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Marketing tools

CPA Calculator

You need cost per acquisition from spend and conversions (or actions).

Campaign workspace

CPA Calculator

Structured inputs and readable results — copy URLs, scan limits, and review findings without digging through JSON.

CPA = spend ÷ conversions. Define “conversion” the same way your ads platform does.

Results

Waiting

Results appear here

Fill the form and run the tool — outputs are structured cards, not a raw JSON dump.

Free · API · MCPToolYour platform

Use CPA Calculator three ways

The free CPA Calculator on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the marketing-apis module under Marketing Tools.

  • Free in browserUse CPA Calculator here — no account required.
  • REST APICall from your server with X-Api-Key.
  • MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.
  • 1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
  • 2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
  • 3. Same qualityOutput matches the free web tool across all three surfaces.
Manage API keysMCP setupAPI referenceCreate free account

What is CPA Calculator?

You need cost per acquisition from spend and conversions (or actions). ToolYour CPA Calculator returns CPA = spend / conversions. Definition of “conversion” is yours — the tool does not define events. Same route via REST and MCP (POST /api/v1/marketing-apis/cpa-calculator).

What are common questions about CPA Calculator?

Required fields?

Spend and conversions (or actions); conversions must be > 0.

CPA vs CAC?

CPA is often ad-spend ÷ conversions; CAC usually uses broader sales & marketing cost ÷ new customers. Use CAC Calculator when finance includes salaries/tools.

Is this available via API and MCP?

Yes — same route via REST and MCP on one API key at 1 credit per call.

What are the key features of CPA Calculator?

Clear formula

CPA = spend / conversions for bid targets.

How do you use CPA Calculator?

Enter spend and conversions

Align conversion definition with your CRM/ads.

Set or compare target CPA

Feed into bid caps and channel mix.

Why this tool exists

Setting or checking a target CPA needs a clean spend ÷ conversions calculation, and teams routinely disagree on what 'conversion' means even when the math itself is simple. CPA Calculator handles the math and leaves the definition of a conversion to your own tracking setup.

Problems it solves

Bid caps and channel-mix decisions hinge on CPA, and a shared calculator with a visible formula avoids the classic mistake of dividing conversions by spend instead of spend by conversions when someone is moving fast.

Common use cases

  • Agency channel review: checking CPA per channel before recommending a budget shift to a client.
  • In-house acquisition team: comparing actual CPA against a target cap before adjusting bids.
  • Agent/MCP: an agent computing CPA alongside CAC in a unit-economics summary.
  • QA before spend: stress-testing a projected CPA against budget before a campaign launches.

Honest scope

This is spend ÷ conversions — it does not define what counts as a conversion (that's your tracking setup's job) and conversions must be greater than zero. CPA is typically narrower than CAC (which often includes broader sales & marketing cost); use CAC Calculator when finance wants that fuller picture.

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