Estimate your Amazon profit, ROI and margin instantly.
This Amazon ROI Calculator helps sellers evaluate product opportunities at a business level — not just per unit. Enter your costs, monthly sales volume, and inventory order size to see monthly revenue, monthly and annual profit, total inventory investment, and annual return on investment. Use this to compare products, plan inventory purchases, and decide whether the capital required to run a product generates a return worth committing to.
Per-unit profit tells you whether a sale makes money. It does not tell you whether a product is worth building a business around. A product that earns $3 per unit sounds reasonable — until you realise it requires a $6,000 inventory investment to stay in stock for three months, sells 80 units a month, and generates $2,880 in annual profit on that capital. That is a 48% annual ROI. Another product earning $2 per unit, priced lower, selling 300 units a month, with a $4,500 inventory investment returns $7,200 annually — a 160% ROI on the same rough capital outlay. The per-unit numbers pointed to the first product. The business-level numbers point clearly to the second.
This calculator is built for that second layer of analysis — the one that actually determines whether a product deserves your time, capital, and operational attention.
A per-unit fee calculator answers the question: does this product make money on each sale? This calculator answers the question: does this product make sense as a business investment?
The difference is scale and capital. Two products can have identical per-unit profit and completely different business profiles depending on how fast they sell, how much inventory you need to carry, and how long that capital is tied up before it returns to you. Annual ROI accounts for all of this in a single number.
A product with a 30% per-unit margin that sells 50 units a month may return your inventory investment once or twice a year. A product with a 15% margin selling 400 units a month with a small reorder quantity might return it four or five times annually. The second product builds wealth faster even though the per-unit margin is lower.
Selling Price
What you charge on Amazon per unit. This drives revenue and is the base for calculating monthly and annual figures at your entered sales volume.
Product Cost
Your cost to acquire one unit from a manufacturer, wholesaler, or supplier. This is the capital you invest in inventory. Annual ROI is calculated on this number multiplied by your inventory order size, because that represents the total capital you commit per purchase order.
Shipping Cost
What you pay per unit to get inventory from your supplier to Amazon's fulfillment centers. For domestic suppliers this might be $0.50 to $2.00 per unit. For overseas manufacturers, sea freight on large orders can be very cost-effective per unit, while small air shipments are significantly more expensive.
Referral Fee
Amazon's flat fee per unit for your product in your category, entered as a dollar amount. For a $50 product with a 15% referral fee, this would be $7.50.
FBA Fee
Amazon's fulfillment charge per unit — picking, packing, and delivering to the customer. Determined by product dimensions and weight, and is a fixed dollar amount per unit sold.
Units Per Month
Your expected or actual monthly sales velocity. This is the most influential input in the calculator. A product selling 200 units a month generates very different business economics than the same product selling 50 units a month — the same per-unit profit scales to four times the monthly and annual profit, and inventory turns over much faster.
Inventory Units Per Order
How many units you purchase in a single order from your supplier. This determines your total inventory investment per order cycle. A minimum order quantity of 500 units at $20 product cost means $10,000 in capital deployed per order — understanding this alongside monthly sales velocity tells you how frequently that capital is recycling.
Gross income from Amazon sales before any costs — selling price multiplied by units per month. This gives you a sense of the scale of the business at your current or projected sales velocity.
What you actually keep each month after all per-unit costs are deducted. Compare this against your time investment, operational overhead, and any advertising spend not captured in this calculator.
Monthly profit projected across twelve months. Assumes consistent sales velocity — a baseline for evaluating whether the product merits the capital and effort to run it over the long term.
Total capital deployed in a single purchase order — product cost multiplied by inventory units. This is the real financial exposure figure: the amount that leaves your account when you place an order and does not return until those units are sold.
Annual profit divided by inventory investment, expressed as a percentage. The headline metric for comparing product opportunities as capital investments. A 200% annual ROI means you earn back twice your inventory investment in profit over the year.
Net profit on each individual sale after all costs — product, shipping, referral fee, and FBA fee. This is the foundation all scaled outputs are built on. If this number is negative, every other output in the calculator is also negative.
Use realistic selling prices
Enter your target selling price based on what competing products actually sell for, not what you hope to charge. Optimistic assumptions produce optimistic outputs that lead to disappointing real-world results.
Get an actual supplier quote for product cost
Use your real supplier quote including any tooling or packaging costs. For new products without a quote yet, use a conservative estimate and run the calculator at several cost scenarios to understand how sensitive the business is to cost changes.
Research sales velocity before entering units per month
Amazon's Best Seller Rank gives a rough guide. Third-party tools like Jungle Scout and Helium 10 provide estimated monthly sales for any ASIN. Use the lower end of comparable products' ranges to build a conservative case.
Model both minimum and larger order quantities
Use your supplier's minimum order quantity as the baseline, then model a larger order to see how the inventory investment changes and whether the ROI improves meaningfully with more units.
Compare products side by side using annual ROI
Run this calculator for each product opportunity you are evaluating. Annual ROI is the clearest apples-to-apples comparison metric when products have different price points, costs, and sales velocities.
This calculator works with the costs you enter and does not automatically account for Amazon's monthly selling plan fee, storage fees for slow-moving inventory, advertising spend, return processing fees, or income tax on profits. For a complete picture, add your expected monthly advertising cost divided by monthly units to the per-unit costs, and factor in any storage fees for products with slower turn rates.
The annual ROI figure assumes you reinvest in inventory every time a batch sells. If your product sits in the warehouse for months before selling, the actual annual ROI will be lower than the calculator shows because your capital is not turning over at the rate the monthly sales figure implies.
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An Amazon ROI calculator is a tool that helps sellers calculate return on investment by comparing profit to product cost, helping evaluate product profitability before selling.
Amazon ROI is calculated using the formula: ROI = (Profit ÷ Product Cost) × 100. It shows how much return you earn on your investment.
A good ROI for Amazon sellers is typically 50% to 100% or higher, depending on the product category, competition, and business model.
ROI measures profit relative to product cost, while profit margin measures profit relative to selling price. Both are important for evaluating Amazon business performance.
ROI helps Amazon FBA sellers understand how efficiently their investment generates profit, making it easier to compare products and make better sourcing decisions.
Yes, accurate ROI calculation includes all costs such as product cost, shipping, Amazon referral fees, and FBA fulfillment fees.
You can improve Amazon ROI by reducing product cost, optimizing shipping, lowering fees, increasing selling price, or improving conversion rates.
Amazon ROI should include product cost, shipping cost, referral fees, FBA fees, and any additional expenses like advertising and storage.
ROI is often more important than profit because it shows how efficiently your capital is being used, especially when comparing multiple product opportunities.
Yes, you can estimate ROI before selling by using expected costs and selling price, helping you decide whether a product is worth investing in.
* This calculator is for business planning and estimation purposes. Amazon fee structures, FBA rates, and selling plan costs change periodically. Always verify current rates on Amazon Seller Central before making inventory purchasing decisions.