Stacked discounts are multiplied, not added: 20% off and then 10% off is 28% off in total, not 30%. The order of the discounts doesn’t change the final price.
How to use the Double Discount Calculator
- Original price
- First discount
- Second discount
- Sales tax
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the original price and each discount percentage, plus sales tax if you want it included.
Tips
- Know the difference between margin (profit ÷ price) and markup (profit ÷ cost).
- Apply successive discounts one after another – they do not simply add up.
- Check whether prices already include sales tax or VAT.
- Round prices only at the very end of the calculation.
Common mistakes to avoid
- Adding discount percentages together.
- Pricing from a target margin using the markup formula.
- Forgetting payment-processing and shipping fees.
Inputs explained
| Field | What to enter |
|---|---|
| Original price | Amount in your currency |
| First discount | In % |
| Second discount | In % |
| Sales tax | In % |
What each result means
- Final price = [Original price]×(1 – [First discount]÷100)×(1 – [Second discount]÷100)
- You save = [Original price] – [Final price]
- Equivalent single discount = (1 – (1 – [First discount]÷100)×(1 – [Second discount]÷100))×100
- Final price with sales tax = [Final price]×(1 + [Sales tax]÷100)
Example values
How the main result changes when Original price changes and everything else stays at the example values above:
| Original price | Final price |
|---|---|
| 100 | 72 |
| 150 | 108 |
| 200 | 144 |
| 250 | 180 |
| 300 | 216 |
| 400 | 288 |
Formula
Final price = price × (1 − d1) × (1 − d2)Equivalent single discount = 1 − (1 − d1) × (1 − d2)Worked example
Inputs — Original price: $200; First discount: 20 %; Second discount: 10 %; Sales tax: 0 %.
Results — Final price = $144.00; You save = $56.00; Equivalent single discount = 28 %; Final price with sales tax = $144.00.
Frequently asked questions
Do stacked discounts add up?
No – each applies to the already-reduced price, so the total is less than the sum.
Does the order of the discounts matter?
No, the result is the same in any order.
Is sales tax charged before or after discounts?
Usually on the discounted price.
What formula does the Double Discount Calculator use?
Final price = price × (1 − d1) × (1 − d2).