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Shopify vs Amazon FBA Profit Calculator

Run the same SKU through both channels. See net profit, margin, and which one's actually worth your warehouse space.

Product + traffic
$
$

Shopify

$

Total ad spend ÷ orders, blended with organic.

%

Realistic: 1.5–3.5%.

%

Amazon FBA

%

8% (consumer electronics) to 17% (jewelry). Most categories: 15%.

$

Small standard: $3.50. Large: $7+.

%

Realistic: 18–35%. Below 15% is excellent.

%

Shopify net / month

$15,462

39.4% margin on $39,200

Amazon FBA net / month

$7,697

19.6% margin on $39,200

Winner per month

Shopify · $7,764 more

Range
Three honest scenarios, not one fake number.

Conservative

$5,388

Realistic

$15,462

Aggressive

$21,646

Bands move on CAC swings and ad efficiency, not unit volume.

Biggest lever
The one variable that moves your result the most.
Average order value (price)

At this CAC, your unit economics work. Now AOV is what scales profit — a $5 price bump or bundle drops straight to the bottom line.

Reality check
✅Realistic

Conversion sits in the healthy middle of public DTC benchmarks.

The math
No black box. Here's exactly what we did.
  • Shopify profit = revenue − returns − COGS − CAC − payment fees − $39/mo
  • Amazon profit = revenue − returns − COGS − (15% referral) − $5.50/unit fulfillment − (ACoS × revenue)
  • Payment fees (Shopify) = 2.9% × net revenue + $0.30 × orders
Related tools
Pair this with the calculator next door.
Shopify Store Revenue CalculatorAmazon FBA Profit CalculatorDropshipping Profit CalculatorShopify Sales Tax & Profit

Common questions

Why is Shopify's per-unit profit usually higher?▾

Shopify charges 2.9% + 30¢ payment processing and ~$39/mo platform fee. Amazon's referral fee alone is 8–15%, FBA fulfillment is $3–$8/unit, and storage adds up. The gap is real — but Shopify makes you find every customer.

Why might Amazon still win?▾

Volume. A mid-tier Shopify store doing 50 orders/day is doing well. Amazon can move that in an hour if your listing ranks. If you can't drive paid traffic profitably, Amazon's organic discovery is the ballgame.

What's a realistic Shopify conversion rate?▾

1.5%–3.5% across most categories. Above 4% is excellent. Below 1% means traffic-quality or product-market-fit work to do.

Are advertising costs included?▾

Yes. Shopify uses your blended CAC across ads + organic. Amazon uses your ACoS (ad spend ÷ ad revenue) on PPC. Both compress real margin substantially.

What about returns and chargebacks?▾

Toggle return rate. Amazon's customer-friendly returns run 5–15% in most categories; apparel hits 25%+. Shopify returns are typically half that because customer expectations differ.