20% + 20% Off Calculator
20% off + 20% off = 36% total — not 40%. See the math and the exact price for any amount.
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%
%
Final Price
$64.00
Real % Off
36%
If 0% Simply Added
$60.00
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Double 20%: The 40% That Isn't
Double 20% discounts appear at app-exclusive sales: the store runs 20% off AND your payment app cashback gives another 20%. Shoppers assume 40% total. The real number is 36%. On a $500 item, you'd expect to save $200 and pay $300. You actually save $180 and pay $320. That $20 gap is significant for large purchases like furniture or electronics.
Step-by-Step on $100
Formula: Price × (1 − 20/100) × (1 − 20/100)
$100 × 0.80 = $80.00 (after 20% off)
$80.00 × 0.80 = $64.00 (after another 20% off)
Real discount: 36% — not 40%
Quick Reference: 20% + 20% Off
| Original | After 20% off | After 20% more off | You save |
|---|---|---|---|
| $20 | $16 | $12.80 | $7.20 |
| $50 | $40 | $32 | $18 |
| $100 | $80 | $64 | $36 |
| $150 | $120 | $96 | $54 |
| $200 | $160 | $128 | $72 |
| $300 | $240 | $192 | $108 |
| $500 | $400 | $320 | $180 |
| $1000 | $800 | $640 | $360 |
Frequently Asked Questions
No. 20% then 20% gives the same final price as 20% then 20%. Multiplication is commutative: (1−20/100)×(1−20/100) = (1−20/100)×(1−20/100).
The second discount applies to the already-discounted price, not the original. After 20% off, you have 80% of the price left. Taking another 20% off that gives 80% × 0.8 = 64% remaining — so -24% more than if the discounts truly stacked to 40%.
On any purchase, the gap = Price × 20 × 20 / 10,000. For $100: $4.00. For $500: $20.00. The larger the purchase, the more meaningful the difference.
Yes. Multiply a third factor: Price × (1−20/100) × (1−20/100) × (1−D3/100). Three 10% discounts would equal 27.1% total — not 30%.
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