LTV to CAC Ratio Health Grader
Grade your LTV:CAC ratio against efficient-growth benchmarks.
2.74× is under the 3× target. The unit economics work but are thin, improve retention/expansion (LTV) or acquisition efficiency (CAC).
Always grade LTV:CAC on gross-margin LTV and fully-loaded CAC. A too-high ratio isn't always good, it can mean you're growing slower than you could afford to.
About this calculator
LTV:CAC is the ratio investors reach for first because it answers the most basic unit-economics question: for every dollar spent acquiring a customer, how many dollars of margin do you get back? This grader applies gross margin to your LTV input before comparing it to CAC, then bands the resulting ratio so you know whether you're losing money, under-investing, or in the efficient middle.
How to use it
- Enter customer LTV as a revenue figure, total expected revenue from a customer over their lifetime.
- Enter your gross margin percentage, applied to LTV since ratios should always be graded on margin, not raw revenue.
- Enter your fully-loaded CAC.
- Read the gross-margin-adjusted LTV, the LTV:CAC ratio, and a health rating with CAC shown as a percentage of LTV.
Methodology
Gross-margin LTV is revenue LTV times gross margin as a decimal, converting a revenue figure into the actual profit a customer generates. The ratio is gross-margin LTV divided by fully-loaded CAC.
The tool grades the ratio into four bands: under 1x means you're spending more to acquire a customer than they're worth in margin terms, an unsustainable position. 1x to under 3x is below the common efficiency target. 3x to 5x is graded healthy, the classic benchmark range for efficient SaaS growth. Above 5x is flagged "under-investing", a ratio that high often means you could spend more aggressively on acquisition without hurting unit economics.
CAC as a percentage of LTV is shown as a secondary read, CAC divided by gross-margin LTV, the inverse framing of the same relationship, useful for thinking in terms of "what share of a customer's lifetime value did it cost to acquire them."
This is a static ratio based on the LTV, margin, and CAC figures you enter, it doesn't model how LTV itself was derived (churn rate, ARPA, expansion). If your LTV estimate is shaky, run it through the SaaS Churn Cohort Visualizer first to get a more defensible lifespan and LTV figure.
FAQ
Because CAC is a cash cost, and comparing it to raw revenue LTV overstates how much of that revenue is actually available to repay acquisition cost. Applying gross margin converts LTV into the profit figure that's the true, apples-to-apples comparison against CAC.
Not necessarily. This tool flags ratios above 5x as "under-investing" rather than purely excellent, because a ratio that high often means you're leaving growth on the table, you could likely spend more on acquisition and still maintain healthy unit economics, capturing market share instead of banking excess efficiency.
Roughly 3x to 5x, in line with commonly cited SaaS benchmarks. Below 3x, the economics work but leave little room for error or reinvestment; above 5x, the ratio suggests spare capacity to invest more in growth.
LTV:CAC measures total lifetime profit relative to acquisition cost, a question about overall efficiency. CAC payback measures how many months it takes to recover CAC specifically, a question about cash flow timing and capital tie-up. A business can have a strong LTV:CAC ratio and still have a slow, cash-intensive payback period, the two metrics answer different questions and are worth running together.