Double Discount CalculatorStack 2–3 discounts and see the real combined %
A double discount calculator applies one discount after another and shows the real combined percentage. 25% off plus an extra 10% off is 32.5% off, not 35%: Final price = Price × (1 − d₁) × (1 − d₂).
- Up to 3 discounts
- % or $ per step
- Best-order check
- Price waterfall
By Manzoor Ahmad · 13+ years of web development & SEO · Updated October 25, 2026Stack your discounts
Discounts are applied in order, each to the already-reduced price. Leave discount 3 at 0 for a double discount.
Price waterfall
What Is a Double Discount?
A double discount is two price reductions applied one after the other, where the second discount is taken from the already-reduced price. That is why 25% off plus an extra 10% off is a 32.5% discount, not 35%. The combined rate is 1 − (1 − d₁) × (1 − d₂).
Double and Triple Discount Formulas
Final price
Final = Price × (1 − d₁) × (1 − d₂)$80 × 0.75 × 0.90 = $54.00.
Combined discount
Combined % = 1 − (1 − d₁)(1 − d₂)1 − 0.75 × 0.90 = 0.325 = 32.5%.
Triple discount
Combined % = 1 − (1 − d₁)(1 − d₂)(1 − d₃)30%, 20% and 10%: 1 − 0.7 × 0.8 × 0.9 = 49.6%.
Quick shortcut for two
Combined % = d₁ + d₂ − (d₁ × d₂ ÷ 100)25 + 10 − (25 × 10 ÷ 100) = 35 − 2.5 = 32.5%.
Double Discount Chart: Real Combined Percentages
Find the first discount on the left and the extra discount across the top.
| First discount | + extra 10% | + extra 15% | + extra 20% | + extra 25% | + extra 30% |
|---|---|---|---|---|---|
| 10% off | 19% | 23.5% | 28% | 32.5% | 37% |
| 20% off | 28% | 32% | 36% | 40% | 44% |
| 25% off | 32.5% | 36.25% | 40% | 43.75% | 47.5% |
| 30% off | 37% | 40.5% | 44% | 47.5% | 51% |
| 40% off | 46% | 49% | 52% | 55% | 58% |
| 50% off | 55% | 57.5% | 60% | 62.5% | 65% |
Triple Discounts: Sale + Coupon + Loyalty Reward
| Three discounts | Looks like | Real discount |
|---|---|---|
| 30% + 20% + 10% | 60% | 49.6% |
| 25% + 25% + 10% | 60% | 49.38% |
| 50% + 20% + 10% | 80% | 64% |
| 40% + 15% + 5% | 60% | 51.55% |
Does the Order of Discounts Matter?
For percentage discounts, no: 25% then 10% gives exactly the same price as 10% then 25%, because multiplication works in any order. Mixing a dollar coupon with a percentage discount is different.
Percent first, then $20 off
$100 × 0.75 − $20 = $55.00The dollar coupon is worth its full $20.
$20 off first, then percent
($100 − $20) × 0.75 = $60.00The percentage now applies to a smaller number, costing you $5 more.
For the shopper, the percentage discount should come first. Stores set the order in their coupon terms; the calculator always applies discounts in the order you enter them and shows the cheaper order when you mix types.
Worked Example: 25% Off Plus an Extra 10%
- Apply the first discount. $80 × (1 − 0.25) = $60.00.
- Apply the second to the new price. $60 × (1 − 0.10) = $54.00.
- Find the total saving. $80 − $54 = $26.00.
- Convert to one percentage. $26 ÷ $80 = 32.5% — the single discount that gives the same price.
Checking a whole cart with different item discounts? Use the Black Friday Calculator. For single discounts, the Discount Calculator is faster.
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Double Discount Calculator FAQs
Apply the first discount, then apply the second discount to the reduced price. For $80 with 25% then 10% off: $80 × 0.75 = $60, then $60 × 0.90 = $54.
No. It equals 28% off, because the extra 10% is taken from the already-discounted price: 1 − 0.80 × 0.90 = 0.28.
Combined discount = d₁ + d₂ − (d₁ × d₂ ÷ 100). For 25% and 10%: 25 + 10 − 2.5 = 32.5%.
No. 25% then 10% and 10% then 25% both give a 32.5% combined discount, because multiplying the remaining shares (0.75 × 0.90) works in any order.
Yes. Taking the percentage first and the dollar coupon second always leaves you with the lower price. On $100 with 25% off and $20 off, percent first gives $55 and dollar first gives $60.
It is a 52% combined discount. A $100 item drops to $60, then to $48.
It is 60% off in total, not 70%. A $100 item becomes $50, then $40.
Multiply the remaining shares together and subtract from 1. For 30%, 20% and 10%: 1 − 0.70 × 0.80 × 0.90 = 0.496, or 49.6% off.
Not with percentage discounts below 100%. Each discount leaves some of the price behind, so the combined rate gets closer to 100% but never reaches it.
Because the two numbers look bigger together than the real combined discount. The calculator shows both so you can judge the deal on the real percentage.
Store discounts are applied first and tax is charged on the final reduced price in most US states. Add your rate in the tax field to see the total.
Yes. It is free, has no sign-up and runs entirely in your browser.
Manzoor Ahmad
Founder of DexoCalc · 13+ years of web development & SEO experience
Manzoor built this double discount calculator to answer the most common checkout surprise: stacked coupons that are worth less than they look. The combined-discount chart and order analysis come straight from the formulas shown here.
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Last reviewed and updated: October 25, 2026
Sources & References
- Federal Trade Commission — Guides Against Deceptive Pricing, 16 CFR Part 233
- Federal Trade Commission — Consumer Advice: Shopping and Saving
- Tax Foundation — State and Local Sales Tax Rates
Disclaimer: results are estimates for planning and comparison. Store policies, coupon terms and local tax rules vary, so your receipt may differ. This calculator is not financial, legal or tax advice.