SSkuMath

Target CPA Calculator

What is the most I can pay for a customer?

Your numbers

Result

Maximum viable CPA
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    How this is calculated

    Target CPA turns your unit economics into a hard ceiling for ad bidding. It accounts for returns and repeat purchase, so it works whether you are judging a single order or a customer relationship.

    1. Contribution per order = average order value × contribution margin %
    2. Net contribution = contribution per order − (return rate × cost per return)
    3. Customer value = net contribution per order × expected orders per customer
    4. Maximum viable CPA = customer value ÷ (1 + required return on ad spend)
    5. Implied minimum ROAS = (order value × orders per customer) ÷ maximum viable CPA

    What to make of the number

    Two ceilings matter and confusing them is expensive. Absolute break-even CPA is where you make nothing. Maximum viable CPA is where you hit your required return — at a 100% required return it is roughly half of break-even. Bid to the second, not the first.

    Frequently asked questions

    What is the difference between break-even CPA and target CPA?
    Break-even CPA leaves you with zero profit — it is the absolute ceiling. Target CPA bakes in the return you require on ad spend, so it is the practical number to bid against. Bidding at break-even means working for nothing.
    Should I optimise for first order or customer value?
    Optimise for first order if cash is tight or repeat purchase is low. Optimise for customer value if you have strong retention and the working capital to wait. The calculator handles both through the expected orders field.
    How do returns change my target?
    Returns cost you the contribution you would have earned plus the cost of handling the return. At a 10% return rate with $7 handling cost, that is roughly $0.70 per order — small per order, but it moves the ceiling by several dollars across a customer's lifetime.
    What if my actual CPA is far below target?
    You are probably leaving volume on the table. Increase bids or budget until CPA approaches the target, and watch that contribution margin holds as you scale into colder audiences.
    How often should I recalculate?
    Whenever price, cost or return rate changes materially, and at minimum quarterly. A CPA target set on last year's margin quietly stops being valid as soon as supplier costs move.

    Do the research before you commit inventory

    SkuMath shows you the math. Helium 10 supplies the live Amazon data those calculations need as inputs — product demand, keyword volume, competitor reviews and profit tracking.

    Try Helium 10 free

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