Stacked Discount Calculator
Apply two discounts in sequence and see the real effective discount.
Stacking "20% off, then 10% off" is not 30% off. Enter a price and two discounts to see the price after each step and the true effective discount — handy for coupons and sale-on-sale offers.
Formula / method
Examples
72 (28% off, not 30%)
12.50 (75% off)
Why stacked discounts do not add
When two discounts apply one after another, they do not simply sum. A 20 percent cut followed by a 10 percent cut is not 30 percent off, because the second reduction is taken from the already-reduced price. This tool multiplies the remaining fractions: 80 percent of the price, then 90 percent of that, leaving 72 percent, which is a real discount of 28 percent, not 30.
Enter your two percentages and the tool shows the final price and the true effective discount, so you can see exactly what a 'extra 10 percent off sale prices' promotion is worth.
Order, and honest comparison
For pure percentage discounts the order does not change the final price, since multiplication is commutative: 20 then 10 lands at the same place as 10 then 20. Order only starts to matter when a fixed-amount coupon is mixed in, which this tool does not model.
Stacked discounts always undershoot the eye-catching sum, which is why 'take 50 percent off, then 50 percent off again' gives 75 percent off rather than a free item. To check a single discount or a plain percentage change, the percentage calculator on UtilGears is the simpler companion.
Where it's used
- Stacking a coupon code on top of an already-discounted sale price
- Working out a clearance item's final price with 'extra X% off the lowest marked price'
- Applying successive trade or wholesale discounts in sequence
- Combining a Black Friday promo with a member discount
- Comparing '40% off' against '25% then 20%' to see which is actually cheaper
Real-world examples
- A $200 jacket at 30% off then an extra 20% coupon costs $200 × 0.7 × 0.8 = $112, an effective 44% off — not 50%.
- A 25% discount followed by a 10% coupon on $80 gives $80 × 0.75 × 0.9 = $54 (37.5% off in total).
- Two successive 50% discounts leave 25% of the original price, not zero.
Did you know?
Stacked percentage discounts never simply add up: two 20% discounts applied one after another total 36% off, not 40%, because the second is taken from the already-reduced price.
FAQ
Why isn’t 20% + 10% equal to 30%?
The second discount applies to the already-reduced price, not the original. So stacked discounts are always less than their sum.