Stacked Discount Calculator

What is a stacked discount calculator?

A stacked discount calculator applies two or three discounts in sequence — say a store sale, a promo code, then a member discount — to show the real final price and the true total percentage off. It catches the counterintuitive result that stacking discounts isn’t additive.

How this calculator works

• Enter the original price and up to three discounts.
• Each discount is applied to the already-reduced price, in order.
• The final price, total saved, and combined percentage off are shown.
• Leave extra discount fields at 0 to use fewer than three.

How to use the result

1. Compare the “total off” against the sum of the percentages — they differ, and the calculator shows why.
2. Use the final price for budget decisions, not the headline “% off”.
3. Check whether codes can really stack — many stores restrict promo codes to one per order.
4. Add tax on top of the discounted price — sales tax applies after discounts.

Why don’t stacked discounts add up?

Because each discount applies to the previous total, not the original. A $200 item at 20% off drops to $160, then 10% off that is $144 — a 28% total reduction, not 30%. The more discounts you stack, the smaller each one’s effective contribution becomes.

Common mistakes

• Adding the percentages. 20% + 10% is not 30% off — it’s 28%.
• Applying discounts to the original price twice. Each discount hits the running total, not the list price.
• Forgetting tax and shipping. Discounts apply to the pre-tax subtotal; shipping is usually undiscounted.

Stacked discount math is the reverse of the markup calculator’s price setting — one prices up, the other discounts down. The sales tax calculator finishes the job by adding tax to the discounted total.