Discount Calculator — Price After Discount, Savings & Tax
This free discount calculator computes the exact amount you save, the discounted price before tax, and the final price you pay after tax — in seconds. It also supports Reverse mode: if you know a sale price and the discount percentage, it calculates what the original price was before the discount.
Whether you're comparing sale prices in a shop, calculating bulk-order savings, or verifying checkout totals, this tool handles the maths so you don't have to.
How Discount Calculations Work
Discounted Price = Original Price − Discount Amount
Tax Amount = Discounted Price × (Tax % ÷ 100)
Final Price = Discounted Price + Tax Amount
Original Price = Pre-tax Sale Price ÷ (1 − Discount % ÷ 100)
Discount Amount = Original Price − Pre-tax Sale Price
Worked Examples
Stacking Discounts — Are They Additive?
When multiple discounts apply (e.g. a 20% member discount on top of a 30% sale), they are not simply added together. Each discount applies to the price remaining after the previous one:
The formula: Effective % = 1 − (1 − d₁)(1 − d₂). For stacked discounts, run this calculator twice — first with the sale discount, then apply the membership discount to the result.
What Different Discount Levels Mean
| Discount | You pay | You save on $100 | Typical context |
|---|---|---|---|
| 5% | 95% | $5 | Loyalty reward, small promo |
| 10% | 90% | $10 | Common member or newsletter discount |
| 15% | 85% | $15 | Seasonal sale, first-order discount |
| 20% | 80% | $20 | Black Friday, clearance |
| 25% | 75% | $25 | Quarterly sale event |
| 30% | 70% | $30 | End-of-season, flash sale |
| 50% | 50% | $50 | Half-price, liquidation |
| 70% | 30% | $70 | Clearance, going-out-of-business |
Frequently Asked Questions
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