Plug in price, cost, weight and dimensions. See referral fees, FBA fulfillment fees, storage, profit, ROI and margin in real time. All math runs in your browser.
15% referral fee
162% ROI is workable but thin — recheck after PPC and returns.
1. Referral fee = max(15% of $24.99, $0.30) = $3.75
2. Size tier → Large standard (longest 8", median 5", shortest 2", 0.75 lb)
3. Dim weight = (L × W × H) ÷ 139 = 0.58 lb · billable = 0.75 lb
4. FBA fulfillment fee at this tier/weight = $4.20
5. Cubic feet = (L × W × H) ÷ 1728 = 0.046 cu ft · low season $0.04, peak $0.11
6. Total fees (low season) = $3.75 + $4.20 + $0.04 = $7.99
7. Profit = $24.99 − $6.50 − $7.99 = $10.50
8. ROI = $10.50 ÷ $6.50 = 161.5% · Margin = $10.50 ÷ $24.99 = 42.0%
Fee rates based on Amazon Seller Central published rates (US marketplace, 2026 schedule). Amazon updates fees annually and applies surcharges (inbound placement, low-inventory-level) that aren't modeled here. Verify in Seller Central before large purchases.
Alexandria AI's sourcing chat pulls live ASIN data, runs this same fee math automatically against the real Amazon SP-API, and tells you which products are actually worth buying. Also free, no signup.
Two main fees: a referral fee (typically 8–17% of the sale price depending on category) and an FBA fulfillment fee (a flat per-unit charge based on size and weight, ranging from about $3.06 for a small-standard item up to $150+ for oversized items). On top of that, Amazon charges monthly storage fees per cubic foot and may add long-term storage surcharges for inventory aged over 271 days.
Referral fees are a percentage Amazon takes for letting you sell on the marketplace — they apply to every seller, FBA or FBM. FBA fulfillment fees are separate, flat per-unit fees that cover Amazon picking, packing and shipping the order. You only pay FBA fees if you use Fulfillment by Amazon.
Profit = Selling Price − Cost of Goods − Referral Fee − FBA Fulfillment Fee − Storage Fee (and any other variable costs like inbound shipping or PPC). ROI is profit divided by cost of goods. Margin is profit divided by selling price.
Most experienced FBA sellers target a minimum 30% ROI after fees and cost of goods. ROI between 15–30% is workable for high-velocity SKUs but leaves little room for PPC or returns. Below 15% is generally a 'skip' unless you have a strategic reason to carry the SKU.
Yes. Standard-size items run about $0.78/cubic foot Jan–Sep and $2.40/cubic foot Oct–Dec. Oversize items run about $0.56 and $1.40 respectively. Long-term storage surcharges apply to inventory aged 271+ days.
Amazon updates FBA fees annually, typically in January. Recent years have seen low single-digit percentage increases on fulfillment fees plus new surcharges (inbound placement, low-inventory-level fee). Always check Amazon Seller Central for current rates before sourcing.
Yes — completely free, no signup, no email. All math runs in your browser. If you want this calculation run automatically across every ASIN you're considering, try Alexandria AI's full sourcing chat at thealexandria.ai/chat (also free).
