80% Off: sale price, savings and the reverse calculation
Take 80% off $899.00 and you pay $179.80, a saving of $719.20. This page is the reference for 80% discounts: sale prices, the reverse calculation from a sale price back to the original, and what happens when a second discount is stacked.
Take 80% off any price
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How the discount is calculated
saving = original × 80/100
Sale price = original × (1 − 80/100). For $899.00: $899.00 × 0.2 = $179.80. The saving is the difference, $719.20, or original × 80/100 directly.
80% off common prices
| Original price | Price after 80% off | You save |
|---|---|---|
| $9.99 | $2.00 | $7.99 |
| $19.99 | $4.00 | $15.99 |
| $29.99 | $6.00 | $23.99 |
| $49.99 | $10.00 | $39.99 |
| $79.99 | $16.00 | $63.99 |
| $99.99 | $20.00 | $79.99 |
| $149.99 | $30.00 | $119.99 |
| $199.99 | $40.00 | $159.99 |
| $499.99 | $100.00 | $399.99 |
| $999.99 | $200.00 | $799.99 |
A second discount on top of 80%
If a coupon for 25% is applied after the 80% sale discount, the customer pays 0.2 × 0.75 of the original, an effective 85% off rather than 105%. The table shows every combination for the usual coupon sizes.
| Discounts applied | Effective discount | Final price on $899.00 | Not |
|---|---|---|---|
| 80% then 5% more | 81% | $170.81 | 85% |
| 80% then 10% more | 82% | $161.82 | 90% |
| 80% then 15% more | 83% | $152.83 | 95% |
| 80% then 20% more | 84% | $143.84 | 100% |
| 80% then 25% more | 85% | $134.85 | 105% |
Reverse: from the sale price back to the original
To recover the original price from a 80%-off sale price, divide by 0.2. A sale price of $179.80 means an original of $899.00. Adding 80% back to $179.80 would give $323.64, which is too low.
Mental math for 80%
For a seller, 80% off is deeper than most gross margins: any product with a margin below 80% sells at a loss at this discount, and a product bought at keystone (50% margin) loses 30% of its cost on every unit. Use the Profit Margin Calculator to check the line before running the promotion.