Percentage Calculator
Answer the three most common percentage questions. Choose the question, enter the two numbers, and see the result with the full sentence so you know exactly what it means.
Result
20
25% of 80 is 20
Check the highlighted fields to see your result.
Results are estimates for information only and do not constitute financial, medical, or legal advice.
The three percentage questions
A percentage is a number out of 100: 25% means 25 out of every 100. Most everyday questions are one of the three below, and the calculator answers all of them.
The formulas
X% of Y = X ÷ 100 × Y
X is what % of Y = X ÷ Y × 100
X is Y% of = X ÷ (Y ÷ 100)
Worked example
- What is 15% of 240? 15 ÷ 100 × 240 = 36.
- What percent is 36 of 240? 36 ÷ 240 × 100 = 15%.
- 36 is 15% of what number? 36 ÷ (15 ÷ 100) = 36 ÷ 0.15 = 240.
Frequently asked questions
What's a quick way to work out a percentage in my head?
Start from 10%: move the decimal point one place to the left. 10% of 240 is 24, so 5% is 12 and 15% is 24 + 12 = 36.
Can a percentage be more than 100%?
Yes. 150% of 40 is 60, one and a half times the number. A value can also be more than 100% of a total, for example 120 is 150% of 80.
What's the difference between a percent and a percentage point?
If a rate goes from 4% to 5%, it rose 1 percentage point, but that is a 25% increase relative to 4%. Use our percentage change calculator for increases and decreases.