📊 Percentage Calculator
Calculate percentages, percentage changes, and find what percent one number is of another.
📊 Percentage Calculator
Find what X% of Y equals.
Result
Percentage Calculator – Complete Guide
The Percentage Calculator from CalcTools is a versatile tool that handles three common percentage calculations: finding a percentage of a number, determining what percentage one value is of another, and calculating percentage change between two values.
Types of Percentage Calculations
1. Percentage of a Number
Formula: (Percentage / 100) × Total
Example: 20% of 500 = (20/100) × 500 = 100
2. What Percentage is X of Y?
Example: 45 is what % of 200? = (45/200) × 100 = 22.5%
3. Percentage Change
Example: From 100 to 125 = ((125-100)/100) × 100 = 25% increase
Common Use Cases
- Calculating exam scores and grades
- Determining discounts while shopping
- Computing tax amounts (GST, income tax)
- Tracking business growth or decline
- Figuring out tips at restaurants
- Analyzing data and statistics
Frequently Asked Questions
Select "% of a Number" mode. Enter 30 in the Percentage field and 250 in the Of Number field. Click Calculate. The result is 75 (because 30/100 × 250 = 75).
Select "% Change" mode. Enter 80 as the original value and 100 as the new value. The percentage increase is ((100-80)/80) × 100 = 25%.
Select "What % is X of Y?" mode. Enter 15 as X and 60 as Y. The result is (15/60) × 100 = 25%.
Yes! Percentages can exceed 100%. For example, if a value doubles, that's a 100% increase. If it triples, it's a 200% increase. This calculator handles all such cases correctly.