Inputs used
- Average gross revenue per customer
- Gross margin percentage
- Lead-to-customer close rate
- Landing-page conversion rate
- Currency symbol
Free Google Ads tool / Unit economics
Google Ads break-even CPA and ROAS calculator
This tool translates gross revenue, margin, lead close rate and landing-page conversion into break-even acquisition thresholds. It helps frame budget decisions but does not include every operating cost or attribution limitation.
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Interactive tool
Change the assumptions. Compare the scenario.
Enter non-sensitive planning values. The output updates in your browser and is not sent to GrowthLabs.
- Break-even ROAS
- 2.5×
- Maximum customer CPA
- $200
- Maximum lead CPL
- $40
- Maximum CPC at stated page rate
- $8
Mathematical break-even before overhead, desired profit and attribution uncertainty.
Formula and inputs
Know what the result actually represents.
Break-even ROAS = 1 ÷ gross-margin rate. Maximum customer CPA = customer revenue × gross-margin rate. Maximum CPL = maximum customer CPA × lead close rate. Maximum CPC = maximum customer CPA × page conversion rate.
Important cautions
- +Include refunds, fulfilment, sales and variable costs when they materially affect contribution.
- +Lead CPL only makes sense when close-rate definitions are reliable.
- +Platform attribution may count conversions differently from finance or CRM systems.
- +A campaign normally needs headroom below break-even to fund overhead and profit.
How to use the output
Move from arithmetic to a better decision.
- 01
Start with customer economics
Use a representative customer value and the margin remaining after direct costs.
- 02
Define the funnel
State whether the campaign produces purchases or leads and use a consistent lead-to-customer rate.
- 03
Set a working target
Choose a target below the mathematical break-even CPA to allow for overhead, uncertainty and profit.
- 04
Reconcile quality
Compare platform conversions with qualified leads, sales, refunds and margin before scaling.
Tool questions
Definitions and limits, answered.
01What is break-even ROAS?
It is the revenue-to-ad-spend ratio at which gross profit equals advertising cost under the stated margin assumptions. It is not automatically the business's profitable target.
02What is maximum CPA?
It is the most the model can spend to acquire the defined customer before the included gross profit is consumed. Overhead and desired profit usually require a lower working CPA.
03How is maximum CPC calculated?
The simplified model multiplies maximum customer CPA by the landing-page conversion rate. Real bidding decisions also depend on query quality, delays, attribution and auction conditions.
04Can I use this for lead generation?
Yes. The maximum lead CPL multiplies customer CPA by the expected lead-to-customer close rate. Use qualified and consistently defined leads.
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