Percentage Calculator
Easily calculate percentages, percentage increases, and changes between numbers to solve everyday math problems.
What is X% of Y?
Enter your values and click calculate to see the results.
X is what % of Y?
Enter your values and click calculate to see the results.
Percentage change from X to Y
Enter your values and click calculate to see the results.
Skip the complicated math formulas. This tool provides simple, dedicated inputs to solve everyday percentage problems instantly, from finding proportional values to calculating percentage differences.
How to Use
Select the specific type of percentage calculation you need from the options.
Enter your first value into the corresponding input field.
Enter your second value or percentage rate into the second field.
Click the Calculate button to process the mathematics.
Review the precise percentage result displayed below the inputs.
Formula
To find a percentage of a number, the tool divides the percent by 100 and multiplies it by the base value. To find a percentage change, it subtracts the old value from the new value, divides by the old value, and multiplies by 100.
Examples
This is the most common use case, like figuring out a basic tip. The tool converts the percentage into a decimal (0.15) and multiplies it by the total.
Ideal for determining test scores or performance metrics. It divides the partial number (45) by the total (150) to reveal it represents exactly 30%.
A practical 10% increase calculation or higher. The tool finds the absolute difference ($10) and divides it by the original starting price to calculate the growth rate.
Used to measure reduction, such as weight loss or price drops. It calculates the difference and divides by the initial 80 kg starting point.