Calculate sale price after a discount, and the effective margin you keep. Stop giving away profit without realizing it.
All calculations run in your browser. Nothing is sent to a server. Last updated: 2026-07-19 · Formula verified against published sources (see below).
Computes the sale price after a discount, and — crucially — the profit margin you keep at that sale price. Most discount tools only show the sale price. This one also shows whether you're still profitable after the discount, which is the only thing that matters.
Sale price = original price × (1 − discount %)
Profit at sale price = sale price − cost per unit
Margin at sale price = profit ÷ sale price × 100
A 20% discount does not cut your profit by 20%. On a $40 product with $10 profit (25% margin), a 20% discount ($8 off) cuts profit from $10 to $2 — an 80% profit reduction. Discounts always hit profit harder than they hit revenue, because the discount comes out of your margin, not your COGS.
Before running a sale, use this calculator to verify the post-discount margin is still positive. A "successful" sale that drives volume but loses money per order is worse than no sale at all.
| Input | Value |
|---|---|
| Original price | $40.00 |
| Discount | 20% |
| Cost per unit | $29.46 |
| Sale price | $32.00 |
| Profit at sale price | $2.54 |
| Margin at sale price | 7.94% |
Original margin was 26.35%. After a 20% discount, margin is 7.94% — a 70% reduction in margin for a 20% reduction in price. If your return rate is 20.8%, returns alone will erase this. The sale is effectively break-even at best.
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