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Amazon FBA Fee Calculatorの包括的な教育ガイドを準備中です。ステップバイステップの解説、数式、実例、専門家のヒントをお届けしますので、もうしばらくお待ちください。
The Amazon FBA Fee Calculator estimates the total Amazon fees per unit sold through Fulfillment by Amazon (FBA), including three primary fee components: the referral fee (8–20% of selling price by category, $0.30 minimum), the FBA fulfillment fee (size and weight based, ranging from $3.06 for small standard items to $10+ for large bulky items), and monthly storage fees (charged per cubic foot per month, with rates roughly tripling during Q4 holiday months). For arbitrage, wholesale, and private label sellers, this calculation determines whether a product is profitable before committing inventory and capital. Amazon FBA is the largest e-commerce fulfillment service globally, handling shipping, customer service, and returns for sellers across Amazon's marketplace. As of 2024, 73% of third-party sellers on Amazon use FBA, and FBA generates approximately $30 billion in annual fee revenue for Amazon. The fee structure has become increasingly complex over the past decade — what was once a simple referral fee has evolved into a multi-layered system that requires careful calculation to predict profitability accurately. Inaccurate fee modeling is the most common reason new Amazon sellers lose money on otherwise viable products. The fee structure rewards efficiency in multiple ways. Smaller, lighter products pay lower fulfillment fees. Faster-selling products pay less in storage fees (less time in warehouse). Higher-priced products in certain categories (electronics 8%, grocery 8%) pay lower referral percentages than lower-priced fashion items (17%) or jewelry (20%). Successful FBA sellers optimize their product portfolio around these incentives — favoring items under 1 pound, in categories with low referral percentages, and with fast inventory turnover. The calculator helps quantify these decisions before sourcing. This calculator helps sellers vet potential products by computing all FBA fees and net profit per unit for any combination of price, cost, category, size tier, weight, and storage duration. Enter your projected selling price, your cost from supplier, inbound shipping cost to send the product to Amazon, the product category, size tier (Small Standard, Large Standard, or Large Bulky), weight, and how many months you expect inventory to sit in Amazon's warehouses. The calculator applies current Amazon FBA fee schedules and returns net profit per unit, profit margin percentage, and a visual breakdown of where each dollar of the sale goes.
Net Profit = P − max($0.30, P × Ref%) − FulfillFee(size, weight) − (CuFt × StorageRate × Months) − C − InboundShipping
- 1Step 1 — Enter Selling Price and Item Cost: Input the price at which you plan to list the product on Amazon (P) and your cost per unit from supplier (C). For wholesale/private label, C is typically the manufacturing cost plus any per-unit prep services. For arbitrage, C is your retail purchase price plus any tax or shipping you paid.
- 2Step 2 — Add Inbound Shipping: Enter the cost per unit to ship inventory to Amazon FBA warehouses (IS). For domestic shipments via Amazon Partnered Carrier, this is typically $0.50–$1.50/unit. For international sea freight, $1–$3/unit is common. For air freight on small items, $2–$5/unit. This cost is often overlooked but adds meaningfully to per-unit COGS.
- 3Step 3 — Select Product Category for Referral Fee: Amazon charges different referral fees by category. Common rates: General/Most categories 15%, Clothing 17%, Electronics/Grocery 8%, Beauty 15%, Books 15%, Toys 15%, Jewelry 20%, Watches 16%, Sports 15%. The minimum referral fee is $0.30 — for items under $2, this minimum makes FBA economically unviable in most cases.
- 4Step 4 — Choose Size Tier and Weight: Amazon categorizes products into size tiers that determine fulfillment fees. Small Standard: ≤12×9×0.75 inches, ≤1 lb. Large Standard: ≤18×14×8 inches, ≤20 lbs. Large Bulky: above those dimensions, up to 50 lbs. Oversize: >50 lbs or extra-large. Enter weight in pounds for the calculator to apply the correct fulfillment fee from Amazon's published schedule.
- 5Step 5 — Estimate Storage Months: Enter how long you expect inventory to sit in FBA warehouses on average. Fast-moving products (high sales velocity) average 1–2 months. Standard products average 3–4 months. Slow movers average 6+ months. Long-term storage surcharges apply after 271 days. The calculator uses Q1–Q3 base storage rates by default; multiply storage costs by ~3× if inventory will be in warehouse during October–December (Q4 holiday rates).
- 6Step 6 — Calculate Total Fees: The calculator sums three fee components: Referral Fee = max($0.30, P × Ref%), Fulfillment Fee = based on size tier and weight from Amazon's schedule, Storage Fee = cubic feet × monthly rate × storage months. Total FBA fees typically range from 20% (large-ticket items with low referral percentage) to 50%+ (small-ticket items where the minimum referral fee and fixed fulfillment fee dominate).
- 7Step 7 — Compute Net Profit and Margin: Net Profit = Selling Price − Total Fees − Item Cost − Inbound Shipping. This is your per-unit margin before income tax, marketing costs (PPC ads), and inventory financing costs. Target 25%+ margin to remain profitable after PPC advertising (typically eats 8–15% of revenue) and to absorb the inevitable returns and damaged inventory (1–3% of units).
Healthy product — 33% margin allows for PPC advertising while maintaining profit
A $25 product with $8 COGS leaves $17 of gross before FBA fees. FBA takes $7.27 (about 29% of revenue), leaving $8.23 net profit. This is a typical successful FBA product profile. PPC advertising will likely consume 8–12% of revenue ($2–3 per unit), bringing true net to $5–6 per unit — still profitable but tight. Faster inventory turn (1–2 months instead of 3) would save another $0.06 in storage.
Electronics category benefits from low 8% referral fee; 45% margin is excellent
Electronics enjoys an 8% referral fee vs the standard 15%, saving $3.15 per unit on this $45 product. The Large Standard fulfillment fee ($5.78 for 2 lb) is higher than Small Standard but offset by the lower referral. At 45% margin, this product has strong unit economics — even with aggressive PPC spending of 15% ($6.75), net profit would still be $13.67/unit. This is the kind of product profile that scales well to 5,000+ units/month.
Marginally viable — high storage duration eats into margin; consider liquidating slower
Books typically have slower turnover (6 months in this example) which doubles storage costs vs a 3-month average. At 22.7% margin, this product is barely viable after PPC (5–8% of revenue minimum for any visibility) brings true net to ~$2/unit. Books sellers often use a different strategy: buy used books for very low cost ($0.50–$2) and accept thinner margins on high volume. Long-term storage fees beyond 271 days would make this product unprofitable.
Unprofitable — fulfillment fee exceeds selling price by itself
Low-priced items are notoriously difficult on FBA because the fulfillment fee ($3.06 minimum for Small Standard) exceeds many low-ticket products' selling prices. This product loses $2.05 per unit. Generally, $10 should be the minimum FBA price point, and $15+ is safer. Below $10, only items qualifying for Small and Light program (Amazon's reduced-fee program for low-cost items) can be profitable, and that program has been restricted in recent years.
Vetting wholesale or arbitrage deals before purchasing inventory — calculating exact net margin to ensure profitability across thousands of dollars in inventory commitment
Comparing FBA vs FBM (merchant fulfillment) profitability for the same product, especially for heavy or bulky items where Amazon's fees may exceed direct shipping costs
Identifying products where FBA fees consume more than 30% of revenue — typically poor candidates without exceptional margins or velocity
Modeling Q4 holiday storage impact for products manufactured 90+ days before peak season — balancing stockout risk against tripled storage rates
Evaluating private label opportunities by computing minimum viable selling price given supplier costs, weight, and category referral fees
| Category | Referral Fee % | Notes |
|---|---|---|
| Electronics | 8% | Lowest standard rate; phones, computers, accessories |
| Grocery & Gourmet | 8% | Shelf-stable items |
| Most General Categories | 15% | Home & kitchen, office, pet, garden, etc. |
| Beauty | 15% | Cosmetics, skincare, haircare |
| Books | 15% | Plus $1.80 closing fee for media items |
| Toys & Games | 15% | Holiday-driven category with high Q4 storage exposure |
| Sports & Outdoors | 15% | Often Large Bulky size tier |
| Watches | 16% | Slightly higher than general |
| Clothing | 17% | Highest rate among major categories |
| Jewelry | 20% | Highest standard rate; plus $0.30 minimum applies more often |
What is the minimum referral fee on Amazon?
Amazon charges a $0.30 minimum referral fee regardless of the category percentage. For items under $2, this minimum makes FBA effectively unviable because the minimum referral plus the fulfillment fee ($3.06 for Small Standard) far exceeds the selling price. As a rule of thumb, $10 is the practical minimum FBA price, and $15+ provides healthy margin headroom for most products.
When do Q4 storage fees apply?
October, November, and December — typically 3× the off-peak rate. Q4 storage fees are $2.40/cu ft for Small Standard (vs $0.78 off-peak) and $1.40/cu ft for Large Standard (vs $0.56 off-peak). Plan inventory to minimize Q4 storage exposure unless your holiday-driven sales are large enough to offset the higher cost. Some sellers deliberately run inventory low into Q4 to avoid storage fees, then accept potential stockouts during the highest-demand period.
What is the long-term storage fee?
Items in FBA for over 271 days incur a $6.90/cu ft surcharge applied monthly on top of regular storage fees. For Small Standard items, this is roughly $0.28/unit/month additional. Slow-moving inventory should be removed via FBA's removal/disposal program before crossing this threshold. The 271-day clock resets when units sell — so a single sale of an SKU resets the entire SKU's count to 0 days for the remaining inventory.
How are FBA fulfillment fees calculated?
Amazon publishes a fee schedule by size tier and weight. Small Standard (≤12×9×0.75 inches, ≤1 lb): $3.06–$3.43 depending on exact weight. Large Standard (≤18×14×8 inches, ≤20 lbs): $3.65–$6.05+ scaling with weight. Large Bulky/Oversize: starts at $9.61 with significant per-pound surcharges. The fee covers picking, packing, shipping, returns processing, and customer service. Amazon adjusts the schedule annually; the current calculator uses 2024 Q1 figures.
What is the Small and Light program?
Small and Light is Amazon's reduced-fee program for low-cost ($10 or less), small (under 16 oz), fast-moving products. It offers significantly lower fulfillment fees ($2.39 for Small Standard items in the program vs $3.06 standard) but with restrictions: must be priced under $10, must ship in under 24 hours from receipt, and must meet minimum sales velocity. The program has been increasingly restricted and selective since 2023. Use only if your specific product qualifies and meets the velocity requirements.
Should I use FBA or FBM (Merchant Fulfilled)?
FBA wins for most products under 5 lbs, in categories where Prime eligibility matters (most categories), and when you sell more than ~20 units/month. FBM (you ship from your own warehouse) wins for heavy/bulky items where Amazon's fulfillment fees exceed your direct shipping costs, slow-moving items where storage fees would dominate, hazardous materials that FBA cannot handle, and very high-margin items where 24-hour customer service quality matters more than Prime convenience. Many sellers run hybrid setups: FBA for fast movers, FBM for everything else.
What other costs should I factor in beyond FBA fees?
Beyond the three primary FBA fees (referral, fulfillment, storage), budget for: (1) PPC advertising — 8–15% of revenue is typical for visibility; (2) Inventory financing — if you fund inventory with debt or credit cards, that interest is a real cost; (3) Returns and refunds — typically 1–3% of units come back, sometimes unsellable; (4) Inbound shipping prep — bagging, labeling, FNSKU stickers can add $0.10–$0.50/unit; (5) Income tax on profits. After all these, your true take-home margin is typically 60–70% of the gross margin shown in this calculator.
プロのヒント
Use Amazon's Revenue Calculator (free in Seller Central) alongside this tool to verify fees against the actual SKU lookup. Discrepancies often reveal mislabeled size tiers — most commonly, items marked Small Standard that should be Large Standard. The Revenue Calculator uses real-time fee data pulled from your specific category and product dimensions, while this calculator uses representative averages. Always trust the Revenue Calculator for final sourcing decisions.
ご存知でしたか？
Amazon FBA was launched in 2006 with just 3 fulfillment centers in the US. As of 2024, Amazon operates over 1,200 fulfillment and sortation centers globally, employing over 1.5 million people. FBA handles approximately 4.5 billion units per year. The fulfillment fee structure has been adjusted 11 times since launch, and the 2024 fees represent a roughly 60% increase from 2018 fees on equivalent products — reflecting both inflation and Amazon's investment in faster delivery and broader category coverage.