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Amazon Seller Calculators
SellerFormulas helps Amazon sellers read advertising performance and model FBA fees, product profit, and marketplace economics with transparent formulas and clearly stated assumptions.
Available calculators
Amazon FBA Calculator
Estimate 2026 US referral, fulfillment, surcharge, selling-plan, and optional allocated Amazon fees with visible size and weight assumptions.
Amazon ACoS Calculator
Calculate ACoS, ROAS, ad spend per $100 of attributed sales, and optional target and break-even comparisons.
Amazon Break-Even ACoS Calculator
Calculate contribution margin, break-even ACoS and ROAS, maximum ad spend, and an optional Current ACoS comparison.
Amazon Profit Calculator
Combine the FBA fee engine with product cost, inbound freight, packaging, advertising, and seller expenses to estimate product-level profit.
Amazon tools now live
The initial Amazon calculator set now covers core FBA fees, advertising efficiency, break-even advertising thresholds, and product-level profit.
- Amazon FBA Calculator
- Amazon ACoS Calculator
- Amazon Break-Even ACoS Calculator
- Amazon Profit Calculator
Amazon economics covered
Live tools now cover core FBA fee estimation, campaign efficiency, and product-level advertising thresholds.
- Advertising cost of sales and return on ad spend
- Target ACoS and seller-provided break-even comparisons
- Referral and FBA fulfillment estimates with transparent classification
- COGS, inbound freight, advertising, and product-profit modeling