The SaaS Customer Acquisition Cost Estimator calculates blended CAC by dividing acquisition-related sales and marketing spend by the number of new customers gained during the same period. It also normalizes spend and customer volume to a monthly rate, making it easier to compare periods of different lengths. The result supports channel reviews, budgeting, LTV-to-CAC analysis, and payback planning.
CAC is highly sensitive to what costs are included and when customers are credited. Sales payroll, commissions, media, agencies, tools, and shared marketing costs may all be relevant, but attribution practices differ. Long sales cycles can also shift conversions into a later period than the spending that generated them. Use a documented policy and compare both blended and channel-level CAC when possible.
Include costs assigned to gaining new customers during the period.
Use customers acquired under the same attribution rule.
Enter months so monthly rates can be displayed.
The main result divides total included spend by acquired customers.
Use matching segments and consistent gross-margin assumptions.
Where:
Assumptions: Spend and customer counts are aligned to the same period and attribution policy. Existing-customer success costs, brand investments, and delayed conversions should be treated consistently.
The main result is an estimate based on the values entered and should be interpreted together with the supporting metrics shown.
Use consistent periods and units, and replace planning assumptions with observed data when available.
Given:
Calculation:
CAC = $180,000 ÷ 300 = $600. Monthly spend = $180,000 ÷ 3 = $60,000. Customers per month = 300 ÷ 3 = 100.
Result: Blended CAC is $600 per new customer.
The business is spending an average of $600 to acquire each customer under the selected cost and attribution policy.
Include costs that support acquisition under your policy, such as media, sales payroll, commissions, agencies, and acquisition tools. Apply the policy consistently over time.
Only if your business defines acquisition at trial start. For paid-customer CAC, count customers when they begin paying.
Current-period spend may produce customers in later periods. Use cohort attribution or a rolling period to reduce timing mismatch.
Blended CAC includes all acquisition channels and related costs. Paid CAC usually isolates paid media and customers attributed to those campaigns.
Use the same segment and customer definition. LTV should reflect gross profit, and payback should be checked alongside the ratio.