About Percentage Calculator
Percentages are everywhere—from sales discounts and tax rates to grade scores and growth statistics. Yet, calculating them manually can be error-prone. Our Percentage Calculator acts as a multi-purpose tool to solve the three most common percentage problems: finding a percentage of a number, finding what percent one number is of another, and calculating the percentage change (growth or decline) between two values.
Master Percentage Calculator
Read our comprehensive 1000+ word guide on how to use Percentage Calculator effectively.
1How to Use
Step 1
Select the calculation mode from the tabs (e.g., 'What is X% of Y?').
Step 2
Enter the known values in the input fields.
Step 3
The result updates instantly as you type.
Step 4
Switch tabs to perform a different type of percentage calculation without reloading.
Why Use This Tool?
Application 1
Finance: Calculate tips, tax amounts, or investment growth rates.
Application 2
Education: Determine grade percentages or test scores.
Application 3
Shopping: Figure out the exact savings from a '25% off' sale.
Application 4
Business: Analyze year-over-year revenue increase or decrease.
Frequently Asked Questions
How do I calculate a percentage increase?
Subtract the original value from the new value, divide the result by the original value, and multiply by 100. Formula: ((New - Old) / Old) * 100.
How do I find X is what % of Y?
Divide X by Y and multiply by 100. Example: 20 is what % of 50? (20 / 50) * 100 = 40%.
Can I use this for negative numbers?
Yes, the tool supports negative numbers, which is essential for calculating percentage decreases or losses.