Want to know exactly how much you save on a product or service? Enter the original price and discount percentage into the percent off calculator above, and it instantly returns the discount amount and the final sale price.
No formulas to memorize. Just type two values, and the calculator gives you the answer.
How to Use the Percent Off Calculator
- Enter the original price. This is the full price before any markdown or coupon.
- Enter the discount percentage. Type the percent off number from the sale tag or coupon (for example, 25).
- Read your results. The calculator shows the dollar amount saved and the discounted price you would actually pay.
That's it. The calculator works with any currency and any percent off level.
You can also use it to compare two or more deals side by side. Run each scenario, note the final price, and pick the better value.
Percent Off Formula: How to Calculate Percent Off Any Original Price
The math behind every percent off discount has two short steps. Understanding them helps you double-check receipts, estimate savings in your head, or calculate a discount when you do not have the calculator handy.
Calculate the Percentage Discount
Multiply the original price by the discount percentage expressed as a decimal.
Discount Amount = Original Price × (Percent Off ÷ 100)
For example, 25% off a $120 item:
120 × 0.25 = $30 discount amount
If you already know the original price and the sale price but not the percentage, reverse the process:
Discount Percentage = ((Original Price − Sale Price) ÷ Original Price) × 100
For example, if the original price is $1,000 and the sale price is $700:
(1000 − 700) ÷ 1000 × 100 = 30% off
The dollar amount saved is $300, and the discount percentage is 30%.
Calculate the Discounted Price and Sale Price
Once you have the discount amount, subtract it from the original price.
Sale Price = Original Price − Discount Amount
Using the same example: $120 − $30 = $90 sale price.
Subtract the Discount Amount From the Original Price
There is a one-step shortcut that combines both operations:
Sale Price = Original Price × (1 − Percent Off ÷ 100)
For 25% off a $120 item: 120 × 0.75 = $90.
The expression (1 − 0.25) equals 0.75. This means the sale price is 75% of the original. The shortcut is handy for mental math because you only multiply once.
Using This Calculator as a Discount Calculator and Sale Calculator
This percent off calculator doubles as a general discount calculator and sale calculator. It handles every scenario where you need to reduce a price by a given percentage.
- Store sales and markdowns. Enter the sticker price and the advertised percent off.
- Coupons. Enter the pre-coupon price and the coupon's percentage.
- Seasonal promotions. Compare Black Friday, clearance, or end-of-season deals quickly.
- Buy-one-get-one deals. If the promotion is "buy one, get one 50% off," run the calculator on the second item at 50% off, then add the full-price item to get the total.
There is no difference between "percent off" and "discount" in the math. Both mean reducing the original price by a given percentage. The calculator handles them identically.
How do I find the original price from a sale price? Divide the sale price by (1 − discount rate as a decimal). If you paid $90 after a 25% discount: 90 ÷ 0.75 = $120 original price. This lets you reverse-calculate the original price whenever a discount has been applied but the tag is missing.
Worked Examples: Calculate a Discount at Common Percent Off Levels
Below are quick reference calculations for the most common discount levels. Each uses the percent off formula on a $100 item so the math scales easily.
10 Percent Off
- Discount amount: $100 × 0.10 = $10
- Sale price: $100 − $10 = $90
For any price, move the decimal one place left to find 10%.
20 Percent Off
- Discount amount: $100 × 0.20 = $20
- Sale price: $100 × 0.80 = $80
A 20% sale of an item that costs $100 gives a final price of $80. You save $20.
25 Percent Off
- Discount amount: $100 × 0.25 = $25
- Sale price: $100 × 0.75 = $75
Quarter-off sales are common. Multiply by 0.75 for a fast answer.
30 and 50 Percent Off
30% off $100:
- Discount amount: $100 × 0.30 = $30
- Sale price: $100 × 0.70 = $70
50% off $100:
- Discount amount: $100 × 0.50 = $50
- Sale price: $100 × 0.50 = $50
Half-off is the simplest mental math. Just divide the price by two.
Stacked Discounts: How to Use the Percent Off Formula With Coupons
Stacked discounts happen when two or more markdowns apply to the same item, one after another. A store might run a 20% sale and also accept a 10% coupon.
Do stacked discounts add together? No. Each discount applies to the already-reduced price, not the original. That is the most important point to remember.
Example: 20% off, then an extra 10% coupon on a $100 item.
- First discount: $100 × 0.80 = $80
- Second discount applies to $80: $80 × 0.90 = $72
If the two percentages simply added up, you would expect 30% off ($70). Instead the final sale price is $72, because the second discount applies to the already-reduced price. The combined effect is 28%, not 30%.
General formula for two stacked discounts:
Final Price = Original Price × (1 − first discount) × (1 − second discount)
Order does not matter mathematically. 20% then 10% gives the same result as 10% then 20%.
Common Percent Off Mistakes
These errors come up often. Knowing them saves money and frustration.
- Adding stacked percentages. As shown above, a 20% discount plus an extra 10% discount does not equal 30% off. Always apply each step sequentially.
- Applying the discount to the wrong base. The percent off reduces the original price (or the current price in a stacked scenario). Applying it to the discount amount instead would mean subtracting far less than intended.
- Confusing percent off with percentage decrease. They are the same math, but in budgeting contexts a "percentage decrease" might compare two different time periods. Make sure you are comparing the right two values.
- Rounding too early. If you round the discount amount before subtracting, the final price can be off by a few cents. Calculate first, then round the final sale price.
- Forgetting tax. The percent off calculator shows the pre-tax discounted price. Sales tax applies after the discount in most US jurisdictions.
Related Calculators
Looking for a different kind of calculation? These free online calculators on ezcalcs may help:
- Percentage Calculator for general percentage math (finding what percent one number is of another, percentage increase or decrease).
- Tip Calculator for quickly splitting a restaurant bill with the right gratuity.
- Sales Tax Calculator for estimating the tax on your discounted purchase.