Free Math Tool

Free Percentage Calculator

A percentage calculator solves common percent math such as percent of a number, percent change, discounts, taxes, tips, increases, and decreases. Enter your values to get the answer, formula, and plain-English steps in one place.

Quick Examples

Percent of

Calculate the percentage

Result

36

15% of 240 is 36.

Formula and steps

15 / 100 x 240 = 36

  1. 1Convert 15% to 0.15.
  2. 2Multiply 0.15 by 240.
  3. 3The answer is 36.

Percentage FAQ

Common percentage questions

These quick answers are written for homework, shopping, budgeting, spreadsheets, and everyday percent problems.

What is a percentage calculator?

A percentage calculator solves common percent math such as percent of a number, percent change, percentage increase, percentage decrease, discounts, tax, and tips.

How do you calculate a percentage of a number?

Divide the percent by 100, then multiply by the number. For example, 15% of 240 is 0.15 times 240, which equals 36.

How do you calculate percentage change?

Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is an increase and a negative result is a decrease.

How do you calculate a discount percentage?

Multiply the original price by the discount percent divided by 100, then subtract that amount from the original price.

Can this calculator handle decimal percentages?

Yes. You can enter decimals such as 8.25 for sales tax, 12.5 for half-percent discounts, or 2.75 for small rate changes.