Find your most profitable cost per sale
Breakeven max CPA, breakeven & target ROAS, and max cost-per-lead — straight from your margin and AOV.
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Treat the highlighted breakeven max CPA as a hard ceiling. Bid at your target CPA so every sale still funds returns, attribution gaps, and profit.
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Max CPA & Target ROAS Calculator (2026)
Your max CPA is the most you can pay to acquire a customer before the sale stops being profitable. It equals your average order value times your gross margin. Enter your numbers below to get your breakeven max CPA, breakeven ROAS, a profit-protected target CPA and ROAS, and — if you sell to leads — your max cost-per-lead.
What is max (target) CPA?
Max CPA — short for maximum cost per acquisition — is the highest amount you can spend to win one customer without losing money on the order. At breakeven it equals your gross profit per order: average order value multiplied by your gross margin. A $80 order at a 60% margin gives $48 of gross profit, so your breakeven max CPA is $48.
Target CPA sits below that ceiling. It's the most you can pay and still keep a chosen profit margin: AOV × (gross margin % − desired profit %). Subtract a 20% target profit from that same $80 order and your target CPA drops to $32 — the number you should actually bid to, leaving the $48 breakeven as a line you never cross.
Max CPA vs breakeven ROAS
Max CPA and breakeven ROAS measure the same break-even point from two angles. Max CPA is stated in dollars per acquisition; breakeven ROAS is stated as revenue per dollar of ad spend, and equals 1 ÷ your gross margin. A 50% margin means a 2.00× breakeven ROAS, which is the same as saying you can spend up to half of each order acquiring it.
| Gross margin | Breakeven ROAS | Max CPA (on a $80 order) |
|---|---|---|
| 30% | 3.33× | $24 |
| 50% | 2.00× | $40 |
| 60% | 1.67× | $48 |
| 75% | 1.33× | $60 |
Use max CPA when your bidding or budgeting works per conversion, and target ROAS when you set value-based bids. If your conversion event is a lead rather than a sale, multiply your breakeven max CPA by your lead-to-sale close rate to get your max cost-per-lead — the most you can pay for a lead that, on average, still pays back.
Want to work the ROAS side instead? The breakeven ROAS calculator starts from the same margin, and the ad metrics calculator turns spend, clicks and conversions into your real CPA so you can compare it against the ceiling above. See the rest of the free paid-ads tools for the full set.
Frequently asked questions
What is max (target) CPA?+
Your max CPA is the most you can pay to acquire one customer before the sale stops being profitable. Your breakeven max CPA equals your gross profit per order — average order value × gross margin. Your target CPA is lower than that: it's what you can pay and still keep a chosen profit margin, calculated as AOV × (gross margin % − desired profit %).
How do you calculate max CPA from margin?+
Multiply your average order value by your gross margin percentage. A $80 order at 60% margin gives $48 of gross profit, so your breakeven max CPA is $48 — spend more than that to win the order and you lose money. To leave room for profit, subtract your desired profit margin first: at a 20% target profit, max CPA = $80 × (60% − 20%) = $32.
What's the difference between max CPA and breakeven ROAS?+
They're two views of the same break-even point. Max CPA is expressed in dollars per acquisition; breakeven ROAS is expressed as revenue per dollar of ad spend. Breakeven ROAS = 1 ÷ gross margin, so a 50% margin needs a 2.00× ROAS and lets you spend up to half of each order on acquisition. Use max CPA when you bid or budget per conversion, and ROAS when you set value-based bidding targets.
Where does close rate (max cost-per-lead) come in?+
If your conversion is a lead rather than a sale, not every lead becomes a customer. Multiply your breakeven max CPA by your lead-to-sale close rate to get the most you can pay per lead. At a $48 breakeven max CPA and a 25% close rate, your max cost-per-lead is $12 — beyond that you're paying for leads that never pay back.
Should I bid at my max CPA?+
No — max CPA is the ceiling, not the target. Bidding at breakeven leaves nothing for returns, attribution error, or profit. Use your target CPA (the one that bakes in a desired profit margin) as the bid, and treat the breakeven max CPA as the hard line you never cross.
