BusinessFreeBy Daniel BeglaryanUpdated August 2026

Percentage Calculator

Every everyday percentage job on one page — percent of a number, percent change, add or subtract a percent, and more.

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Percent of a number

What is%of?

Enter the values above to see the result.

What percent is it

is what percent of?

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Percent increase or decrease

Fromto?

Enter the values above to see the result.

Add or subtract a percent

Enter the values above to see the result.

Percent difference

Betweenand?

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Reverse percentage

is%of what number?

Enter the values above to see the result.

Every row is independent and updates the moment you type. Results are rounded to four decimal places for display. Percent change is measured against the starting value; percent difference is measured against the average of the two values.

Deep dive

About Percentage Calculator.

Every Percentage Calculation on One Page

Most percentage calculators make you pick the right formula first, then plug numbers into a single box. This one lays out every common percent job as its own labeled row — what is X% of Y, what percent one number is of another, percent increase or decrease, adding or subtracting a percent, percent difference, and the reverse ("30 is 25% of what?"). Fill in the blanks and the answer appears instantly, with a plain-English sentence you can copy.

It runs entirely in your browser with native math — no signup, no ads reloading between clicks, nothing sent to a server. Because each row is independent, you can keep one answer on screen while you work through another.

One honest note: results are rounded to four decimal places for display, so a repeating value like "1 is 33.3333% of 3" is shown to that precision rather than to infinity.

Common Uses

Tips and discounts: Add 18% to a bill or take 25% off a price and see the new total right away.
Sales and growth: Work out the percent increase from last month's number to this month's, or how far a metric fell.
Grades and scores: Turn "45 out of 180" into a percentage without hunting for the formula.
Tax and markup: Add a sales-tax or markup percent to a base figure, or back out the original number from a total.
Comparing two numbers: Use percent difference to compare two measurements when neither one is the "correct" baseline.
Reverse math: Know a deposit is 25% of the price? Find the full price in a single step.

Privacy: Every calculation runs entirely in your browser. Nothing you type is sent anywhere, logged, or stored.

FAQ

Frequently asked questions.

How do I find a percentage of a number?

Use the "What is X% of Y" row. For example, 20% of 150 is 30. The formula is the percent divided by 100, times the number.

How do I calculate percent change?

Use the percent change row. Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 80 to 100 is a 25% increase.

What else can it do?

It finds what percent one number is of another, adds or removes a percent, finds percent difference, and works backward, like "30 is 25% of what?" Each answer comes with a plain sentence you can copy.