10% + 30% Off Calculator
10% off + 30% off = 37% total — not 40%. See the math and the exact price for any amount.
$
%
%
Final Price
$63.00
Real % Off
37%
If 0% Simply Added
$60.00
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Black Friday + App Coupon Stack
Black Friday offers 30% sitewide. Your store app has an extra 10% coupon. Shoppers assume 40% total. Actual: 37%. On a $299 electronics item, the difference is $8.97 — you pay $188.37 instead of $179.40. This is one of the highest-volume stacking scenarios of the year, played out across billions in holiday purchases.
Step-by-Step on $100
Formula: Price × (1 − 10/100) × (1 − 30/100)
$100 × 0.90 = $90.00 (after 10% off)
$90.00 × 0.70 = $63.00 (after another 30% off)
Real discount: 37% — not 40%
Quick Reference: 10% + 30% Off
| Original | After 10% off | After 30% more off | You save |
|---|---|---|---|
| $20 | $18 | $12.60 | $7.40 |
| $50 | $45 | $31.50 | $18.50 |
| $100 | $90 | $63.00 | $37.00 |
| $150 | $135 | $94.50 | $55.50 |
| $200 | $180 | $126.00 | $74.00 |
| $300 | $270 | $189 | $111 |
| $500 | $450 | $315 | $185 |
| $1000 | $900 | $630 | $370 |
Frequently Asked Questions
No. 10% then 30% gives the same final price as 30% then 10%. Multiplication is commutative: (1−10/100)×(1−30/100) = (1−30/100)×(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 30% off that gives 90% × 0.7 = 63% remaining — so -23% more than if the discounts truly stacked to 40%.
On any purchase, the gap = Price × 10 × 30 / 10,000. For $100: $3.00. For $500: $15.00. The larger the purchase, the more meaningful the difference.
Yes. Multiply a third factor: Price × (1−10/100) × (1−30/100) × (1−D3/100). Three 10% discounts would equal 27.1% total — not 30%.
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