Amazon FBA Calculator

Calculate your Amazon FBA profit margins before you sell. Enter your product price, cost of goods, shipping to Amazon, and product dimensions/weight — and get back your net profit, ROI, FBA fees, and profit margin instantly. Understand exactly what Amazon takes and what you keep on every sale. Also try the find Best Deal with Unit Price / Price Per Unit Calculator.

Selling Price *

The price you plan to sell the product for on Amazon.

Cost of Goods (per unit) *

Your total landed cost per unit including manufacturing and customs.

Shipping to Amazon (per unit) *

Your cost to ship inventory to Amazon's fulfillment center, per unit.

Other Costs (per unit)

Any additional costs such as prep, labeling, or photography amortized per unit.

Product Category *

Amazon's referral fee percentage varies by category.

Product Size Tier *

FBA fulfillment fees are determined by the product's size tier.

Estimated Monthly Units Sold

Used to estimate monthly revenue and profit projections.

Monthly Storage Fee (total)

Amazon charges monthly storage fees based on cubic feet used. Enter your estimated total.

Results

Net Profit per Unit

Profit Margin

ROI

Amazon Referral Fee

FBA Fulfillment Fee

Total Amazon Fees

Estimated Monthly Profit

What is an Amazon FBA Calculator?

An Amazon FBA Calculator helps sellers estimate the profitability of a product before listing it on Amazon. It takes into account your selling price, cost of goods, Amazon's referral fees, FBA fulfillment fees, and other costs to show your net profit, margin, and ROI per unit. See also our PayPal Fee Calculator.

How does Amazon calculate FBA fulfillment fees?

Amazon bases FBA fulfillment fees on a product's size tier, which is determined by its dimensions and weight. Smaller, lighter products fall into the 'Small Standard' tier with lower fees, while larger or heavier products move into standard or oversize tiers with higher fees.

What is the Amazon referral fee?

The referral fee is a percentage of the total selling price that Amazon charges for every sale. It varies by product category — typically ranging from 8% to 20%. Most categories charge 15%. This fee is in addition to any FBA fulfillment fees.

What is a good profit margin for Amazon FBA?

Most experienced Amazon FBA sellers aim for a net profit margin of at least 20–30% and an ROI of 50% or higher. Margins below 15% leave little room for ad spend, returns, or price competition. Products with margins above 30% are generally considered strong candidates. You might also find our use the Sales Calculator (all variables) useful.

Does this calculator include Amazon storage fees?

Yes — you can enter your estimated monthly storage fees, which are then divided across your monthly unit sales to calculate the per-unit storage cost. Amazon charges storage fees monthly based on the cubic footage your inventory occupies in their fulfillment centers.

What is ROI in the context of Amazon FBA?

ROI (Return on Investment) measures how much profit you earn relative to what you spent to source the product. For FBA, it's calculated as (Net Profit ÷ Total Cost per Unit) × 100. A 100% ROI means you doubled your money on every unit sold.

How is this FBA calculator different from Amazon's own Revenue Calculator?

Amazon's own Revenue Calculator requires you to search by ASIN and is designed for comparison between fulfillment methods. This calculator is a quick standalone tool where you can input any product details manually to get an instant profitability breakdown without needing to look up an ASIN.

Can I use this calculator before sourcing a product?

Absolutely — that's its primary use case. Before committing to a supplier or buying inventory, enter your target selling price, estimated cost of goods, and shipping costs to see whether a product is worth pursuing. If the margin or ROI doesn't meet your threshold, you can adjust pricing or sourcing costs to find a viable scenario.