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Amazon FBA calculator,
know your real margin.
Enter your product cost, selling price, and dimensions to instantly see your referral fee, FBA fulfillment fee, storage cost, net profit, margin, and break-even price — with a full per-unit breakdown.
Net Profit
$7.94
per unit
Net Margin
39.7%
of price
ROI
159%
on cost
Revenue allocation
Per-unit breakdown
| Selling price | $20.00 | |
| Referral fee | 15.0% | −$3.00 |
| FBA fulfillment fee | Large Standard | −$3.90 |
| Storage fee | 3 mo · 0.069 ft³ | −$0.16 |
| Product cost | −$5.00 | |
| Net Profit | $7.94 | |
Break-even price: $10.66 — the minimum you must charge to cover all costs and fees.
Total Amazon fees: $7.06 (35.3% of selling price)
FBA fee guide
How Amazon FBA fees are calculated
Selling on Amazon through Fulfillment by Amazon (FBA) gives you access to Prime customers and Amazon's logistics network — but it comes at a price. Understanding exactly which fees apply to your product is essential to pricing it profitably. Most sellers are surprised to find that total Amazon fees often consume 30–40% of their selling price.
Referral fees
Amazon charges a referral fee on every sale — a percentage of the total selling price including any shipping charges. The rate varies by product category:
- Most categories: 15% (Home & Kitchen, Toys, Office Products, etc.)
- Electronics & Baby Products: 8% — lower because margins are thinner
- Clothing & Accessories: 17%
- Jewelry: 20% up to $250, 5% above $250
- Books, Music, DVDs: 15% with a $1.80 minimum
The referral fee is charged as a percentage of the total sales price (not just the product cost), so a higher selling price increases the absolute referral fee — even at the same percentage rate. This is why break-even analysis requires accounting for referral fees as a proportion of the selling price, not a fixed cost.
FBA fulfillment fees
FBA fulfillment fees cover picking, packing, and shipping your product to the customer. They are charged per unit shipped and are determined by your product's size tier — based on the weight and dimensions of the packaged item (not just the product itself).
Amazon defines six size tiers:
- Small Standard: ≤ 15" × 12" × 0.75", ≤ 12 oz — from $3.06/unit
- Large Standard: ≤ 18" × 14" × 8", ≤ 20 lbs — from $3.68/unit
- Small Oversize: ≤ 60" × 30", ≤ 70 lbs — from $9.61/unit
- Medium Oversize: ≤ 108", ≤ 150 lbs — from $19.97/unit
- Large Oversize: ≤ 108", ≤ 150 lbs — from $89.98/unit
- Special Oversize: anything larger — from $158.49/unit
Staying within the Large Standard tier is crucial for cost control. A product that just barely misses the standard size cut-off can jump from a $4–6 fulfillment fee to a $9+ oversize fee, destroying margins on lower-priced products.
Storage fees
Amazon charges monthly inventory storage fees based on the cubic footage your products occupy in their fulfillment centers. These fees are highly seasonal:
- Standard size (Jan–Sep): $0.78 per cubic foot/month
- Standard size (Oct–Dec, peak): $2.40 per cubic foot/month — 3× higher
- Oversize (Jan–Sep): $0.56 per cubic foot/month
- Oversize (Oct–Dec, peak): $1.40 per cubic foot/month
For a product stored during the Q4 peak season, storage costs can multiply three-fold. Products with low turnover that sit in Amazon's warehouses for months — or worse, trigger aged inventory surcharges after 181+ days — can see storage erode their entire margin.
Net profit and break-even price
Net profit per unit is your selling price minus all costs and fees:
The break-even selling price — the minimum price at which you neither profit nor lose — accounts for the fact that referral fees are charged as a percentage of the selling price itself:
This formula is important because many sellers mistakenly calculate break-even by simply summing all their costs, forgetting that as they raise their price to cover costs, the referral fee increases too.
Common FBA pricing mistakes
- Ignoring storage fees: A slow-moving product with a 6-month storage duration at Q4 rates can add $1–3 per unit in storage fees for a typical small product. This often makes otherwise profitable products unprofitable.
- Using the wrong size tier: Even small packaging changes — reducing box dimensions by an inch — can move a product from oversize to large standard, saving $5+ per unit in fulfillment fees.
- Not factoring in returns: Amazon's return rate for some categories (apparel, electronics) can be 15–30%. Each returned unit still incurs a return processing fee.
- Underestimating advertising costs: PPC (Pay-Per-Click) advertising spend is often $1–4 per unit sold for competitive categories and must be modeled into margin calculations.
- Category arbitrage: Some products qualify for multiple categories. Listing in the correct (lower-fee) category while remaining compliant can significantly improve margins.
FBA vs. FBM (Merchant Fulfilled)
FBA isn't always the most profitable fulfillment method. For heavy, large, or slow-moving products, Fulfillment by Merchant (FBM) may offer better margins — especially for sellers with existing warehousing infrastructure. The trade-off is losing the Prime badge and having to manage shipping, which can reduce conversion rates by 10–30%. FBA makes the most sense for small, high-velocity products priced above $15 where fulfillment fees represent less than 20% of the selling price.
Disclaimer
This calculator uses Amazon's published 2024 FBA fee schedule for illustrative purposes. Fee rates, size tier definitions, and referral percentages are subject to change by Amazon and may vary by product subcategory, seller account type, or promotional programs. Always verify current fees using Amazon Seller Central's official FBA Revenue Calculator before making sourcing or pricing decisions. This tool does not account for returns processing fees, aged inventory surcharges, removal fees, advertising costs, or VAT/tax obligations.