Discounts are easy to misjudge, especially when stacked. Two successive 20% discounts give 36% off, not 40%.
How to use it
Enter the original price and the discount percentage. Add a sales tax rate if it is charged on the discounted price.
Compare deals
A fixed amount off is better than a percentage off when the price is low; a percentage off wins on expensive items. Calculate both.
Inputs explained
| Field | What to enter |
|---|---|
| Original price | Amount in your currency |
| Discount | In % |
| Sales tax (optional) | In % |
What each result means
- Price after discount = [Original price] × (1 – [Discount]÷100) × (1 + [Sales tax (optional)]÷100)
- You save = [Original price] × [Discount]÷100
Example values
How the main result changes when Discount changes and everything else stays at the example values above:
| Discount (%) | Price after discount |
|---|---|
| 12.5 | 105 |
| 18.75 | 97.5 |
| 25 | 90 |
| 31.25 | 82.5 |
| 37.5 | 75 |
| 50 | 60 |
Formula
Sale price = price × (1 − discount %) × (1 + tax %)Savings = price × discount %Worked example
Original price 120 with 25% off.
Savings = 120 × 0.25 = 30. Sale price = 90.
Key terms
- List price
- The original, undiscounted price.
- Stacked discount
- Applying one discount after another.
Frequently asked questions
How do I calculate two discounts?
Multiply: price × (1 − d₁) × (1 − d₂).
How do I find the discount percentage?
Type the sale price into the result box.
Is tax charged before or after discount?
Usually after, on the reduced price.
What formula does the Discount Calculator use?
Sale price = price × (1 − discount %) × (1 + tax %).
Can I work backwards from the result?
Yes. Type the result you want into Price after discount and the calculator finds the matching discount.