Percentage Calculator
Enter two numbers and get every common percentage answer at once.
Results
- A% of B
- A is what % of B?
- % change from A to B
- B increased by A%
- B decreased by A%
Percentages show up everywhere — discounts, price increases, sales targets, test scores and growth rates. This calculator answers the five most common percentage questions from just two numbers.
Find out “What is 18% of 1,500?”, “45 is what percent of 300?” or “If a price went from 200 to 260, what was the percentage increase?” without remembering any formula.
How to calculate Percentage
- Enter the percentage or the first number in field A.
- Enter the base number or the second number in field B.
- Read the line you need in the results — values update as you type.
Percentage formula
A% of B = B × A ÷ 100A as % of B = A ÷ B × 100Percentage change = (B − A) ÷ |A| × 100
Percentage example
With A = 20 and B = 250: 20% of 250 is 50; 20 is 8% of 250; going from 20 to 250 is a 1,150% increase.
Percentage: common questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 800 = 800 × 15 ÷ 100 = 120.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100. From 200 to 260: (260 − 200) ÷ 200 × 100 = 30%.
Does a 20% increase followed by a 20% decrease cancel out?
No. 100 + 20% = 120, but 120 − 20% = 96, because the second percentage is applied to a larger base.