Verified Mathematical Model & Formulation
Blended CAC = Total Marketing & Sales Spend / Total New Customers Acquired Paid CAC = Direct Ad Spend / Paid Channel Customers LTV:CAC Ratio = Customer Lifetime Value / Blended CAC Payback Period (Months) = Blended CAC / (Average Monthly Gross Margin per Customer)
The definitive venture and bootstrap unit economics benchmark. Healthy businesses maintain an LTV:CAC ratio above 3.0x with payback under 12 months.
Configurable Parameters & Standard Units
- Direct Paid Ad Spend ($ / month): (Default: 15000 usd)
- Software, Agency & Team Overhead ($): (Default: 3000 usd)
- Total New Customers Acquired: (Default: 450 count)
- Estimated Customer Lifetime Value ($ LTV): (Default: 145 usd)
- Avg Monthly Gross Margin per Customer ($): (Default: 28 usd)
Standard Worked Example & Practical Verification
Scenario: $24,000 ad spend + $4,000 software/agency fees, acquiring 650 customers with an average LTV of $160 and $25/mo margin contribution.
Practical Takeaway: Because the ratio exceeds 3.0x and payback is under 2 months, the company can safely scale ad budgets.
Frequently Asked Questions
What is a good LTV to CAC ratio?
A 1:1 ratio is unprofitable. A 3:1 ratio is considered the gold standard for healthy sustainable growth. Ratios above 5:1 often indicate under-investing in acquisition and leaving market share on the table.
What is the difference between Paid CAC and Blended CAC?
Paid CAC divides ad spend by only the customers directly attributed to paid campaigns. Blended CAC divides total marketing expenses by all new customers (including organic, word-of-mouth, and referral).