Percentage Calculator
Find a portion of a whole.
Result
Computed calculation result.
Computation Guide
Calculates the portion of a number. Useful for finding discounts, taxes, or partial quantities.
Determines what fraction one number is of another, expressed as a percentage.
Finds the relative change between an old and new value. Negative values indicate a decrease.
Percentage Guide Guide
How to Use
- 1Select the type of percentage problem you want to solve.
- 2Enter the known values (e.g., the total amount and the percentage).
- 3Click calculate to get the answer.
Formula & Logic
A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%".
Practical Applications
Finance & Shopping
Calculate discounts during sales, tip amounts at restaurants, or sales tax.
Statistics
Determine the percentage increase or decrease in data over time (e.g., quarterly revenue growth).
Education
Calculate test scores or grades as a percentage of total possible points.
Frequently Asked Questions
Q.How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100.
Q.What is X% of Y?
To find X% of Y, convert the percentage to a decimal (X/100) and multiply it by Y. Example: 20% of 50 is 0.20 * 50 = 10.
Q.How do I reverse calculate a percentage?
If you know the final price after a tax was added, divide the final price by (1 + tax rate) to find the original price.