Double Discount Calculator - Stacked Sale Savings
Calculate the final sale price, total savings, and effective discount when two percentage discounts apply in sequence.
Enter the original price and each discount percentage to see why stacked discounts do not simply add together.
Double Discount Calculator - Stacked Sale Savings
Calculate the final sale price, total savings, and effective discount when two percentage discounts apply in sequence.
About the Double Discount Calculator
A double discount is a sequence of two price reductions, such as a store-wide sale followed by a member coupon or a supplier discount followed by a seasonal promotion. This Double Discount Calculator shows the final price, the dollar savings, and the single effective discount that describes both reductions together. It is useful for retail shoppers, procurement teams, sales staff, and anyone checking an advertised offer. The important detail is that the second percentage applies to the already discounted price, not to the original list price.
The calculation first multiplies the original price by one minus the first discount as a decimal. It then applies one minus the second discount to that reduced amount. A $100 item with a 20% discount becomes $80. Applying another 10% discount reduces $80 to $72, for total savings of $28. The effective discount is therefore 28%, not 30%. In formula form, final price equals original price times (1 minus first discount) times (1 minus second discount). This compounding effect becomes more important when discounts are large or when several promotions stack.
Use the calculator with the actual eligible price. Some offers exclude tax, shipping, gift cards, clearance merchandise, or brands subject to manufacturer rules. A coupon might have a dollar cap, a minimum order, or a requirement to buy several units. Sales tax can be assessed after discounts in many locations, but the exact treatment varies. If rewards points, cash back, delivery charges, or a membership fee are involved, compare the total checkout cost instead of only the advertised percentage. Business buyers should also check whether discounts apply before freight, insurance, and volume rebates.
For negotiations, the effective discount makes competing proposals easier to compare. Two vendors may describe their terms differently: one might quote 25% off, while another offers 15% followed by 12%. Convert both offers to a final price on the same original amount before deciding. Record the order of application because reversing percentage discounts produces the same result for pure percentage reductions, but fixed-amount discounts and tax calculations can change it. The calculator is a planning and verification aid; it does not replace a seller's final invoice, contract terms, or local consumer-tax rules.
Double Discount Examples
Each second discount is applied to the price left after the first discount.
| Inputs | Output | Notes |
|---|---|---|
| $100 original price; 20% then 10% | $72.00 final price; 28.00% effective discount | The second 10% is $8, not $10. |
| $250 original price; 15% then 15% | $180.63 final price | Two equal discounts produce a 27.75% effective reduction. |
| $80 original price; 50% then 25% | $30.00 final price | The total savings are $50, or 62.50%. |
How to Use the Double Discount Calculator
- Enter the eligible price before any discounts.
- Enter the first promotion as a percentage.
- Enter the percentage that applies after the first promotion.
- Select Calculate to review the final price and effective discount.
Double Discount FAQ
Why are 20% and 10% not a 30% discount?
The second 10% applies to the 80% of price remaining after the first discount. The final price is therefore 72% of the original, which is a 28% effective discount.
Can I use this for more than two discounts?
Yes. Apply the first two discounts, then use the resulting final price as the original price for any later promotions. Repeat until every stacked percentage has been applied.
Does this include sales tax?
No. Add tax after calculating the discounted price unless the applicable tax rule or promotion specifies another method.
What if a coupon is a fixed dollar amount?
Subtract the fixed amount at the point required by the offer terms. Then calculate any percentage discount that follows it on the remaining eligible price.