Discount Calculator
Calculate discounted sale prices, total dollars saved, and final costs with sales tax for shopping and retail promotions.
About the Discount Calculator
The Discount Calculator helps shoppers and retail merchants quickly calculate price reductions during sales events (such as Black Friday, Cyber Monday, seasonal clearances, and promotional coupons).
Enter the original price and the advertised percentage off to immediately see how much cash you save, the discounted price, and the final checkout cost after local sales tax is applied.
How to Calculate Discount
Enter the Original Sticker Price.
Enter the Discount Percentage (e.g., 20% or 35% off).
Optionally enter your local Sales Tax percentage.
Click Calculate to see your exact dollar savings and the final price.
Discount & Final Sale Price Formulas
Savings Amount = Original Price × (Discount % / 100) Discounted Price = Original Price - Savings Amount Final Price with Tax = Discounted Price + (Discounted Price × Tax % / 100)
Multiply the sticker price by the discount percentage to find savings, then subtract that amount from the original price.
Variable Descriptions
- Original Price
- Pre-sale manufacturer or retail sticker price
- Discount %
- Advertised price reduction percentage
- Sales Tax %
- Optional state or local sales tax rate
Worked Example
Important Considerations & Tips
- A 50% discount means you pay half the original price.
- Stacking discounts (e.g., 20% off plus an extra 10% off) is not 30% off—the second discount applies to the already discounted subtotal.
- Sales tax is assessed on the final discounted price, not the original sticker price.
Frequently Asked Questions
How do you calculate a 20% discount on an item?
Multiply the price by 0.20 to find what you save, or multiply the price by 0.80 to directly find the final sale price.
How does a "buy one, get one 50% off" deal work in percentage terms?
If two equally priced items are purchased, a BOGO 50% discount equates to an overall 25% discount across both items.
How do I calculate the original price from a sale price?
Divide the sale price by (1 - Discount % / 100). For example, if an item costs $80 after a 20% discount: $80 / 0.80 = $100 original price.
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