/ /Stacked Discount Calculator
Stacked Discount Calculator
Stack two percentage discounts plus a fixed coupon the right way — sequentially, not added. See the true final price, equivalent single discount, and why adding percentages overstates the cut.
Stacked Discount Inputs
Original Price ($)
First Discount (%)
Second Discount (%)
Extra Fixed Coupon ($)
Stacked Results
After First Discount$160.00
After Second Discount$144.00
Final Price$139.00
Total Savings$61.00
Equivalent Single Discount30.5%
Naive Added Rate (wrong)30.0%
Stacking truth: Stacked 20% + 10% plus $5.00 equals 30.5% off — not the naive 30%. Final price $139.00 saves shoppers $61.00.
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Authoritative References
Frequently Asked Questions
How do you calculate stacked discounts?
Apply each discount to the running price in sequence: Price x (1 - d1) x (1 - d2), then subtract fixed coupons. A 20% + 10% stack on $200 gives $200 x 0.80 x 0.90 = $144, a 28% equivalent — not 30%.
Why cant you just add discount percentages?
Because the second discount applies to an already-reduced price, not the original. Adding overstates savings and understates revenue — always multiply the keep-rates (1 - d) instead.
Does the order of stacked discounts matter?
No — multiplication commutes, so 20% then 10% equals 10% then 20%. Order only matters when fixed-amount coupons mix with percentages; apply percentages first per most store policies.
How do fixed coupons combine with percent discounts?
Subtract fixed coupons after all percentage discounts for the standard interpretation. State the order in promo terms to avoid checkout disputes.
How do I protect margin on stacked promos?
Cap the equivalent single discount at your maximum safe discount (see the maximum discount calculator) and limit stacking to one code per order in your promo engine.