SKU Cost Meaning: What It Really Costs to Sell on Marketplaces
10 min read
Last month, SKU B07X lost 12% margin. We thought it was a winner, but buried in the fees was a $3.20 referral fee we missed. SKU cost isn't just what you pay the supplier. It's every fee, every refund, every shipping cost eating into your profit. If you're still guessing at SKU costs, you're leaving money on the table. Let's break down what SKU cost really means and how to calculate it like a pro.
SKU Cost vs. Product Cost: Why the Difference Matters
Your supplier quotes $10 for a widget. Great, right? Not so fast. That's the product cost, not the SKU cost. The SKU cost includes everything: platform fees, shipping, ads, refunds. Last quarter, we sold that $10 widget on Amazon with a 15% referral fee, $2.50 FBA fee, and $1.20 shipping. Suddenly, your $10 product cost is now a $14.70 SKU cost. Ignore this, and you'll price yourself into the red.
How to Calculate SKU Cost Accurately (With Real Numbers)
We switched fulfillment in March and saw SKU costs drop 8%. Here's how to do it right. Start with your product cost. Add platform fees (Amazon's 15%, eBay's 12.85%, etc.). Don't forget shipping—FBA, eBay's calculated, or your own rates. Then tack on ads (we spend 8-12% of revenue), refunds (aim for under 3%), and any other costs. That's your true SKU cost.
Why SKU Cost Analysis Is Critical for Marginal Sellers
If you're a marginal seller, SKU cost analysis isn't a nice-to-have—it's survival. We had a seller friend who thought he was breaking even. Turns out, he was losing $0.47 per unit after accounting for all fees. Run profit margin analysis monthly. Tools like Gomarginify automate this, showing you exactly where you're bleeding cash.
SKU Cost Across Marketplaces: Amazon, eBay, and Beyond
Amazon's fees are straightforward but high. eBay's more complex but often lower. Shopify can be cheaper if you handle fulfillment yourself. We've seen SKU costs vary by 15-20% across platforms for the same product. Test, compare, and pick the best fit for your margins.
Step by step
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Step 1: Track Every Fee
List every fee for each marketplace. Amazon's 15% referral fee, eBay's 12.85%, Shopify's 2.9% + $0.30 per transaction. Don't forget fixed fees like $0.30 per item on eBay or $0.45 on Amazon.
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Step 2: Include Shipping Costs
FBA charges $2.41 to $4.71 per item, depending on size and weight. eBay's calculated shipping varies by category. If you handle shipping yourself, factor in postage, packaging, and labor.
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Step 3: Account for Ads and Refunds
Ads typically run 8-12% of revenue. Refunds should be under 3%. If you're seeing higher, dig into why. We once had a 7% refund rate on a bestseller—turned out the images were misleading.
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Step 4: Use a Profit Dashboard
Tools like Gomarginify connect to 10 marketplaces and show true net profit per SKU. It's the fastest way to spot losing SKUs and fix them.
FAQ
What's the difference between SKU cost and Azure SKU cost?
Azure SKU cost refers to Microsoft's cloud pricing structure. It's unrelated to marketplace selling. For ecommerce, focus on platform fees, shipping, and ads.
How do I find SKU cost for Costco items?
Costco's bulk pricing can lower per-unit costs. Calculate SKU cost the same way—add Costco's price, shipping, and any reselling fees. We've seen Costco bulk buys drop SKU costs by 15-20%.
Can I use an Azure SKU cost calculator for ecommerce?
No, Azure SKU calculators are for cloud services. For ecommerce, use a profit dashboard or spreadsheet to track all costs.
What's a good profit margin for marketplace selling?
Aim for 20-30% after all costs. Below 15%, and you're at risk. We once had a 5% margin SKU—killed it immediately.
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