KarobarKit
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Startup · Local-first · Beta

CAC Calculator

Calculate blended and paid-channel customer acquisition cost from a declared attribution window.

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Tier B · Runs locally in this browser
Method
Blended CAC uses all attributed acquisition cost; paid-channel CAC uses paid-channel spend only, each divided by its matching customer cohort.
Blended CAC = total attributed acquisition cost ÷ all attributable new customers; paid CAC = paid-channel spend ÷ paid-channel customers.
Sources
1 reviewed reference
Open the source register
Effective period
Formula-based; no statutory effective period
Last verified
10 August 2026
Review every 365 days
Reviewer status
Startup metrics reviewer: external review pending
Privacy
Startup inputs and results stay in this browser. They are not sent to analytics, a backend, a URL or a log, and are not saved by default. These outputs are user-entered scenarios, not recommendations or professional valuations.
Important limitations
  • The tool does not infer attribution, channel quality, payback or customer profitability; paid spend must be entered separately.
  • One-off campaign costs and sales costs must be included or excluded deliberately by the user.

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A quick guide

Use the number with context

The answer is only useful when you know what it includes and what it leaves out.

How to use it

  1. Enter sales and marketing cost using the same period and unit as the other inputs.
  2. Enter attribution window in months using the same period and unit as the other inputs.
  3. Enter new customers in the window using the same period and unit as the other inputs.
  4. Enter paid-channel new customers (optional) using the same period and unit as the other inputs.
  5. Enter paid-channel acquisition cost (optional) using the same period and unit as the other inputs.

Formula

Blended CAC = total attributed acquisition cost ÷ all attributable new customers; paid CAC = paid-channel spend ÷ paid-channel customers.

CAC is meaningful only when cost scope, attribution window and customer definition stay consistent.

Make it concrete

Worked example

₹1,00,000 of included cost and 20 attributable customers produces a blended CAC of ₹5,000; ₹60,000 paid spend and 15 paid customers produces paid CAC of ₹4,000.

Boundaries

What this tool does not assume

Limitations

  • The tool does not infer attribution, channel quality, payback or customer profitability; paid spend must be entered separately.
  • One-off campaign costs and sales costs must be included or excluded deliberately by the user.

Edge cases

  • A zero paid-customer denominator omits the paid-only view instead of dividing by zero.
  • Changing the attribution window changes the result.

Last reviewed 10 August 2026 · Formula version 1.0

Method & sources

How this result is grounded

The formula is deterministic and runs in your browser. Read the reference below for the method used by this tool.

  • Startup and SaaS metrics methodology v1

    KarobarKit controlled methodology · authoritative reference · Checked 10 August 2026

    Supports: startup metrics definitions · scenario boundaries · period consistency

Questions

Frequently asked

What is blended CAC?

Blended CAC uses all attributable acquisition cost divided by all attributable new customers.

Can I compare paid CAC with blended CAC?

Yes, when the paid-customer definition and attribution window are documented and comparable.

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Related tools

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Source register checked 10 August 2026.