Discount Calculator
Find the sale price after any discount. Supports stacked discounts and reverse calculation.
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When to use this
You're standing in a store staring at a $249 jacket with a "40% off" sign and you want to know the actual price before you get to the register. Or an online retailer is running "25% off sitewide + extra 15% for members" and you need to know if the final price is really worth it. Maybe you found an item for $67 that was originally $89 and you want to know the discount percentage for comparison shopping. These are all the same problem: translating a percentage into real dollars.
The stacked discount feature is where most people get tripped up. "20% off plus an extra 20% off" sounds like 40% off, but it's actually 36% off. The second discount applies to the already-reduced price, not the original. Retailers know this math is confusing — this calculator makes it transparent so you can see exactly what each layer of discount does to the final price.
The reverse calculator solves the opposite problem: you know the original price and the sale price, and you want the percentage discount. This is useful for comparing deals across different stores where one lists the sale price and the other lists the discount percentage.
Good to know
Stacked discounts are multiplicative, not additive. Two 20% discounts don't equal 40% off. The math: $100 x 0.80 x 0.80 = $64, which is 36% off. Three 10% discounts yield 27.1% off, not 30%. The gap between the "sounds like" number and the real number grows with each additional discount layer.
Order doesn't matter for stacked percentages. 30% off then 20% off gives the same result as 20% off then 30% off. Multiplication is commutative: 0.70 x 0.80 = 0.80 x 0.70. This only applies to percentage discounts — if one discount is a fixed dollar amount, order matters.
Tax applies after the discount. Sales tax is calculated on the discounted price, not the original price. A $100 item at 25% off with 8% tax costs $81.00, not $83.00. The discount saves you money on tax too.
"Up to X% off" means the maximum discount. Most items in the sale will be discounted less. Retailers use the highest discount in marketing but most inventory is at the lower end. Always check the actual percentage on the item you want.
Quick Reference
| Stacked Discounts | Sounds Like | Actual Total Discount | $100 Item Final Price |
|---|---|---|---|
| 10% + 10% | 20% off | 19.0% off | $81.00 |
| 20% + 10% | 30% off | 28.0% off | $72.00 |
| 20% + 20% | 40% off | 36.0% off | $64.00 |
| 30% + 20% | 50% off | 44.0% off | $56.00 |
| 25% + 25% | 50% off | 43.75% off | $56.25 |
| 50% + 20% | 70% off | 60.0% off | $40.00 |
| 30% + 20% + 10% | 60% off | 49.6% off | $50.40 |