Discount Calculator: Sale Price, Savings & Stacked Coupons
Calculate the final price and total savings from an original price and a discount — stack a second coupon, add sales tax, and (for sellers) see how the markdown affects gross margin.
You Save
Original Price
Discount Sensitivity Matrix
Customer price and savings at common discounts — and, for sellers, the extra unit sales needed to keep gross profit dollars the same.
| Promotion Scenario | Effective Discount | Pre-Tax Price | Customer Savings | Gross Profit / Unit | Unit Margin | Volume Needed to Break Even |
|---|
Why 20% + 20% Is Not 40% Off
Checkout systems apply a second discount to the already-reduced price, so stacked percentages multiply rather than add:
The bigger the discounts, the bigger the gap between the "added" and the real figure.
Volume vs Margin: How Many Extra Units to Break Even?
Sellers often underestimate how many extra units a markdown needs. For a product with a 40% gross margin, a 20% discount halves the gross profit per unit.
How stacked discounts work
Apply discounts one after another, not by adding the percentages. 30% off then 10% off is 37% off, not 40%.
Example: a $150 jacket at 35% off is $97.50. A further 10% coupon on $97.50 saves $9.75, for a final price of $87.75.
More examples: discount calculator guide. To add sales tax on its own, use the Sales Tax Calculator.
By Suhaib Hassan · Formula verified 27 Sep 2026 · How CalculatePilot verifies formulas →
Frequently asked questions
How do I stack two discounts?
Apply them sequentially. 20% then 10% off is 28% off, not 30%.
How do I get the original price from a sale price?
Divide the sale price by (1 minus the discount as a decimal). $60 at 25% off was $80.
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