LTV:CAC Ratio

Cross-reference

This metric is defined in Core Metrics. Finance lists it here as a key outcome metric.

LTV:CAC Ratio: The ratio of customer lifetime value to acquisition cost. Measures the return on investment from sales and marketing spend.

Formula

LTV:CAC = LTV / CAC

LTV:CAC-O = LTV-O / CAC-O

LTV:CAC-M = LTV-M / CAC-M

LTV:CAC-O = LTV:CAC-M × (LTV-O / LTV-M) × (CAC-M / CAC-O)

Benchmarks

Below 1:1: Losing money on every customer
1:1 to 2:1: Breaking even or marginal, concerning to investors
3:1 to 4:1: Industry standard, healthy sustainable growth (Median B2B SaaS: 3.2:1)
4:1 to 5:1: Strong business model
Above 5:1: Under-investing in growth; could be growing faster

What It Tells You

Unit economics health. Are customers worth more than they cost to acquire?

Dual-Lens: Operating / Market Forms

Both governed forms are computed from the same Commercial Event Ledger, with Attribution Taxonomy Layer tags deciding which events each form counts.

Operating Form: Contribution LTV:CAC (LTV:CAC-O)

LTV:CAC-O divides Contribution LTV by Fully Loaded CAC. Both sides carry the cost of making a customer productive: the numerator loses the variable service costs over the lifetime and the denominator gains implementation and onboarding.

CEL Source:: `Revenue_Event`, `Cost_Event`
ATL Inclusion:: LTV-O margin costs (`infrastructure`, `support`, `success_engineering`, `implementation`, `onboarding`); CAC-O costs (`gtm`, `implementation`, `onboarding`)

LTV:CAC-O = LTV-O / CAC-O

What it tells you: The return on acquisition spend after every variable cost of acquiring and serving a customer. The ratio to use for pricing, packaging and services investment decisions.

Market Form: Gross Margin LTV:CAC (LTV:CAC-M)

LTV:CAC-M divides Gross Margin LTV by GTM CAC. This is the ratio investors benchmark and the form the 3:1 threshold above assumes.

CEL Source:: `Revenue_Event`, `Cost_Event`
ATL Inclusion:: LTV-M margin costs (`infrastructure` only); CAC-M costs (`gtm` only)

LTV:CAC-M = LTV-M / CAC-M

What it tells you: The investor-comparable unit economics ratio reported to the board and in fundraising materials.

Bridge

LTV:CAC-O = LTV:CAC-M × (LTV-O / LTV-M) × (CAC-M / CAC-O)

The gap between LTV:CAC-M and LTV:CAC-O shows how much of the headline ratio depends on human delivery costs that S&M-based benchmarks leave out. A business at 3:1 on the market form and well under 2:1 on the operating form is buying growth with services effort. Report LTV:CAC-M for comparability and manage to LTV:CAC-O. ---

Connected in the GASP relationship graph.

Upstream: what drives this

CAC component of LTV:CAC Ratio (Core)
LTV component of LTV:CAC Ratio (Core)

Downstream: what this drives

LTV:CAC Ratio measures Customer (Entity)
LTV:CAC Ratio measures Subscription (Entity)

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Sources

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