Calculator Servicescalculatorservices.com
Financial

Customer Acquisition Cost (CAC)

Marketing spend ÷ new customers. Free online Customer Acquisition Cost (CAC) for financial — instant, accurate results, mobile-friendly, no signup needed.

CAC
$100.00

Derivation

  1. ├── 01Givenspend = 10000, cust = 100
  2. ├── 02Formulae.spend / e.cust
  3. ├── 03Substitutee.10000 / e.100
  4. └── 04Compute CAC$100.00
Did you know?

Every calculator here runs 100% in your browser — nothing is sent to a server or stored in a database.

§01What is

Understanding the Customer Acquisition Cost (CAC)

The Customer Acquisition Cost (CAC) computes CAC from 2 inputs: marketing spend ($), new customers. Marketing spend ÷ new customers.

Quick calculators for the math that shouldn’t need a notepad — instant, accurate, private to your browser. The Customer Acquisition Cost (CAC) sits in that toolkit — it marketing spend ÷ new customers. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

e.spend / e.cust

Where

spend
Marketing spend ($)
cust
New customers
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Marketing spend ($) = 10000, New customers = 100.

  1. 01Start by noting the input — Marketing spend ($): 10000.
  2. 02Start by noting the input — New customers: 100.
  3. 03Substitute these values into the formula: e.spend / e.cust
  4. 04Compute CAC: the calculator returns 100.
  5. 05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common Customer Acquisition Cost (CAC) Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Marketing spend ($) halved

spend = 5000 (from 10000)

Keep every other input at its default and halve the marketing spend ($). See how cac responds.

  1. 01New Marketing spend ($): 5000
  2. 02Baseline CAC: 100
  3. 03New CAC: 50
  4. 04CAC decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Marketing spend ($) doubled

spend = 20000 (from 10000)

Keep every other input at its default and double the marketing spend ($). See how cac responds.

  1. 01New Marketing spend ($): 20000
  2. 02Baseline CAC: 100
  3. 03New CAC: 200
  4. 04CAC increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

New customers halved

cust = 50 (from 100)

Keep every other input at its default and halve the new customers. See how cac responds.

  1. 01New New customers: 50
  2. 02Baseline CAC: 100
  3. 03New CAC: 200
  4. 04CAC increases by 100% → use this sensitivity to plan for real-world variation.
04 · PATTERN

New customers doubled

cust = 200 (from 100)

Keep every other input at its default and double the new customers. See how cac responds.

  1. 01New New customers: 200
  2. 02Baseline CAC: 100
  3. 03New CAC: 50
  4. 04CAC decreases by 50% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
Your feedback

How useful was this calculator?

Your ratings stay in your browser — they help us learn which tools people actually rely on.

Rate it
Was this helpful?