Discount Calculator
Calculate discounted prices, the discount amount and the effective percentage off, including stacked discounts.
Breakdown
| Starting price | 10,000.00 |
|---|---|
| After discount 1 (−20%) | 8,000.00 |
| After discount 2 (−10%) | 7,200.00 |
Results
| Final price (after discounts) | 7,200.00 |
|---|---|
| You save | 2,800.00 |
| Effective discount | 28.00% |
How to use
Enter the original price and up to three discount percentages (leave a field blank to skip it). Discounts are applied in order, and the price after each step is shown in the breakdown. Formula: next price = current price × (100 − discount) ÷ 100.
Stacked discounts do not simply add up. 20% off followed by 10% off gives price × 0.8 × 0.9 = price × 0.72, an effective discount of 28%, not 30%.
With "Add tax after discounts" enabled, tax = discounted price × rate ÷ 100 is added on top of the discounted price and the total to pay is shown.
Notes
Money math uses decimal arithmetic and results are displayed to 2 decimal places. A shop's own rounding rule (floor or ceiling) may differ. All calculations run entirely in your browser.
FAQ
Why is "20% off + 10% off" not 30% off?
Because the second discount applies to the already discounted price: 10,000 × 0.8 = 8,000, then 8,000 × 0.9 = 7,200, which is 28% off in total.
Is tax calculated before or after the discount?
This tool applies tax to the discounted price, which is the common treatment.