Amazon true unit economics · Free · No signup

Amazon True Profit Calculator

Model the costs that basic FBA calculators often leave out: inbound shipping, placement, storage, aged inventory, ads, discounts, returns and unrecoverable stock.

Browser-local arithmeticEditable fee assumptionsUSD · GBP · EUR

Amazon seller profit lab

True profit after hidden costs

Use actual statement values where possible. Every fee is editable because Amazon charges vary by marketplace, category, size tier, service usage and time.

Selling price (USD)COGS (USD)Referral fee (%)FBA fulfilment (USD)Inbound shipping / unit (USD)Inbound placement / unit (USD)Storage / unit (USD)Aged-inventory surcharge / unit (USD)Advertising / order (USD)Coupon / discount cost (USD)Other fees / order (USD)Return rate (%)Return processing (USD)Return shipping (USD)Refund admin / retained cost (USD)Returned units unrecoverable (%)

True-profit scenario

$9.19

Estimated net profit per order · 23.0% margin

Referral fee: $6.00
Expected return cost: $0.30
Profit before ads: $13.19
Break-even ACoS: 33.0%

Planning estimate only. It does not reproduce Amazon's fee engine or replace your settlement, inventory, advertising, tax or accounting records.

What this answers

What is left after the fee stack and advertising, not just COGS and referral fees?

How much do expected returns and unrecoverable returned inventory reduce unit margin?

What break-even ACoS remains after the other costs in the scenario?

Recurring pain = paid opportunity

The calculator is free. Rebuilding the model every week should not be.

Solarc Labs is building toward saved SKU models, repeated profit checks, inventory monitoring, alerts and exports. The paid boundary is automation and retained workflow—not access to basic arithmetic.

See current plans All Amazon seller tools

Independent planning tool: Solarc Labs is not affiliated with or endorsed by Amazon. Amazon fees vary by marketplace, category, fulfilment method, dimensions, inventory age, services and policy changes. Replace defaults with your own records. Outputs are estimates and are not tax, customs, accounting, advertising or marketplace-fee advice.