SaaS CAC Payback Calculator
Estimate how long it takes to recover customer acquisition cost from gross profit. Use it to frame questions, not to replace a full unit-economics model.
YOUR INPUTS
Enter fully-loaded acquisition spend and new customers for the same period. This simple model does not include churn, expansion, sales compensation, or cash-flow timing.
Read the result carefully
A payback number is only as good as the inputs.
Use blended or channel-specific spend consistently. Include the acquisition costs that the decision actually needs to account for.
This calculator uses average monthly revenue and gross margin. It does not model churn, expansion, payment terms, sales-cycle delay, or cash collection.
Compare scenarios, state the assumptions, and investigate the constraint behind the number before reallocating budget.
Discuss the model
Model the conversation
A calculation is only as useful as its assumptions.
Use the inputs to make trade-offs explicit, then connect the output to the evidence and operating conditions behind it.