Use margin, FBA, and eBay tools for unit economics and pricing. ROAS, CPC, and CPM distinguish revenue, clicks, and impressions. Break-even connects unit contribution to fixed costs, while the affiliate calculator models commissions separately from profit.
Compare consistent assumptions
Use one currency and a consistent period. Do not mix tax-exclusive and tax-inclusive values in profit calculations. Tools check inputs and mathematical limits, not tax liability, contracts, or actual account data.
Frequently asked questions
Is revenue the same as profit?
No. Profit requires deducting relevant costs. A high ROAS alone does not prove a profitable campaign.
How do margin and markup differ?
Margin compares profit with selling price; markup compares it with cost. The calculator keeps both measures separate.
Do the FBA and eBay calculators access my accounts?
No. You enter fees and assumptions yourself. Verify current terms with the platform.
How do I keep tax-exclusive and tax-inclusive amounts consistent?
Use one consistent basis and specify the tax rate. The VAT calculator does not replace a tax assessment.
Can break-even calculations predict future sales?
No. It shows the required volume under your assumptions, not a forecast of demand or actual sales.