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fin.biz-cac Calculator
Calculates Customer Acquisition Cost (CAC), LTV:CAC ratio, and CAC payback period from sales and marketing spend and new customer count. An LTV:CAC ratio below 3:1 is a warning sign for SaaS businesses; payback period above 18 months strains cash flow.
Inputs
Spend
Reference formula or conversion factor shown for context.
Customers
Reference formula or conversion factor shown for context.
Ltv
Reference formula or conversion factor shown for context.
Results
CAC
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
LTV:CAC ratio
The proportional relationship between two quantities.
CAC payback
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.