Business
Amazon FBA Profit Calculator
Reconcile monthly FBA sales from units and average selling price through refunds and every entered cost layer, then calculate contribution per completed unit, net margin, and the volume required to cover fixed overhead.
Gross sales or billed value-
Refunds, cancellations, or nonpayment-
Net realized sales-
Direct delivery cost-
Platform, referral, or marketplace fees-
Payment and additional percentage fees-
Fixed per-transaction fees-
Contribution before fixed overhead-
Estimated profit after overhead-
Profit margin on net sales-
Contribution per completed unit-
Units needed to cover fixed overhead-
Decision view
Amazon FBA Profit economics
Amazon FBA Profit economicsGross sales are reduced by refunds, delivery costs, platform fees, payment fees, transaction fees, and overhead to reach estimated profit.
Exact scenario comparisonUnits sold per month changes while all other entered assumptions remain constant.
| Units sold per month | Gross sales or billed value | Refunds, cancellations, or nonpayment | Net realized sales | Direct delivery cost | Platform, referral, or marketplace fees | Payment and additional percentage fees | Fixed per-transaction fees | Contribution before fixed overhead | Estimated profit after overhead | Profit margin on net sales | Contribution per completed unit | Units needed to cover fixed overhead |
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How to use Amazon FBA Profit Calculator
- Use one SKU or a genuinely comparable product group with a consistent selling price and cost structure.
- Enter landed product, inbound freight, fulfillment, and expected storage in direct unit cost without duplicating fees entered elsewhere.
- Reconcile the result with settlement reports, returns, reimbursements, advertising, inventory aging, and cash tied up in stock.
Calculator guide
Understanding Amazon FBA Profit Calculator
Amazon FBA profit is the amount remaining after refunds, landed product cost, fulfillment and storage, referral fees, other marketplace charges, per-unit fees, and fixed operating overhead—not gross sales.
Calculation method
How the calculation works
Model Amazon FBA profit by reconciling unit sales with product and inbound cost, referral fees, fulfillment charges, storage expense, other marketplace fees, advertising, and overhead. Subtract modeled refunds from gross sales, deduct landed and fulfillment cost for entered units, apply percentage and fixed marketplace fees, then subtract monthly overhead from contribution.
FBA reconciliation
Trace one unit from supplier to settlement
Every entered cost should have one clear source and should appear only once.
Worked situations
Practical examples
- A $42 sale with $18 direct cost is not a $24 profit because referral, payment, fixed, refund, and overhead layers remain.
- Refund rate reduces realized sales while some fulfillment and product costs may still be incurred.
- Break-even volume rises when contribution per completed unit falls or monthly overhead increases.
Better inputs
Useful tips
- Use realized average selling price after coupons and promotions.
- Allocate monthly advertising and software consistently across SKUs.
- Run separate cases for peak storage, aged inventory, and fee-schedule changes.
Before relying on the result
Limitations and common mistakes
- The model simplifies Amazon fee schedules that vary by category, size tier, weight, storage season, country, and program.
- Removal orders, reimbursements, inventory loss, VAT or sales tax, financing, cash conversion, and restocking are excluded.
- Break-even volume assumes entered price and unit economics remain constant.
Reference
Key terms
- Net realized sales
- Gross sales less modeled refunds, cancellations, or nonpayment.
- Direct unit cost
- Entered product, inbound, fulfillment, and storage cost per sold unit.
- Contribution per unit
- Revenue remaining per completed unit before fixed monthly overhead.
- Break-even volume
- Whole units required for contribution to cover entered fixed overhead.
Important note
Calculated from the entered values using the displayed accounting method. Reconcile material decisions with source records and applicable accounting policy.
Frequently asked questions
Should advertising be entered per unit or as overhead?
Use one method consistently. Monthly advertising commonly belongs in overhead unless a reliable per-unit acquisition cost is available.
Does direct unit cost include referral fees?
No when referral fees are entered in the percentage-fee field.
Why can profit be negative with positive contribution?
Monthly fixed overhead can exceed total unit contribution.
Does break-even include inventory purchases?
It includes entered unit product cost but does not model the timing of inventory cash payments.