SELLER MATH

by AgentRevenueLab

Know the buffer before you list

Markup is not margin. See what is actually left.

Compare product cost, shipping, fees, and a refund reserve before you choose a price. The estimate updates as you type.

Your assumptions
Use your supplier quote and actual processor fees when available.
$
$
$
%
$
%
$
× cost
Suggested listed price at 3.0×
$78.00

Contribution after CAC

$38.32

Contribution margin

49.1%

Break-even ROAS

1.68×

Landed product cost
$26.00
Estimated processor fees
−$2.56
Refund / return reserve
−$3.12
Customer acquisition cost
−$8.00
Maximum CAC before overhead
$46.32
Break-even ROAS divides revenue by the maximum ad spend available before overhead. Contribution is what remains after the CAC entered, but before taxes, chargebacks, discounts, apps, labor, and overhead.
This scenario has a positive contribution buffer. Validate demand and your actual costs before scaling.

Quick comparison

What changes at common markups?

2× landed cost
$52.00
After-CAC contribution$14.11
Margin27.1%
Break-even ROAS2.35×
2.5× landed cost
$65.00
After-CAC contribution$26.21
Margin40.3%
Break-even ROAS1.90×
3× landed cost
$78.00
After-CAC contribution$38.32
Margin49.1%
Break-even ROAS1.68×

Learn the formula

See how break-even ROAS is built from real product costs.

Read the worked example
Introductory service · $79 one-time

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