Enter your original price and discount percentage to instantly calculate the discount amount, sale price, and savings. This free discount calculator handles single discounts, stacked discounts, and reverse price lookups so you can shop and plan with confidence.
Discount Calculator
Use the calculator above to find any missing piece of a discount. You can:
- Calculate the discounted price from an original price and a percentage off.
- Find the discount percentage when you know the original and sale prices.
- Reverse-calculate the original price when you only know the final price and the discount rate.
Just pick the calculation mode, enter your numbers, and the calculator shows your result instantly. All estimates are rounded to two decimal places.
How to use this calculator step-by-step
- Choose what you want to find: discount amount, sale price, discount percentage, or original price.
- Enter the values you already know. For most calculations that means the original price and the discount percentage.
- Click Calculate.
- Read your results. The calculator displays the discount amount, final price after discount, and total savings.
No sign-up required. This is a free discount calculator you can use as many times as you need.
Calculate a discount from the original price
When you know the original price and the discount percentage, two numbers matter: how much you save and what you actually pay.
Calculate the discount amount
Multiply the original price by the discount percentage expressed as a decimal.
Formula: Discount Amount = Original Price × (Discount Percentage ÷ 100)
Example: A $200 item with a 25% discount.
$200 × 0.25 = $50 discount amount
That $50 is the amount subtracted from the original price.
Calculate the sale price
Subtract the discount amount from the original price. Or multiply the original price by (1 minus the discount rate).
Formula: Sale Price = Original Price × (1 − Discount Percentage ÷ 100)
Using the same example:
$200 × 0.75 = $150 sale price
Both paths give you the same final price after discount. The second formula is faster when you want to skip straight to what you pay.
Calculate discount percentage
Sometimes a store shows the original price and the sale price but not the percent off. Here's how to calculate the discount percentage yourself.
Formula: Discount Percentage = ((Original Price − Sale Price) ÷ Original Price) × 100
Example: An item drops from $80 to $60.
- Subtract: $80 − $60 = $20 savings.
- Divide by the original price: $20 ÷ $80 = 0.25.
- Multiply by 100: 0.25 × 100 = 25% off.
This works for any price reduction, whether it's a clearance tag, a coupon, or a negotiated deal.
Calculate the original price from a discounted price
If you only see the final sale price and the discount percentage, you can reverse-calculate the original price.
Formula: Original Price = Sale Price ÷ (1 − Discount Percentage ÷ 100)
Example: You paid $60 after a 20% discount.
$60 ÷ 0.80 = $75 original price
This is useful when a receipt shows the reduced price and the percent off but not the retail price. Enter both values into the calculator and it returns the original price instantly.
Percent off calculator for price reductions
This tool doubles as a percent off calculator for everyday price reductions. Whether the tag says "30% off," "save 10%," or "half price," the math is the same.
Quick reference for common discounts on a $100 item:
- 10% off: $100 × 0.90 = $90
- 20% off: $100 × 0.80 = $80
- 25% off: $100 × 0.75 = $75
- 30% off: $100 × 0.70 = $70
- 50% off: $100 × 0.50 = $50
For any other percentage, plug the numbers into the calculator above. It handles decimals, odd percentages, and large totals without doing the math by hand.
Type of discount and how each calculation works
Not all discounts are structured the same way. Here's how the most common types break down.
Percentage discount
The most common type. A percentage discount reduces the price by a fixed share of the original price.
Example: 20% off a $150 jacket.
$150 × 0.20 = $30 off. Final price = $120.
A percentage discount of 20% always removes one-fifth of the price, regardless of the dollar amount.
Fixed amount discount
A fixed amount discount subtracts a set dollar value. There's no percentage to calculate. You simply subtract that amount from the original price.
Example: $15 off a $90 pair of shoes.
$90 − $15 = $75 final price
To find what percentage that represents, divide the fixed amount by the original price and multiply by 100. In this case: ($15 ÷ $90) × 100 = about 16.7%.
Stacked discount calculations
Stacked discounts apply two or more discounts in sequence. The key detail: the second discount applies to the already-reduced price, not the original.
Example: 20% off, then an extra 10% off.
- $100 × 0.80 = $80 (after the first discount).
- $80 × 0.90 = $72 (after the second discount).
The effective discount is 28%, not 30%. Stacking discounts never equals simply adding the percentages together. Each discount reduces a smaller base, so the combined savings are always slightly less than the sum of the individual rates.
Does the order of stacked discounts matter? No. Multiplication is commutative. $100 × 0.80 × 0.90 gives the same result as $100 × 0.90 × 0.80. The final price is $72 either way.
Frequently asked questions about the discount calculator
How do you calculate a discount?
Multiply the original price by the discount percentage divided by 100. That gives you the discount amount. Then subtract that amount from the original price to find the sale price.
Formula: Sale Price = Original Price − (Original Price × Discount Percentage ÷ 100)
Example: 30% off a $50 item. $50 × 0.30 = $15 discount. $50 − $15 = $35 sale price.
How do you calculate discount percentage from the original price and sale price?
Subtract the sale price from the original price. Divide that difference by the original price. Multiply by 100.
Formula: Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100
If an item went from $120 to $90: ($30 ÷ $120) × 100 = 25% off.
How do you calculate the original price from a discounted price?
Divide the discounted price by (1 minus the discount percentage as a decimal).
Formula: Original Price = Discounted Price ÷ (1 − Discount % ÷ 100)
If you paid $72 after a 10% discount: $72 ÷ 0.90 = $80 original price.
Does this calculator account for tax?
No. This calculator estimates the price after discount only. Sales tax, VAT, or GST are typically calculated on the discounted price at checkout. To estimate your total out-of-pocket cost, apply your local tax rate to the sale price the calculator returns.
Can this percent off calculator handle coupon discounts?
Yes. A coupon that offers a percentage off works exactly like any other percentage discount. Enter the original price and the coupon's percent off, and the calculator returns the discount amount and final price. For fixed-dollar coupons, simply subtract the coupon value from the original price. You can also stack a percentage coupon with a sale discount using the stacked discount approach described above.