Introduction
This percentage of calculator helps you solve the three most common percentage problems in seconds. Enter your numbers and get an instant answer with step-by-step math shown below it.
Use Mode 1 to find a result — like what is 25% of 200. Use Mode 2 to find the percent — like 50 is what percent of 200. Use Mode 3 to find the base — like 50 is 25% of what number. Each mode includes a clear breakdown of the formula used and a visual chart so you can see how the numbers relate to each other.
Whether you need help with homework, want to calculate a tip, or need to figure out a discount, this tool does the work for you. Just type in your values, hit Calculate, and read the answer.
How to Use Our Percentage Of Calculator
Enter your numbers into any of the three calculator modes below. The tool will instantly show you the answer, a step-by-step solution, and a visual chart.
Mode 1 – Find the Result: Type the percent in the first box and the base number in the second box. The calculator will tell you what that percentage of your number equals.
Mode 2 – Find the Percentage: Type the part in the first box and the whole number in the second box. The calculator will tell you what percent the part is of the whole.
Mode 3 – Find the Base: Type the part in the first box and the percent in the second box. The calculator will tell you the full base number that your part came from.
Press Calculate to see your result, or just type and the answer will update on its own. Press Copy to save the answer to your clipboard.
What Is a Percentage?
A percentage is a way to show a number as a part of 100. The word "percent" means "per hundred." When you see 25%, it means 25 out of every 100. You use percentages every day — in store discounts, test scores, tips, tax rates, and much more.
How to Calculate Percentage Of a Number
To find a percentage of a number, divide the percent by 100, then multiply by the number. For example, to find 20% of 150, you do: (20 ÷ 100) × 150 = 30. This is the most common percentage calculation people need. If you're looking for how much a value has gone up or down in percentage terms, try our percent change calculator instead.
Three Types of Percentage Problems
Every percentage problem has three parts: the percent, the base (the whole amount), and the part (the result). If you know any two of these, you can find the third.
- What is X% of Y? — You know the percent and the base. Multiply to find the part. Example: What is 10% of 80? Answer: 8.
- X is what % of Y? — You know the part and the base. Divide the part by the base, then multiply by 100. Example: 20 is what percent of 80? Answer: 25%.
- X is Y% of what? — You know the part and the percent. Divide the part by the percent, then multiply by 100 to find the base. Example: 20 is 25% of what? Answer: 80.
For related calculations, you can also use our percentage increase calculator to find how much a value has grown, our percentage decrease calculator for reductions, or our percent difference calculator to compare two values side by side.
The Percentage Formula
All three problems come from one simple formula:
Part = (Percent ÷ 100) × Base
You can rearrange this formula to solve for whichever value is missing. The calculator above does this for you instantly and shows each step so you can learn how it works. For a broader set of percentage tools — including quick conversions and additional modes — visit our full percentage calculator. And if you need to measure accuracy against an expected value, our percent error calculator is a great companion tool.