Amazon FBA

How Amazon FBA Works

Net Profit = Price − COGS − Referral Fee − FBA Fee − Storage Fee

Referral Fee

Category Referral Fee — Amazon charges 8-20% of the sale price depending on product category.

FBA Fee

Fulfillment by Amazon Fee — Per-unit fee for Amazon to pick, pack, and ship your product based on weight and dimensions.

Storage Fee

Monthly Inventory Storage — Fee for storing your inventory in Amazon's fulfillment centers (higher Oct-Dec).

How to Use

1. Enter your Amazon selling price and product cost (landed cost).
2. Enter the packaged weight of the unit.
3. Select the product category for the correct referral fee percentage.
4. View net profit, margin, ROI, and itemized fee breakdown.

Quick Reference

Common Uses

• •Product sourcing evaluation -- analyze potential products before purchasing inventory to verify that margins are viable after all Amazon fees
• •Pricing strategy -- determine the minimum selling price needed to maintain target margins across different product categories and weight tiers
• •Fee comparison across categories -- compare how profitability changes if a product is listed in different Amazon categories with different referral fee percentages
• •Inventory planning -- estimate total fee burden per unit to forecast monthly and annual profit across projected sales volumes
• •ROI analysis -- calculate return on investment including all fees to compare Amazon FBA against other sales channels like eBay, Shopify, or wholesale

Understanding the Result

Worked Examples

Frequently Asked Questions

Are advertising costs included in this calculator?

No. Amazon PPC (Pay-Per-Click) advertising is a major additional cost not included here. Many sellers spend 15-30% of revenue on ads, especially for new products.

What is the difference between FBA and FBM?

FBA (Fulfilled by Amazon) has Amazon warehouse and ship your products. FBM (Fulfilled by Merchant) means you ship directly to customers. FBA typically wins the Buy Box more reliably but has higher fees.

What margins should I target for Amazon FBA?

Most successful FBA sellers target 25-40% net margins before advertising. After ads, a 15-20% net margin is sustainable. Below 10% net is very difficult to build a profitable business.

How does the FBA fulfillment fee change with weight?

FBA fulfillment fees increase with weight and size tier. Small standard items under 1 lb cost around $3.22 to fulfill. Large standard items up to 21 lbs have base fees plus $0.38 per additional pound over 3 lbs. Oversize items over 90 lbs cost $89.98 plus $0.83 per additional pound over 90 lbs. Dimensional weight may also apply for large but lightweight items. Always check the latest Amazon fee schedule, as rates are adjusted annually.

What is the referral fee and how does it vary by category?

The referral fee is Amazon's commission on each sale, typically 8-20% of the selling price. Electronics and Beauty/Health categories have the lowest referral fees at 8%. Jewelry has the highest at 20%. Most standard categories like Home, Sports, and Books are 15%. Apparel and Accessories are 17%. There is also a minimum per-item referral fee ($0.30 for most categories). Category selection when listing a product can significantly affect profitability.

What other costs should FBA sellers consider?

Beyond the fees shown in this calculator, successful sellers account for: Amazon PPC advertising (typically 15-30% of revenue for new products), return processing fees (FBA charges the fulfillment fee again for returned items), long-term storage fees (for inventory held over 365 days), removal or disposal fees (for unsold inventory), and prep service fees (if using a third-party to label and prep items). Many experienced sellers find that all-in costs including advertising represent 35-50% of the selling price.

Pro Tips

• →Always include your actual landed cost (manufacturing + freight + customs + inspection + labeling), not just the per-unit manufacturing price. A product that costs $3/unit to manufacture in Shenzhen may have a landed cost of $6-7/unit after: sea freight ($1-2/unit for a 40ft container), US customs duties (0-25% depending on product category and country of origin -- check the USITC HTS database), freight forwarder fees ($0.50-1/unit), Amazon labeling/prep ($0.50-1/unit), and 3PL receiving/inspection ($0.50-1/unit). Forgetting freight and duties is the most common new-seller profit-killer.
• →Use the Amazon Revenue Calculator (Seller Central > Inventory > Revenue Calculator) for exact FBA fees on specific ASINs. This free calculator gives you the exact fulfillment fee for any specific product by ASIN, accounting for both actual weight and dimensional weight. The fee estimates in this calculator are based on weight tiers and are approximate -- dimensional weight may increase your actual fee. Large but lightweight items (pillows, comforters, foam products) are particularly affected because their dimensional weight far exceeds actual weight.
• →Factor PPC advertising costs into your profit model before sourcing any product. A realistic PPC budget for a new FBA product: 15-30% of revenue for the first 3-6 months while building organic ranking, tapering to 10-15% for established products with strong organic positions. A product with 25% net margin before ads becomes barely profitable (5-10%) after a 20% ad spend. The "Rule of 40" is a useful guideline: your pre-ad margin + your organic rank velocity should sum to at least 40 for a sustainably profitable product. If your pre-ad margin is 30% and you have strong organic ranking (low ad dependency), you are well above 40. If your pre-ad margin is 15% and you are ad-dependent, you are in trouble.
• →Watch for long-term storage fees (LTSF) if inventory sits in Amazon warehouses for more than 365 days. For inventory aged 271-365 days, Amazon charges a long-term storage fee of approximately $1.50 per cubic foot per month (in addition to the monthly storage fee of $0.75/cu ft). For inventory aged 365+ days, the fee jumps to $6.90 per cubic foot per month or $0.15 per unit, whichever is greater. A slow-moving product with 1,000 units in storage can accumulate thousands in LTSF fees over a year. Proactive sellers set up automated removal orders for inventory approaching 270 days and either liquidate the stock (eBay, wholesale lots, liquidation marketplaces), run promotional discounts to clear it, or have it returned to a 3PL.
• →Consider dimensional weight, not just scale weight. Amazon charges the GREATER of actual weight and dimensional weight (length x width x height in inches / 139 for standard-size items). A product weighing 1 lb in a 20x15x3 inch box has dimensional weight of (20x15x3)/139 = 6.47 lbs, so you pay the 6+ lb fulfillment rate ($5.29 + 3.47 x $0.38 = $6.61) rather than the 1 lb rate ($3.22). This more than doubles the fulfillment cost. The solution: optimize packaging to reduce dimensional weight. Changing that 20x15x3 box to 18x13x3 reduces dimensional weight to (18x13x3)/139 = 5.05 lbs, saving money. Custom packaging that fits the product snugly pays for itself in FBA fee savings within months.
• →Plan inventory for Q4 (October-December) with precision. Monthly storage fees triple from $0.75/cu ft (Jan-Sep) to $2.40/cu ft (Oct-Dec). A shipment of 5,000 units arriving in September that does not sell through until January will incur 4 months of elevated storage fees at $2.40/cu ft vs $0.75/cu ft -- a difference that can erase the Q4 profit margin on slow-moving SKUs. Time your Q4 inventory to arrive in late October/early November (not September) so the expensive storage window is shorter, and use Amazon's Inventory Performance Index (IPI) dashboard to monitor sell-through rate.
• →Bundle products to improve margins. Instead of selling a single garlic press for $24.99 with $3.75 referral + $3.22 FBA fees ($6.97 total fee on $24.99 = 27.9%), create a bundle: garlic press + peeler + cleaning brush + recipe guide for $34.99 at 0.9 lbs. Referral fee: $5.25. FBA fee: $3.22 (still under 1 lb). Total fees: $8.47 on $34.99 = 24.2%. The bundle increases perceived value more than it increases fees because the weight stays under the 1 lb threshold. Bundling is the most underused profit optimization strategy on FBA.

Limitations to Know

• •FBA fulfillment fees in this calculator are based on item weight only and DO NOT account for dimensional weight. Amazon charges the greater of actual weight and dimensional weight (L x W x H in inches / 139 for standard-size items). Large, lightweight items (pillows, blankets, foam products, empty storage bins, lampshades) will have dimensional weights far exceeding their actual weights, and their true FBA fee could be 2-5x higher than what this calculator shows. For large or bulky items, use the Amazon Revenue Calculator on Seller Central for exact dimensional-weight-based fees by ASIN.
• •Amazon adjusts FBA fees annually (typically in February) and occasionally mid-year. The fee schedule used in this calculator may not reflect the most current rates. Significant fee changes in recent years include: the introduction of dimensional weight pricing, the addition of a fuel and inflation surcharge (5% average increase across all tiers in 2022-2023), and the restructuring of oversize and large-standard tiers. Always verify current rates at Amazon Seller Central > Fulfillment by Amazon > FBA features and fees.
• •Storage fees shown are estimates based on weight and do not account for cubic footage, which is how Amazon actually bills monthly storage. Amazon charges $0.75 per cubic foot per month (January-September) and $2.40 per cubic foot (October-December) for standard-size products, based on the product's packaged dimensions. Products with inefficient packaging (large box, small product) pay disproportionately more storage fees than this calculator estimates. The calculator uses a rough weight-based estimate that may not reflect actual cubic-foot-based charges.
• •This calculator does NOT include: (a) Amazon PPC advertising costs (typically 15-30% of revenue for new/competitive products), (b) return processing fees (FBA charges the fulfillment fee again for returned items that are resellable), (c) long-term storage fees for inventory held 271+ days ($1.50-$6.90/cu ft), (d) removal or disposal fees for unsold inventory ($1.50-$3.00 per unit), (e) prep service fees if using a third-party to label, polybag, or bubble wrap items ($0.50-$2.00/unit), (f) costs of giveaways or promotional discounts for launch, (g) trademark/brand registry costs ($225-$525 per class), and (h) professional seller account fee ($39.99/month). All-in costs for an FBA product typically represent 35-55% of the selling price, well above what this calculator shows.
• •The calculator assumes all units sell at the listed price. In reality, competitive pressure may force price reductions, and Amazon's automated repricing tools can drive prices down as competitors match or undercut each other. Additionally, Amazon sometimes suppresses the Buy Box on listings where the price is not competitive relative to other e-commerce sites (including the brand's own website), which can reduce sales velocity dramatically. Successful sellers model a range of selling prices, not a single point estimate, to understand the profit profile at different competitive price points.

Sources

• Amazon Seller Central -- FBA Features and Fees
• Amazon Seller Central -- Referral Fees
• USITC Harmonized Tariff Schedule