15% + 15% Off Calculator
15% off + 15% off = 27.75% total — not 30%. See the math and the exact price for any amount.
$
%
%
Final Price
$72.25
Real % Off
27.75%
If 0% Simply Added
$70.00
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Double Loyalty: Bank Card + Store Membership
Some banks offer 15% off at partner stores, and the store itself gives 15% off to members. Customers expect 30% combined. Actual: 27.75%. On a $200 purchase, you'd expect $60 off — you save $55.50. Stacking two identical discounts always undershoots the naive sum, and the gap grows with the discount size.
Step-by-Step on $100
Formula: Price × (1 − 15/100) × (1 − 15/100)
$100 × 0.85 = $85.00 (after 15% off)
$85.00 × 0.85 = $72.25 (after another 15% off)
Real discount: 27.75% — not 30%
Quick Reference: 15% + 15% Off
| Original | After 15% off | After 15% more off | You save |
|---|---|---|---|
| $20 | $17 | $14.45 | $5.55 |
| $50 | $42.50 | $36.13 | $13.88 |
| $100 | $85 | $72.25 | $27.75 |
| $150 | $127.50 | $108.38 | $41.63 |
| $200 | $170 | $144.50 | $55.50 |
| $300 | $255 | $216.75 | $83.25 |
| $500 | $425 | $361.25 | $138.75 |
| $1000 | $850 | $722.50 | $277.50 |
Frequently Asked Questions
No. 15% then 15% gives the same final price as 15% then 15%. Multiplication is commutative: (1−15/100)×(1−15/100) = (1−15/100)×(1−15/100).
The second discount applies to the already-discounted price, not the original. After 15% off, you have 85% of the price left. Taking another 15% off that gives 85% × 0.85 = 72.25% remaining — so -42.25% more than if the discounts truly stacked to 30%.
On any purchase, the gap = Price × 15 × 15 / 10,000. For $100: $2.25. For $500: $11.25. The larger the purchase, the more meaningful the difference.
Yes. Multiply a third factor: Price × (1−15/100) × (1−15/100) × (1−D3/100). Three 10% discounts would equal 27.1% total — not 30%.
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