Connect CPC and conversion rate to the profit that remains after product, fulfillment and payment costs—not just top-line ROAS.
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01
Enter your business assumptions
Start with the essential numbers. Open advanced assumptions only when they apply.
Advanced assumptions
Optional inputs refine the estimate but are not required to understand the first result.
DECISION GUIDE
How to use this result in a real decision.
Can this campaign acquire a customer without consuming the order's contribution profit? Compare current CPA with contribution before advertising—not revenue alone. A positive platform ROAS can still lose money when product, fulfillment, payment and return costs are omitted.
WORKED EXAMPLE
$80 order with a 2.5% conversion rate
Inputs
$80 average order value, $36 non-ad cost, 3% fees, $0.80 CPC and $3,000 monthly spend.
Calculated result
Contribution before ads is $41.60. A 2.5% conversion rate turns $0.80 CPC into a $32 CPA, leaving $9.60 on the first order before overhead and tax.
Decision meaning
The campaign is above break-even, but the cushion is modest. A drop to roughly 1.9% conversion would consume the contribution profit at the same CPC.
Check before acting
Use blended conversion rate only when traffic quality is comparable; otherwise calculate by campaign or landing page.
Separate first-order profit from verified repeat-purchase profit. Do not use revenue as customer lifetime value.
Test a target CPC that preserves profit, not merely the maximum break-even CPC.
Not included automatically
Agency fees, creative production and attribution-tool costs
Taxes, refunds beyond the entered reserve and chargebacks
Incrementality: the calculator assumes attributed orders were caused by the ads
How to use it
A better decision in three steps.
01
Use contribution after every non-ad cost, not revenue alone.
02
Enter a realistic conversion rate and CPC from the same traffic segment.
03
Compare break-even with your target margin before changing a bid or budget.