10% + 20% Off Calculator
10% off + 20% off = 28% total — not 30%. See the math and the exact price for any amount.
$
%
%
Final Price
$72.00
Real % Off
28%
If 0% Simply Added
$70.00
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The most common online stacking scenario: a store runs 20% off sitewide, and you apply a 10% loyalty coupon at checkout. You get 28% off — not 30%. On a $150 order, you pay $108 instead of the $105 you might expect from 30% off. This 2% gap is where retailers build margin when promotions stack.
Step-by-Step on $100
Formula: Price × (1 − 10/100) × (1 − 20/100)
$100 × 0.90 = $90.00 (after 10% off)
$90.00 × 0.80 = $72.00 (after another 20% off)
Real discount: 28% — not 30%
Quick Reference: 10% + 20% Off
| Original | After 10% off | After 20% more off | You save |
|---|---|---|---|
| $20 | $18 | $14.40 | $5.60 |
| $50 | $45 | $36 | $14 |
| $100 | $90 | $72 | $28 |
| $150 | $135 | $108 | $42 |
| $200 | $180 | $144 | $56 |
| $300 | $270 | $216 | $84 |
| $500 | $450 | $360 | $140 |
| $1000 | $900 | $720 | $280 |
Frequently Asked Questions
No. 10% then 20% gives the same final price as 20% then 10%. Multiplication is commutative: (1−10/100)×(1−20/100) = (1−20/100)×(1−10/100).
The second discount applies to the already-discounted price, not the original. After 10% off, you have 90% of the price left. Taking another 20% off that gives 90% × 0.8 = 72% remaining — so -42% more than if the discounts truly stacked to 30%.
On any purchase, the gap = Price × 10 × 20 / 10,000. For $100: $2.00. For $500: $10.00. The larger the purchase, the more meaningful the difference.
Yes. Multiply a third factor: Price × (1−10/100) × (1−20/100) × (1−D3/100). Three 10% discounts would equal 27.1% total — not 30%.
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