Percent Off Calculator

Q: How to calculate percent off?

To calculate the new number: Divide the number by 100 (move the decimal place two places to the left). Multiply this new number by the percentage you want to take off. Subtract the number from step 2 from the original number. This is your percent off number.

Q: How much is 10 percent off?

Taking 10 percent off a number changes depending on the original number : Divide your number by 10. Subtract this new number from your original number. That's it. You've taken 10 percent off !

Q: How much is 15 percent off?

Finding 15 percent off is affected by the original number: Divide your original number by 20 (halve it, then divide by 10). Multiply this new number by 3. Subtract the number in step 2 from your original number. You’ve just found your percentage off!

Q: How much is 30 percent off?

To take 30 percent off a number: Divide the number by 10. Triple this new number. Subtract your triple from your starting number. That’s 30 percent off! For $30, you should have $21 remaining.

Q: How much percent is off on Black Friday?

The percent you save on Black Friday and Cyber Monday changes depending on the item and store you are looking at. The average percent off on Black Friday is 35% , but be sure to shop around to make sure you’re getting the best deal!

Creators

Tibor Pál, PhD candidate

Tibor PálPhD candidate

Tibor is a Ph.D. candidate in Statistics at the University of Salerno, focusing on time series models applied in macroeconomics and finance. His work is greatly motivated by the perception that risk, uncertainty, and unexpected events are inherent driving features of everyone's lives; thus, attitude towards these aspects is essential to one's life and economics. Hence, his primary interest is developing novel statistical approaches to capture unordinary episodes in economic activity and irregularities in the financial market driven by risk-related behaviors. Translating these elements into his life makes him keen to discover and live in unusual places where he can always bring some unique features into his daily life. He likes gastronomy, nature, and mountains, so traveling, cooking, and hiking are his favorite activities in his free time. See full profile

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, Piotr Małek

Piotr Małek

A graduate of Cracow’s University of Economics, Piotr is a data analyst and technical content creator with a passion for tackling complex problems and making data accessible to all. With over 8 years in technical content creation, he has produced a wide range of materials—from blog posts and landing pages to case studies and documentation—while also starring in and producing educational videos. Known for his ability to break down intricate topics into clear, straightforward explanations, Piotr is dedicated to educating others and building communities around SaaS products. An avid cyclist, marathon runner, and triathlete, Piotr approaches both professional and personal challenges with the same dedication. When he’s not analyzing data or creating content, he’s often exploring new destinations or attempting to master complex board games (which he then tries, often unsuccessfully, to convince his wife to play). See full profile

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, and Bogna Szyk

Bogna Szyk

Bogna is the chief operating officer at Omni Calculator, where she helps keep things running smoothly and ideas moving forward. With a background in civil engineering and a knack for organizing chaos, she brings structure and strategy to everything she does. After hours, you’ll likely find her dancing zouk or crafting the next twist in a D&D campaign. See full profile

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Reviewers

Jack Bowater

Our percent off calculator helps you determine how much you will save during a sale, figure out percentages, calculate how much percent off is Black Friday, and much more! Keep reading - if you don't know how to figure out percentages, this calculator will save you a lot of trouble.

What percent off calculator is great for

Omni's Percent Off Calculator isn't just for occasional use, it’s built to handle a variety of shopping scenarios, helping you save time and make smarter decisions. Whether you’re buying clothes, electronics, groceries, or even more expensive items, the percentage off calculator is here to help. Instead of relying on mental math or generic tools, our calculator gives precise, instant results that make budgeting easier and shopping more transparent. With just a few inputs, you’ll know exactly how much you’re saving and the final price.

Here’s how our sale calculator (percent off calculator to be exact) helps you make better decisions:

It helps you to quickly compare different discounts before buying;
Instantly see the final price after applying, for example, a 15 percent off;
Avoid overpaying due to misleading “before” prices (and see how much percent off really is for black friday); and
Learn how to figure out percentages.

"Percent off" and discount

Actually, "percent off" and "a discount" are the exact same thing. Imagine it's Black Friday and all of the goods in a certain store are 75% off. Our sale calculator will figure out how much money stays in your pocket!

You can take a look at our discount calculator for more information on this topic 💰

How to figure out percentages

Our percent off calculator is a special case of a percentage change; more specifically, it uses the percentage decrease formula. The process of calculating your discount is as follows:

Enter the original price into our percent off calculator. For example, a TV set might originally set you back $5000.
Determine the percentage discount - everything is 75% off in our example store.
The sum that stays in your pocket - your savings - is simply these two values multiplied by each other: 75% × $5000 = 0.75 × $5000 = $3750.
The final price of the product on sale is the difference between the original price and savings: $5000 - $3750 = $1250.
You can also use the percent off calculator to determine how much more you have to pay if the price of the product goes up! Simply type a negative value into the "off" box - our calculator will use the percentage increase formula.

If you're interested in the salesperson's fee, be sure to check out our commission calculator.

🙋 We use percentages in almost all aspects of our life, not just finance. For example, we can also use percent to express the relative error between the observed and true values in any measurement. To learn how to do that, check our percent error calculator.

Psychological and strategic aspects of discounts

Discounts don’t just lower prices — they shape consumer perception. A percent-off deal leverages the anchoring effect, where the original price makes the discounted one seem more appealing, increasing the perceived value of the purchase.

For retailers, these deals are powerful psychological tools that can drive urgency, encourage impulse buying, and boost customer loyalty when used wisely. However, there’s a strategic balance to maintain. Frequent discounts can erode a brand’s perceived quality or train customers to wait for sales, potentially hurting long-term revenue. That’s why understanding how to figure out percentages is essential.

FAQs

How to calculate percent off?

To calculate the new number:

Divide the number by 100 (move the decimal place two places to the left).
Multiply this new number by the percentage you want to take off.
Subtract the number from step 2 from the original number. This is your percent off number.

How much is 20 percent off?

20 percent off depends on the original cost:

Take the original number and divide it by 10.
Double your new number.
Subtract your doubled number from the original number.
You have taken 20 percent off!

For $30, you should have $24 remaining.

How much is 10 percent off?

Taking 10 percent off a number changes depending on the original number:

Divide your number by 10.
Subtract this new number from your original number.
That's it. You've taken 10 percent off!

How much is 15 percent off?

Finding 15 percent off is affected by the original number:

Divide your original number by 20 (halve it, then divide by 10).
Multiply this new number by 3.
Subtract the number in step 2 from your original number.
You’ve just found your percentage off!

How much is 30 percent off?

To take 30 percent off a number:

Divide the number by 10.
Triple this new number.
Subtract your triple from your starting number.
That’s 30 percent off! For $30, you should have $21 remaining.

How much percent is off on Black Friday?

The percent you save on Black Friday and Cyber Monday changes depending on the item and store you are looking at. The average percent off on Black Friday is 35%, but be sure to shop around to make sure you’re getting the best deal!