INTELLIGENCE
LTV:CAC Ratio — calculated correctly.
The gold standard for acquisition efficiency, available at customer level and portfolio level — with gross margin adjustment and fully-loaded CAC. Below 3:1 means acquisition is too expensive. Above 5:1 may mean you are underinvesting in growth. Most tools either skip it or get the components wrong.
The estimated total revenue a customer will generate over their lifetime — and how many times that exceeds the cost to acquire them.
Why LTV:CAC matters more than any other acquisition metric
Most acquisition metrics look at one side of the equation. Cost per lead. Cost per acquisition. Conversion rate. They tell you how much you are spending and how many customers you are getting. They do not tell you whether the customers are worth what you spent on them.
LTV:CAC closes the loop. It compares the total value a customer will generate over their lifetime against the total cost of acquiring them. A ratio of 3:1 means you earn three dollars for every dollar spent on acquisition. Below 3:1, acquisition is too expensive. Above 5:1, you may be underinvesting in growth — leaving money on the table by not acquiring customers you could profitably serve.
The trap most tools fall into is calculating this badly. They use revenue instead of gross profit (which inflates LTV by ignoring the cost of serving the customer). They count only direct ad spend instead of fully-loaded acquisition cost (which deflates CAC and makes the ratio look better than it is). The result: a number that feels precise but is wrong by a factor of two or more.
How Incremenza calculates LTV:CAC correctly
Projected LTV
Current MRR × Expected Lifetime in Months × Gross Margin %
- Current MRR — Pulled directly from your billing system (Stripe, Square, or PayPal). Updated continuously.
- Expected Lifetime — 1 ÷ Monthly Churn Rate. If your monthly churn is 3%, expected lifetime is ~33 months. If churn data is unavailable or zero, defaults to 36 months (a conservative SaaS standard).
- Gross Margin % — Calculated per customer from revenue transactions minus COGS-category expenses. COGS includes hosting, payment processing, direct labour, and third-party services attributable to that customer.
CAC (fully loaded)
(Total Sales + Marketing Costs + Onboarding Costs) ÷ Customers Acquired
- Marketing Costs — All marketing spend across channels, synced from ad platforms via Zapier where available.
- Sales Costs — Sales team salaries, commissions, and tooling.
- Onboarding Costs — Allocated implementation and customer success time during the onboarding window.
- Customers Acquired — New paying customers in the period.
The ratio at two levels
- Customer-level LTV:CAC — Individual customer's projected LTV divided by their attributed acquisition cost. Useful for prioritization and account-level decisions.
- Portfolio-level LTV:CAC — Average projected LTV across all active customers divided by company fully-loaded CAC. Useful for board reporting and strategic decisions.
CAC Payback Months
Customer CAC ÷ (Customer Monthly MRR × Gross Margin %)
The companion metric. Tells you how many months until you have recouped what you spent to acquire a customer. Most healthy businesses target under 12 months.
Four things to verify when any tool claims to calculate LTV:CAC
1. Is gross margin in the LTV calculation?
If LTV is calculated as MRR × Lifetime without a gross margin multiplier, it is wrong — you are counting revenue you do not actually keep. The correct formula adjusts LTV down by your cost of serving the customer.
2. Is CAC fully loaded?
If CAC is just ad spend ÷ customers, it is wrong — it ignores sales team costs, onboarding costs, and tooling. Real CAC includes everything required to acquire and onboard a customer. Most tools calculate "blended CAC" using only ad spend; that is a partial view at best.
3. Are LTV and CAC in the same time frame?
LTV is forward-looking (lifetime value of customers acquired now). CAC is backward-looking (what we spent to acquire them). Calculating LTV from historical cohort data and dividing by current CAC mismatches time frames and produces a number that has no real meaning.
4. Is the calculation available at customer level, not just company level?
Company-wide LTV:CAC is useful for boards but useless for prioritization. The high-leverage move is knowing which individual customers have a great ratio (worth investing in retention) versus which are upside-down (where additional spend is bad money). Few tools support customer-level calculations.
Where you see LTV:CAC inside Incremenza
- Customer Detail page — Full LTV:CAC breakdown per customer, including all sub-metrics (MRR, Expected Lifetime, Gross Margin, CAC, Payback Months).
- Customer Dashboard — Portfolio-level LTV:CAC ratio in the retention metrics row.
- Cohort Analysis — LTV:CAC per cohort to surface acquisition quality trends over time.
- Channel Comparison — LTV:CAC per acquisition channel — which channels deliver the most efficient customers.
- Quarterly Reset — Surfaced as a metric to score during the quarterly review.
- Weekly Briefing — Flagged automatically when the ratio crosses a threshold (below 3:1 or above 5:1).
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Frequently asked questions
LTV:CAC works for any business with a customer acquisition cost and a customer relationship over time. For service businesses, LTV is the projected revenue a client will generate over the duration of the relationship — calculated from average engagement length and recurring service patterns. For product businesses with repeat customers, LTV uses purchase frequency and customer lifetime. The principle (cost to acquire vs. value delivered) is universal; only the calculation inputs change.
LTV:CAC is included in the Momentum and Command plans. The Clarity plan includes basic CAC tracking and customer revenue, but not the projected LTV calculation that requires the customer success module.
Customer-level LTV is cached for one hour to balance freshness with performance. Portfolio-level LTV:CAC updates within minutes of new transactions, billing changes, or customer additions.
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LTV:CAC RATIO
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