How to use the Discount Calculator
- Enter the original price.
- Enter the discount percentage, plus any extra coupon.
- Add sales tax if you want the checkout total.
- Optional: compare delivered totals for this offer and another deal.
How to calculate a discount
Sale price = original price × (1 − discount ÷ 100). For 25% off $80: $80 × 0.75 = $60, saving $20.
Stacked discounts are not added together
“30% off plus an extra 20%” is not 50% off. The second discount applies to the already-reduced price: $100 → $70 → $56, which is a 44% total discount. The calculator shows the effective discount for you.
Frequently asked questions
How do I find the original price from a sale price?
Divide the sale price by (1 − discount). A $60 item at 25% off was originally $60 ÷ 0.75 = $80.
Is tax charged on the original or discounted price?
In most places sales tax is charged on the discounted price, which is how this calculator works.