Percentage Calculator
Percentages are everywhere — discounts, tips, taxes, grades. Our calculator handles three common percentage scenarios in one click.
What Is
A percentage represents a fraction of 100. This calculator handles three modes: A is what % of B, what is A% of B, and the percentage change from A to B.
How to Use
- Choose the calculation mode from the dropdown
- Enter the two numbers
- Click Calculate for the result
- Mode 1: A is what % of B
- Mode 2: What is A% of B
- Mode 3: % change from A to B
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Frequently Asked Questions
How to calculate percentage?
Divide the part by the whole and multiply by 100. Example: 30/150 x 100 = 20%.
What is percentage change?
It measures the relative change between two values: (new - old) / old x 100.
What is a percentage point?
A percentage point is the arithmetic difference between two percentages. Going from 10% to 15% is a 5 percentage point increase.
How to add a percentage?
Multiply the value by (1 + percentage/100). For example, add 10% to 100: 100 x 1.1 = 110.
What is a good tip percentage?
15-20% is standard in most countries. 15% for good service, 20% for great service.