What is the Amazon FBA Fee Calculator?
The Amazon FBA Fee Calculator estimates the three Amazon fees that turn a "30% gross margin" product into a "12% net margin" reality: the referral fee (a category-based percentage of sell price), the fulfilment fee (a per-unit charge based on size and weight), and the monthly storage fee (a charge per cubic foot of warehouse space your inventory occupies). It then subtracts your COGS, PPC ad spend, and return-rate losses to estimate net profit per unit.
If you've ever used Amazon's official "Revenue Calculator," you know it gives you a single number with no breakdown and no scenario testing. This calculator shows you every line so you can see which fee is killing your margin and what to fix.
How to use it
- Retail price. Your list price after Subscribe & Save discounts and any coupon you're running. If you change pricing seasonally, model both the regular and sale price.
- Landed COGS. Manufacturer cost + inbound freight + duty + inspection. If you're using a freight forwarder, include their fees. This is the "all-in" cost to get the unit into an Amazon warehouse.
- Category. Picks the referral fee. The most common rate is 15%. Consumer electronics (8%), PCs (6%), and some grocery sub-categories (8%) are notably lower. Jewelry, watches, and Amazon-device accessories run higher.
- Size tier. Amazon assigns every SKU to a size tier based on longest side, median side, shortest side, and weight. Small standard products (≤1 lb, under 15×12×0.75 in) get the cheapest fulfilment fees. Most everyday products fall into Large standard.
- Shipping weight + dim weight. Amazon bills you on the greater of actual weight or dimensional weight. Dimensional weight = (L × W × H) ÷ 139 in cubic inches per pound. Always model both.
- Months in FBA. How long a unit sits in the warehouse on average — sell-through divided by inventory weeks. Slow-moving inventory accumulates monthly storage fees.
- Units per cubic foot. Used to allocate the storage fee. A small bottle might fit 50 per cubic foot; a large cushion only 4.
- PPC ad spend per unit. Total Amazon Ads spend ÷ units sold in the same window. Most launches sit at $2–$6 per unit. Mature products optimize to $0.50–$2.
- Return rate. Amazon refunds the referral fee on most returns (you keep a portion) but you eat the cost of the returned unit if it can't be re-sold. Use category benchmarks: apparel 20–30%, electronics 8–12%, home goods 3–8%.
Who should use this calculator
- Private-label founders sourcing on Alibaba and trying to estimate margin before placing the PO.
- Resellers / wholesalers evaluating whether a $20 retail product can absorb FBA fees and still leave 25% margin.
- Existing FBA sellers diagnosing why a SKU's profit is lower than expected — the breakdown shows whether it's referral, fulfilment, storage, or PPC eating the margin.
- Brand acquirers / aggregators running quick due diligence on a target's SKU economics.
- Multi-channel operators comparing FBA economics against TikTok Shop, Shopify, or 3PL self-fulfilment.
Amazon FBA fees explained (2026)
Referral fee
A percentage of the buyer-paid price, set per category. Roughly 80% of products land in 15% categories. Common alternates:
| Category | Referral fee |
|---|---|
| Apparel, beauty, home, kitchen, toys | 15% |
| Consumer electronics | 8% |
| Computers / PCs | 6% |
| Grocery (under $15) | 8% |
| Health & personal care | 8–15% |
| Jewelry & watches | 16–17% |
| Amazon device accessories | 45% (special) |
Minimum referral fee is $0.30 per item regardless of category.
FBA fulfilment fee
A per-unit charge that covers pick, pack, and ship. Approximate 2026 rates for standard-size products:
| Size tier | Approx weight range | Fulfilment fee |
|---|---|---|
| Small standard | ≤4 oz | $3.06 |
| Small standard | 4–8 oz | $3.15 |
| Small standard | 8–16 oz | $3.34 |
| Large standard | ≤4 oz | $3.43 |
| Large standard | 4–8 oz | $3.53 |
| Large standard | 8–16 oz | $3.78 |
| Large standard | 1–2 lb | $4.86 |
| Large standard | 2–3 lb | $5.55 |
| Large bulky | 0–50 lb | $10.40 + $0.40/lb above 1 lb |
| Extra large | 50–70 lb | $18.85 + $0.40/lb above 51 lb |
Apparel and dangerous goods carry additional surcharges. Q4 (October–January) adds a peak-season surcharge of around $0.30–$1.50 per unit.
Monthly storage fee
Charged on cubic feet of warehouse space. 2026 rates:
| Period | Standard-size | Oversize |
|---|---|---|
| January – September | $0.87 / cu ft / month | $0.56 / cu ft / month |
| October – December | $2.40 / cu ft / month | $1.40 / cu ft / month |
If your inventory has been in FBA for more than 271 days, an aged-inventory surcharge applies on top — $1.50–$6.90 per cubic foot depending on age. Always exit dead SKUs before they age in.
Worked example: a $24.99 candle
COGS $5.50 · Apparel/home 15% referral · Large standard · 1.5 lb shipping weight · 2.0 lb dim weight · 1.5 months avg in FBA · 20 units/cu ft · PPC $2.50/unit · 5% returns
Result: Referral fee $3.75, fulfilment fee ≈ $4.86 (uses higher of weight or dim weight), storage ≈ $0.07, COGS $5.50, PPC $2.50, return loss $1.25. Net profit ≈ $7.06 per unit, ~28% net margin.
Move to Q4 storage rates and the storage line jumps 3× — still small in absolute dollars, but for low-velocity products it can decide the SKU.
Common FBA pricing mistakes
- Using actual weight without checking dim weight. A light but bulky product (pillow, foam) gets billed on dim weight, not shipping weight.
- Forgetting peak-season surcharge. Q4 storage rate is ~3× the off-peak rate. Don't model annual P&L using January storage costs.
- Ignoring removal fees. If a SKU underperforms and you want it back, removal is $0.97–$3.50 per unit. Account for it as a sunk cost on launch.
- Counting "ad sales" as additional revenue. PPC clicks bring buyers who would mostly have bought organically anyway, especially branded keywords. Don't double-count.
FAQs
Next step
If your net margin per unit is healthy, use the Ad ROAS Calculator to find the break-even ACoS / ROAS you can afford. If you're sourcing in China and want to compare landed cost scenarios, run the Shipping Cost Estimator. For multi-channel sellers, the same SKU on TikTok Shop or Shopify may carry a very different margin profile — worth checking.