Discount Calculator
Calculate sale prices, find discount percentages, or determine original prices. Supports double discounts and sales tax.
Sale Price
You Save
| Discount | Sale Price | You Save | Multiplier |
|---|---|---|---|
| 10% off | $90.00 | $10.00 | × 0.90 |
| 15% off | $85.00 | $15.00 | × 0.85 |
| 20% off | $80.00 | $20.00 | × 0.80 |
| 25% off | $75.00 | $25.00 | × 0.75 |
| 30% off | $70.00 | $30.00 | × 0.70 |
| 40% off | $60.00 | $40.00 | × 0.60 |
| 50% off | $50.00 | $50.00 | × 0.50 |
| 60% off | $40.00 | $60.00 | × 0.40 |
| 75% off | $25.00 | $75.00 | × 0.25 |
Complete Guide to Calculating Discounts
How Discounts Work
A discount is a reduction from the original price, expressed as a percentage. To calculate a discounted price, multiply the original price by (1 − discount/100). For a 25% discount on $80: $80 × 0.75 = $60.
Stacked / Double Discounts
When two discounts are applied one after another (e.g., "20% off + extra 10% off"), they do not simply add up. A 20% + 10% stacked discount = 28% total, NOT 30%. This is because the second discount applies to the already-reduced price: $100 × 0.80 × 0.90 = $72, not $70.
Discount vs. Markup
A discount reduces price (customer perspective), while a markup increases cost to selling price (retailer perspective). A 50% markup on a $60 cost = $90 selling price, but a 50% discount on $90 = $45 — less than the original cost. They are not inverse operations.
Frequently Asked Questions
How much is 20% off $50?
$50 × 0.20 = $10 discount. Sale price = $50 − $10 = $40.00.
Is "buy one get one 50% off" the same as 25% off?
Yes! If both items are the same price, BOGO 50% = 25% off the total. But if items differ, the cheaper one should be the discounted item.
How do I find the original price from a sale price?
Divide the sale price by (1 − discount/100). If a shirt is $60 after 25% off: $60 ÷ 0.75 = $80 original price.