Percentage Calculator
Calculate percentages, what percent one number is of another, or percentage change, instantly in your browser.
How to use the Percentage Calculator
- Choose the calculation: X% of Y, X is what percent of Y, or percentage change from X to Y.
- Enter the value for X.
- Enter the value for Y.
- Click Run to see the answer along with the formula used.
How the Percentage Calculator works
Each mode uses one of three basic percentage formulas:
X% of Y = X ÷ 100 × Y (15% of 80 is 12)X as a percent of Y = X ÷ Y × 100 (12 of 80 is 15%)Percentage change = (Y − X) ÷ X × 100 (80 to 100 is a 25% increase)
A positive change is an increase and a negative one is a decrease. Remember that percentage changes aren't symmetrical: going from 100 to 80 is a 20% decrease, but going back from 80 to 100 is a 25% increase.
Frequently asked questions
- Is this percentage calculator free?
- Yes. Calculate percentages at no cost, with no account required.
- What calculation types are supported?
- Finding X% of Y, determining what percent X is of Y, and calculating the percentage change from X to Y.
- How is percentage change calculated?
- Percentage change = (Y - X) / X x 100. A positive result is an increase; a negative result is a decrease.