Free RevOps Tool
CPA Calculator (Cost Per Acquisition)
Cost per acquisition from real results, or forecast from CPC and conversion rate before the campaign has any data to show.
What an Acquisition Really Costs
Two ways in, one number out: the price of the action that actually makes you money.
1. Your campaign
Enter at least one conversion.
Forecast mode: what CPA will be before the campaign has data, from the two numbers you can estimate.
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- Cost per acquisition
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- Acquisitions per $1,000
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- Spend ÷ conversions
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How This Calculator Works
Cost per acquisition is ad spend divided by conversions: $4,000 of spend that produced 50 conversions is an $80 CPA. The only judgment call is what counts as the acquisition, and it should be the money action: the sale, the signup, the booked call, not a click or a pageview. Before a campaign has data, the forecast mode gets you the same number from two estimates you do have: CPA equals cost per click divided by conversion rate, and $4.00 clicks converting at 5% also lands on $80. If the two modes disagree once the campaign is live, the gap tells you which assumption broke.
Keep CPA and CAC straight, because they are cousins, not twins. CPA prices one conversion event from one campaign’s spend. Customer acquisition cost loads in everything it took to win a customer: all channels, tools, salaries, and agency fees across the funnel. CPA steers campaigns week to week; CAC judges the business model. And set your target CPA from your own unit economics rather than an industry average: work backwards from sale value, margin, and close rate, the chain the PPC budget calculator runs, then hand that number to Google Ads as the target CPA bid strategy once the campaign has conversions to learn from. That is the practical loop: unit economics set the target, the bidder chases it, this calculator audits the result.
The formula
| What | The math |
|---|---|
| CPA from results | ad spend ÷ conversions |
| CPA forecast | CPC ÷ conversion rate |
| Acquisitions per $1,000 | 1,000 ÷ CPA |
| Worked example | $4,000 ÷ 50 = $80.00 · $4.00 ÷ 5% = $80.00 |
Keep the Math Going
The rest of the free RevOps toolkit, and the team that runs this math for clients.
Cost Per Lead Calculator
The adjacent metric: price the lead, then the customer.
PPC Budget Calculator
The reverse-funnel math that sets a defensible target CPA.
Ecommerce PPC Management
Campaigns run against unit economics, not vanity metrics.
Frequently Asked Questions
How do I calculate CPA?
Divide ad spend by conversions: $4,000 of spend and 50 conversions is an $80 cost per acquisition. Before a campaign has data, forecast it as cost per click divided by conversion rate, which gives the same $80 from a $4.00 CPC at a 5% rate.
What is the difference between CPA and CAC?
CPA prices one conversion event from one campaign’s media spend. Customer acquisition cost prices the whole customer: every channel, tool, and salary involved in winning them. A campaign can have a healthy CPA while the blended CAC is upside down, which is why CPA runs campaigns and CAC judges the model.
How do I set a target CPA?
From your unit economics, not an industry average: start with sale value, apply gross margin and close rate, and decide how much of the resulting profit you can spend to acquire the action. Then give that number to your bidding strategy and audit against it. An $80 CPA is excellent for a $5,000 sale and ruinous for a $99 one.
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