Percent Calculator
What is B% of A? What percent of B is A? Calculate percentages and rate of change easily.
What is B% of A?
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A is what % of B?
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Value increased by B%
from% increase
Value decreased by B%
from% decrease
Rate of change
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How to Use
- 1Choose a calculation mode — Select the type of percentage calculation you need: percentage of a number, what percent A is of B, or percentage change.
- 2Enter your values — Type the numbers into the input fields according to the selected calculation mode.
- 3View the result — The percentage result is calculated and displayed instantly as you type, with the formula shown for reference.
Tips
- ✓Results are calculated in real-time as you enter numbers.
- ✓Use for discount rates, tax rates, tip calculations, and more.
- ✓Calculate rate of change for sales growth, grade changes, and more.
Frequently Asked Questions
How do I calculate what percentage one number is of another?
Enter the part value and the whole value. The calculator divides the part by the whole and multiplies by 100 to give you the percentage. For example, 25 is 50% of 50.
How do I calculate a percentage of a number?
Enter the percentage and the number. The calculator multiplies the number by the percentage divided by 100. For example, 20% of 150 is 30.
How do I calculate percentage increase or decrease?
Enter the original value and the new value. The calculator computes the percentage change using the formula: ((new - original) / original) x 100.
What is the formula for percentage calculation?
The basic percentage formula is: Percentage = (Part / Whole) x 100. The calculator supports this and several other percentage calculation modes.