Break-even CPA & Max CPC Builder
Find the most you can pay per acquisition or click and still make money
What-If Scenarios
How your limits change when one variable shifts. Your current inputs are highlighted.
| CR | Break-even CPA | Max CPC | AOV | Break-even CPA | Max CPC |
|---|
What Is Break-even CPA?
Break-even CPA is the maximum amount you can spend to acquire one customer and still cover your costs. Anything above it and you lose money on that order. Anything below it and you have profit to work with.
For e-commerce marketers, this is your ceiling: the number that should live in your ad platform as a target CPA or tCPA bid constraint. Go above it, and every additional conversion actually costs you money.
Break-even CPA
The max cost per acquisition before you start losing money. It accounts for AOV, COGS, and your desired margin.
Max CPC
Break-even CPA multiplied by your conversion rate. This is the most you should bid per click in Google/Meta Ads.
LTV Multiplier
When customers come back, you can afford to pay more upfront. Repeat purchases increase the effective revenue per customer.
The Formulas
CPA = AOV × (1 − COGS% − Target Margin%) × LTV Multiplier
Max CPC = Break-even CPA × Conversion Rate
LTV = 1 + (Repeat Rate × Avg. Repeat Orders)
The LTV multiplier is a simplified model. For a more precise estimate, factor in repeat-order margin differences, time-to-repeat discounting, and churn over time.
Industry Benchmarks
| Vertical | Avg. AOV | Typical COGS | Typical CPA (Google) | Avg. CR |
|---|---|---|---|---|
Fashion / Apparel |
$60-120 | 40-55% | $30-60 | 1.5-3% |
Health / Beauty |
$40-80 | 25-40% | $20-50 | 2-4% |
Electronics |
$150-500 | 50-70% | $40-100 | 1-2.5% |
Home / Garden |
$80-200 | 35-50% | $25-70 | 1.5-3% |
Supplements / DTC |
$35-60 | 15-30% | $25-55 | 2-5% |
Best Practices
- Include ALL variable costs in COGS (shipping, packaging, payment fees)
- Recalculate monthly as AOV and CR shift seasonally
- Factor in repeat purchases for subscription/DTC brands
- Set your ad platform CPA target 10-20% below break-even for a safety buffer
- Use Max CPC as a bid ceiling, not your actual bid
- Forget payment processing fees (2-3% of revenue)
- Use gross revenue when you should use net (after returns)
- Assume LTV without data; start with first-order economics
- Ignore channel differences: Google Search vs. Meta vs. TikTok have different CPCs
- Set Max CPC as your only bid strategy; use it as a guardrail
Frequently Asked Questions
Start with first-order break-even to make sure you’re profitable on day one. Only switch to LTV-based targets when you have at least 6 months of cohort data confirming repeat purchase patterns. Many brands overestimate LTV and end up burning cash.
Not necessarily. First, check if you’re tracking all conversions (assisted, post-view, cross-device). Then check your attribution window. If CPA is 10-20% over, you might still be profitable when accounting for organic lift and brand effects. If it’s 50%+ over, you likely need to improve either the offer, the landing page, or the targeting.
Returns reduce your effective AOV. If you have a 15% return rate, multiply your AOV by 0.85 before entering it into the calculator. For fashion (20-30% returns), this can dramatically lower your break-even CPA.
It depends on your growth stage. Early-stage brands often target 0-10% to maximize volume and customer acquisition. Mature brands target 15-25%. Set margin to 0% to find your absolute break-even, then decide how much profit buffer you need.
Use blended averages (weighted by revenue share) for a quick estimate. For precision, calculate break-even CPA per product category and set different CPA targets in your ad campaigns accordingly. High-margin products can support higher CPAs.
Yes. Replace AOV with your average deal value, COGS with fulfillment/service delivery cost, and CR with your lead-to-sale conversion rate. The math is the same: revenue minus costs, divided down to a per-acquisition ceiling.