Discount Calculator (Percent Off)
Find the sale price after a percentage off, see exactly how much you save, and optionally add sales tax to get the final checkout price.
How this calculation works
The sale price is the original price multiplied by (1 − discount ÷ 100).
The amount saved is the original price minus the sale price.
If you enter a tax rate, the final price multiplies the discounted price by (1 + tax ÷ 100).
Worked example
Stacking discounts is not additive
Two 20%-off deals are not 40% off. Applying them in sequence keeps 80% of 80%, so you pay 0.8 × 0.8 = 0.64 — a 36% discount, not 40%. The more discounts you stack, the bigger this gap becomes.
What percent off means you keep
The share of the price you still pay after a discount:
| Discount | You pay | You save |
|---|---|---|
| 10% off | 90% | 10% |
| 25% off | 75% | 25% |
| 33% off | 67% | 33% |
| 50% off | 50% | 50% |
| 70% off | 30% | 70% |
Markup vs. margin
These use different bases and are easy to confuse. Markup is profit as a percent of cost; margin is profit as a percent of the selling price. A 50% markup on a 100 cost sells for 150, which is only a 33% margin. Sellers quote markup; the margin is always the smaller number.
Mind the anchor price
A big "was/now" gap makes a deal feel larger. The original price is an anchor that shapes perception, so judge a discount by the final price and whether you would buy it at that price, not by the size of the percentage.