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Amazon FBA Calculator

Know your true FBA profit, margin, and break-even ACoS in seconds.

Your numbers

Enter your costs — results update instantly.

$
$
%

Amazon category fee (often 15%)

$

Fulfillment per unit

$
$

Prep, storage, returns

$
Net profit / unit
$9.54
Profitable
Margin
31.8%
ROI
126.4%
Break-even ACoS
41.8%
Max ad spend before loss
ROAS
10.00×
ACoS 10.0%
Amazon fees
$9.90
Referral $4.50 + FBA
Monthly profit
$2,862.45
300 units

See FBA profit on every ASIN

Connect Seller Central and the Captain calculates real per-product profit after fees, ads and returns.

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How it’s calculated

Net profit / unit = Sale price − Product cost − Referral fee − FBA fee − other costs

Margin = Net profit ÷ Sale price × 100.

Worked example

Sale price
$29.99
Product cost
$6.00
Referral fee (~15%)
$4.50
FBA fulfilment fee
$5.50
Result
Net ≈ $13.99 per unit (~47% margin)

Illustrative — verify current Amazon fee rates for your category and size tier.

What your result means

This shows what you actually keep on an Amazon sale after Amazon's cut. Referral fees (commonly ~15%) and FBA fulfilment fees can swallow a third or more of the price, so a healthy retail margin can turn thin on Amazon. Check every SKU — fulfilment fees scale with size and weight.

Common mistakes

  • Forgetting FBA storage (and long-term storage) fees for slow-moving stock.
  • Using an out-of-date referral percentage — it varies by category.
  • Ignoring returns and PPC, which come out of the same margin.

Learn how it works

5 min guide
Amazon FBA Fees Explained (and How to Calculate FBA Profit)

Amazon's referral and FBA fulfilment fees can swallow a third or more of your sale price. Learn what each fee is, how to calculate your true FBA profit per unit, and why your Amazon margin is thinner than your website's.

Related Amazon Sellers tools

Amazon TACoS Calculator

See ad spend as a share of your total Amazon revenue — TACoS and ACoS together.

Amazon Sales Pulse

Live revenue, orders, and units from your Amazon account.

Revenue Trend

Your daily Amazon revenue as a live area chart.

Traffic Sources

Where your Amazon sales come from — as a live donut.

Frequently asked questions

What fees does Amazon charge FBA sellers?

Mainly a referral fee (a percentage of the sale price, ~15% in most categories) and an FBA fulfilment fee (based on size and weight), plus storage fees. Always verify current rates in Amazon's fee schedule.

Why is my Amazon margin lower than my website margin?

Amazon's referral and FBA fees typically take 25–40% of the sale price — costs your own store doesn't charge.

Last reviewed 31 Jul 2026 · reviewed by the Dash Captain team.