Percentage Calculator

About Percentage Calculator

Percentages appear in discounts, tips, grades and growth. Enter two values and the calculator instantly shows what A percent of B is, what percent A is of B, the percentage change from A to B and B increased or decreased by A percent. Students, shoppers and professionals can use it to avoid mistakes in common calculations.

Example

Input: A = 20, B = 150. Output: 20% of 150 is 30, 20 is 13.33% of 150, the change from 20 to 150 is 650%, 150 plus 20% is 180.

Tips for better results

• Read the labels carefully, since each line answers a different question.
• To find a discount, use 150 minus 20%.
• Percentage change uses the first number as the starting point.

When to use Percentage Calculator

The Percentage Calculator is handy whenever a number needs to be compared, discounted or grown by a rate. Shoppers checking sale prices, students working on grades, small business owners tracking growth and anyone splitting costs can use it. Enter two numbers and read the answer to the question that matches your situation. Because each line answers a different type of question, it saves you from choosing the wrong formula, which is the most common source of percentage errors.

Real-world uses

• A shopper wants to know the final price of a jacket marked twenty-five percent off and how much money the discount saves.
• A student checks what percent a test score of 42 out of 50 represents before comparing it with a grade cutoff.
• A shop owner compares last month's and this month's order counts to see the percentage change in orders.
• A manager calculates a ten percent increase to a monthly supplier cost to see the new amount for the budget.

Common mistakes to avoid

• Mixing up which number is the base gives a very different answer. Decide which value is the whole before entering numbers, and read the label on each result.
• Adding a percentage increase and then subtracting the same percentage does not return you to the start. The base changes after the first step.
• Comparing percentage points with percent change causes confusion. Going from 10 percent to 12 percent is two points, but a twenty percent increase.

Percent of, percent change and what-percent in one place. It works instantly in your browser, so there is nothing to install and nothing to upload. Percentage Calculator is part of our collection of 100 free tools in the Daily Life & Money category.

How to use it

1. Enter your information or choose a file in the tool above.
2. Your result appears right below the tool.
3. Copy the result, or adjust your input and try again.

Want a deeper guide? Read How to Calculate Percentage Increase and Decrease.

Frequently asked questions

How do I calculate a tip?

Use the percent of option. Enter the tip rate, such as 18, and the bill amount to get the tip. Add it to the bill for the total. The Tip and Bill Split Calculator can also split it.

Is percent change the same as percent difference?

Not exactly. Percent change treats one value as the starting point, so the order matters. Other comparisons may use an average as the base. This tool uses the first number as the start.

Is Percentage Calculator free to use?

Yes. Percentage Calculator is completely free and you do not need to create an account.

Is my data uploaded anywhere?

No. This tool runs in your browser, so what you type or choose stays on your device.

How accurate are the results?

Calculations use standard formulas, but always double-check important figures, especially for money, health or legal decisions.