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Percentage Calculator

Four everyday percentage calculations in one place"Calculate the percentage" means four different things, each with a different formula. This tool separates them into four clear modes: X percent of Y, what percent one number is of another, percentage change, and increase or decrease by a percentage.

✓ Free to use✓ No sign-up✓ Ready in your browser
// PERCENTAGE CALCULATOR · GET STARTED

Use Percentage Calculator

Four everyday percentage calculations in one place

20% of 150 is 30

Formula: (20 / 100) x 150 = 30

// PERCENTAGE CALCULATOR · HOW IT WORKS

How to use the Percentage Calculator

01

Choose a mode

Pick one of the four calculation modes at the top.

02

Enter your numbers

Enter the two numbers that mode asks for.

03

Read the answer

Read the result as a plain sentence, with the formula shown underneath.

// PERCENTAGE CALCULATOR · ABOUT THIS TOOL

About the Percentage Calculator

Percentages show up everywhere: discounts, exam scores, tax, salary raises and business growth. The trouble is there are four different questions people mean by "calculate the percentage", and each uses a different formula. This calculator separates them into four clear modes so you get the right maths for the question you are asking. Every mode explains its answer in a plain sentence with your own numbers and shows the formula line underneath, which makes it handy for homework, invoices and quick sanity checks. Everything updates as you type.

Where it helps most

The right mode for the question you are actually asking.

Discount checks

Shoppers verify discount tags before buying, using the X percent of Y mode for the classic sale question, right at the shelf.

Student marks

Students convert raw marks into percentages for report cards and applications, seeing the exact steps instead of just the answer.

Salary figures

Employees compute salary raises and bonus figures, and business owners track revenue growth month over month with the change mode.

Business growth

Business owners track revenue growth month over month and compare this quarter against last, labeled as increase or decrease, automatically.

Using it well

It teaches as it answers.

Plain-sentence answers

Every answer arrives as a plain sentence with your own numbers in it, like '20% of 150 is 30', with the formula written underneath.

Live results

Results update as you type, so dragging numbers around to test scenarios feels instant and everything stays in your browser.

Four modes, no confusion

Four clear modes cover every percentage question, so you always get the math for the one you are actually asking.

Percentage Calculator: private by design

Everything runs in your browser with nothing sent anywhere, and it doubles as a homework-checking teacher.

// PERCENTAGE CALCULATOR · COMMON QUESTIONS

Percentage Calculator FAQs

Divide the percentage by 100 and multiply by the number. Twenty percent of 150 is 0.2 times 150, which equals 30. The first mode of this tool does exactly that and displays the formula with your numbers.
// PERCENTAGE CALCULATOR · KEEP EXPLORING

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