CB
Percentage Calculator
Solve the most common percentage questions: what is X% of Y, what percent A is of B, and percentage increase or decrease.
What this tool helps with
Useful for discounts, markups, exam scores, savings, tips, commissions, and quick everyday number checks.
Enter your values, review the result and use the related guide if you want the formula explained step by step. The page is designed to answer both quick utility intent and follow-up informational intent.
1) What is X% of Y?
Answer
30
2) A is what percent of B?
Answer
75%
3) Percentage increase or decrease
Change
25%
This is a percentage increase.
Quick examples
Question
Input
Result
What is 20% of 150?
20 and 150
30
45 is what percent of 60?
45 and 60
75%
80 to 100
original 80, new 100
25% increase
FAQ
How do you calculate a percentage of a number?
Multiply the number by the percentage and divide by 100.
How do you calculate percentage change?
Subtract the original value from the new value, divide by the original, then multiply by 100.