Percentage Calculator
A versatile percentage calculator that can compute percentages, percentage changes, and more.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Percentage Calculator
This calculator handles three common percentage tasks. Enter numbers in any field (decimals allowed) and click the corresponding Calculate button.
1. What is X% of Y?
- Enter the percentage (X) and the total (Y).
- Example: For "20% of 200", enter X=20, Y=200.
- Result: Shows the calculated value (e.g., 40.00).
2. X is what percent of Y?
- Enter the part (X) and the whole (Y).
- Example: For "30 is what percent of 150?", enter X=30, Y=150.
- Result: Shows the percentage (e.g., 20.00%).
3. Percentage change from A to B
- Enter the original value (A) and the new value (B).
- Example: For change from 40 to 60, enter A=40, B=60.
- Result: Shows the percentage change with sign (e.g., +50.00% or -25.00%).
- Note: A cannot be zero.
Important: All inputs must be positive numbers. If you see an error message, check your entries and try again.
Previous Results
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Frequently Asked Questions
Multiply the number by the percentage (as a decimal). For example, 20% of 200 = 0.2 * 200 = 40.
Divide the first number by the second and multiply by 100. For example, 30 out of 150 = (30/150)*100 = 20%.
Subtract the old value from the new, divide by the old value, and multiply by 100. For example, from 40 to 60: ((60-40)/40)*100 = 50% increase.
