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Amazon FBA Calculator

Estimate the profitability of an Amazon FBA product from selling price, product costs and Amazon fees. Enter current fees from your seller account for the most accurate estimate — no live fee data is used.

Last reviewed: 2026-07-29

Amazon FBA Calculator inputs

Fill in the fields below, then select Calculate. Nothing is submitted automatically.

The price you charge per unit on Amazon.

Estimated monthly units sold.

Cost to manufacture or purchase the product.

Inbound shipping cost per unit.

Packaging, labeling and preparation.

Amazon referral fee percentage for the category.

FBA pick, pack and ship fee.

Monthly storage cost allocated per unit.

Any additional Amazon fees per unit.

PPC spend allocated per unit sold.

Estimated percentage of revenue lost to returns.

Any remaining per-unit costs.

Changing the currency changes formatting only. It does not convert values between currencies.

Calculations run locally in your browser. Your figures are not sent to a server or stored by us.

Results

Enter your figures above and select Calculate. Results appear here with clear labels — never colour alone.

What is an Amazon FBA calculator?

An Amazon FBA calculator helps sellers estimate the profitability of a product sold through Amazon's Fulfillment by Amazon program. It accounts for all the costs that reduce profit: product cost, inbound shipping, packaging, Amazon referral and fulfillment fees, storage, advertising and return allowances.

The result is a clear picture of profit per unit, total monthly profit, profit margin and ROI on cost of goods sold. This lets you compare products and pricing strategies before committing inventory.

Amazon fees vary by marketplace, category, product size, storage period, and policy changes. Enter current fees from your seller account for a more accurate estimate.

Amazon FBA formulas

  • Gross Revenue = Selling Price × Units Sold
  • Referral Fee per Unit = Selling Price × Referral Fee %
  • Total Cost per Unit = All per-unit costs
  • Profit per Unit = Selling Price − Total Cost per Unit
  • Profit Margin = Profit per Unit ÷ Selling Price × 100
  • ROI = Profit per Unit ÷ COGS × 100
  • Break-Even = Fixed Costs ÷ (1 − Percentage Fee Rate)

Worked example

A product sells for $25, costs $8 to manufacture, $1.50 to ship, $0.50 to package, with 15% referral fee, $3.50 fulfillment, $0.30 storage, $2 advertising and 5% return allowance. 500 units sold monthly.

  • Referral Fee = $25 × 15% = $3.75
  • Return Allowance = $25 × 5% = $1.25
  • Total Cost/Unit = $8 + $1.50 + $0.50 + $3.75 + $3.50 + $0.30 + $2 + $1.25 = $20.80
  • Profit/Unit = $25 − $20.80 = $4.20
  • Monthly Profit = $4.20 × 500 = $2,100
  • Margin = $4.20 ÷ $25 = 16.8%
  • ROI = $4.20 ÷ $10 = 42%

Compare with the profit margin calculator and break-even calculator.

How to use this calculator

Enter your selling price and estimated monthly units. Then fill in all per-unit costs: product cost, shipping, packaging, Amazon fees (referral percentage, fulfillment, storage), advertising and return allowance. The calculator shows profit per unit, total profit, margin, ROI and break-even price.

The break-even selling price accounts for percentage-based fees (referral and returns) as well as fixed per-unit costs. The maximum advertising cost shows how much ad spend per unit you can afford before profit reaches zero.

Interpreting the results

Profit margin shows how much of each sale you keep as profit. ROI measures return relative to the cost of goods (product cost plus shipping and packaging), not total costs. A product with a 16% margin and 42% ROI tells you that costs beyond COGS (fees, ads, returns) consume most of your gross profit.

If profit per unit is negative, the product is selling at a loss at the current price and cost structure. Either raise the price, reduce costs, or reconsider the product.

Common mistakes

  • Underestimating returns. Return rates of 5–15% are common. Include a return allowance.
  • Forgetting storage fees. Long-term storage fees can be significant for slow-moving products.
  • Ignoring advertising. PPC is often essential for visibility. Budget for it per unit.
  • Using outdated fees. Amazon changes fees regularly. Check your seller central account for current rates.
  • Confusing margin with ROI. Margin is relative to selling price; ROI is relative to cost. See the profit margin calculator.

Frequently asked questions

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Disclaimer

Results from this calculator are estimates for general information only and are not financial, accounting, tax, investment or legal advice. Verify important figures with a qualified professional. Read our full disclaimer.