How to calculate percent off

Calculating a percentage discount is straightforward once you know the formula. Whether you are shopping during a sale, calculating a trade discount, or checking how much you save on a deal — the math is always the same.

Savings = Original Price × (Discount % ÷ 100)
Final Price = Original Price − Savings

Step-by-step example: 20% off $100

  1. Write down the original price: $100
  2. Convert the discount to a decimal: 20% ÷ 100 = 0.20
  3. Calculate savings: $100 × 0.20 = $20 savings
  4. Subtract from original: $100 − $20 = $80 final price
💡 Quick mental math trick: To find 20% off any price, divide the price by 5. That is your discount. Subtract from original for the sale price.

Discount reference table

Use this quick reference table to see how much you save at common discount levels across popular price points.

Discount

Sale tips and how to compare deals

Big sale events use discounts to create urgency. Understanding how to calculate percent off helps you make smarter decisions and avoid misleading deals.

The anchoring effect

Retailers set a high "original" price so the discounted price feels like a great deal. Always compare the sale price with prices on other platforms before buying.

Stacked discounts

Some stores offer stacked discounts — for example "30% off, then an extra 20% off." This is not the same as 50% off.

After 30% off $100 = $70 → then 20% off $70 = $56
Total saving = $44 (44%) — NOT 50%

Mental math shortcuts

  • 10% off — Divide by 10. $80 → $8 off → $72
  • 20% off — Divide by 5. $80 → $16 off → $64
  • 25% off — Divide by 4. $80 → $20 off → $60
  • 50% off — Divide by 2. $80 → $40 off → $40
  • 75% off — Divide by 4, multiply by 3. $80 → $60 off → $20

Frequently asked questions

How do I calculate percent off?+
Multiply the original price by the discount percentage divided by 100 — that gives you the savings. Subtract savings from the original price to get the sale price. Example: 20% off $500 = $100 savings → $400 final price.
How much is 20 percent off?+
20% off means you pay 80% of the original price. Divide the price by 5 to find the discount. Example: 20% off $1,000 = $200 off = $800 final price.
How much is 10 percent off?+
Divide the original price by 10. That is your discount. Example: 10% off $750 = $75 off = $675 final price.
How much is 30 percent off?+
Multiply the price by 0.70 to get the final price directly. Example: 30% off $200 = $200 × 0.70 = $140. Savings = $60.
What is the difference between percent off and discount?+
"Percent off" and "discount" mean the same thing — a reduction in price expressed as a percentage of the original price. A 25% discount and 25% off are identical calculations.
How do I calculate two discounts applied together?+
Apply the first discount to the original price, then apply the second to the result. They do not add up. Example: 30% then 20% off $100 = $70 → $56. Total saving is 44%, not 50%.