About the Amazon FBA Fee Calculator
This calculator estimates net profit per unit for a product sold through Amazon's Fulfilled by Amazon program, after the three fee types that eat into every FBA sale: the referral fee, the fulfillment fee, and monthly storage. It is built for sellers who already know their selling price, product cost, and Amazon's fee schedule for their category and size tier. The output shows both a dollar profit figure and a margin percentage, so a seller can compare profitability across different products at a glance.
How It Works
You enter the selling price, product cost (COGS), the referral fee as a percentage of price, and the FBA fulfillment fee and monthly storage fee as flat dollar amounts per unit. The calculator converts the referral fee percentage into a dollar amount based on selling price, adds it to the fulfillment and storage fees to get total Amazon fees, then subtracts both product cost and total fees from the selling price to find net profit per unit. Margin is that net profit expressed as a percentage of selling price.
Examples
A standard-size item at the default fee levels
A $24.99 item costing $6.50 to produce, with a 15% referral fee, a $5.50 fulfillment fee, and a $0.40 monthly storage fee, comes out to about $9.65 in total Amazon fees and roughly $8.84 in net profit per unit, a margin of about 35.4%.
A lower referral-fee category with higher fulfillment cost
A $39.99 item costing $12.00, in an 8% referral fee category, with a $7.20 fulfillment fee and a $0.60 storage fee, produces about $11.00 in total fees and roughly $16.99 in net profit per unit, a margin near 42.5%.
Advantages
- Breaks a single sale price down into every fee layer Amazon charges, instead of leaving sellers to estimate 'take-home' profit by feel.
- Makes it easy to test how a price change or a different fulfillment tier would move net profit and margin before committing to it.
- Surfaces referral fee and total fees as separate line items, useful for sourcing decisions across product categories with different commission rates.
Common Mistakes
- Pricing a product based on selling price minus product cost alone, without accounting for the referral fee, fulfillment fee, and storage fee Amazon deducts from every sale.
- Using a storage fee figure from a slow season and carrying it into the fourth quarter, when Amazon's peak-period storage rates are substantially higher.
- Applying a generic referral fee percentage across all products, when Amazon's referral fee actually varies by category, commonly landing between about 8% and 17%.
Edge Cases to Watch For
- If selling price is zero or negative, the calculator returns an error, since price is the base every other figure is calculated from.
- Monthly storage fee is entered as a flat per-unit amount, but Amazon's actual storage fees vary by cubic footage and by season, rising substantially during the October through December peak period, so this figure needs updating seasonally for accuracy.
- The FBA fulfillment fee is a direct input rather than something the calculator derives from Amazon's size and weight tiers, so the result is only as accurate as the fee figure you look up and enter for your product's specific tier.
- Costs like PPC advertising spend, return processing, and long-term storage surcharges are not part of this calculation, so the margin shown reflects fulfillment and referral costs only, not full landed profitability.
Common Use Cases
- Amazon sellers deciding whether a new product idea can hit a target margin before committing to inventory.
- Existing FBA sellers checking whether a supplier price increase or a fee change still leaves the product profitable.
- Sourcing teams comparing net profit per unit across multiple product categories with different referral fee rates.