CAC Calculator
Calculate Customer Acquisition Cost.
Input & results
Input values
Results
Enter values to see instant results.
Calculation History
- Your calculations will appear here.
Recent calculations are saved automatically as you adjust inputs.
Financial results are estimates for informational purposes only and are not financial, tax, or investment advice. Verify figures with a qualified professional before making decisions. See our full disclaimer.
What is CAC?
The CAC Calculator is a free online tool that helps you calculate customer acquisition cost. It applies the standard cac formula to your inputs and returns results instantly, with no spreadsheets or manual math required.
Built for founders, operators, and finance teams, this calculator turns Sales & Marketing Spend, New Customers Acquired into a clear result you can act on. Every calculation runs privately in your browser, so your figures stay on your device. The page also explains the formula, defines each variable, and walks through a worked example so you understand exactly how the answer is derived.
Why is it used?
People use the CAC Calculator to track growth, efficiency, and runway with confidence. It removes guesswork from startup metrics and SaaS unit economics, lets you compare scenarios in seconds, and helps avoid the rounding and formula errors that creep into manual or spreadsheet calculations.
Who should use it?
This calculator is ideal for founders, operators, and finance teams working through startup metrics and SaaS unit economics. Whether you are planning ahead, double-checking a figure, or learning how cac works, it gives dependable results in seconds.
How it works
- Enter Sales & Marketing Spend, New Customers Acquired in the input fields.
- The calculator validates your entries and applies the correct cac formula.
- Results update in real time as you change any value — no submit button needed.
- Review the formula, variable definitions, and worked example below to see how the answer is derived.
Formula
CAC = Sales & Marketing Spend ÷ New Customers
Variable definitions
| Variable | Meaning |
|---|---|
| spend | Sales & Marketing Spend |
| customers | New Customers Acquired |
How the formula works
- Identify your input values: Sales & Marketing Spend, New Customers Acquired.
- Apply the CAC formula shown above.
- Read the result from the highlighted output panel.
Example calculation
Sample CAC calculation
| Input | Value |
|---|---|
| Sales & Marketing Spend | 100 |
| New Customers Acquired | 100 |
- Enter the sample values shown above into the CAC Calculator.
- Review the live result panel for your exact output.
Result
Methodology
- Gather Sales & Marketing Spend, New Customers Acquired from your documents or estimates.
- Enter each value in the matching field; units must match the labels.
- The calculator applies the CAC formula and updates results in real time.
- Compare scenarios by changing one input at a time.
Benefits
- Instant cac results with no manual calculation.
- Fewer errors than spreadsheets or handheld calculators.
- Compare multiple scenarios in seconds by adjusting inputs.
- Free and private — calculations run on your device, no account needed.
Use cases
- Planning startup metrics and SaaS unit economics before making a decision.
- Double-checking figures from invoices, statements, or spreadsheets.
- Learning how cac is calculated, step by step.
- Comparing options quickly to find the best outcome.
Tips & important notes
- Confirm units match the field labels (e.g. months vs years, % vs decimal).
- Start with realistic baseline values, then adjust one input at a time.
- Cross-check important results with an official source or advisor.
- Use the copy button on results to save outputs for your records.
Common mistakes
- Mixing annual and monthly values (e.g. rate per year vs tenure in months).
- Entering a percentage as a whole number when a decimal is expected, or vice versa.
- Ignoring fees, taxes, or rounding rules that apply on top of the base formula.
Related concepts
- The core cac formula and what each variable means
- Unit conversions relevant to Sales & Marketing Spend, New Customers Acquired
- Related calculators in the startup-saas category on Calcmate.live
Good to know