type.
Everything runs locally in your browser. Your numbers are never uploaded or stored, so it is private, free and works instantly on any device, including mobile.
Disclaimer: results are rounded for display and may not be suitable for financial or legal decisions.
Multiply the number by the percentage and divide by 100. For example, 20% of 50 is 10.
Subtract the old value from the new value, divide by the old value and multiply by 100.
Yes, the page is mobile friendly and can be installed to your home screen.