A free LTV CAC ratio calculator that divides customer lifetime value by acquisition cost to show whether your growth motion is efficient. The single clearest signal of whether each customer is worth what you pay to win them.
This calculator runs entirely in your browser. Nothing you enter is sent anywhere or stored. It is a quick estimate, not financial advice.
The LTV to CAC ratio is the cleanest single read on SaaS growth efficiency. It answers one question: is a customer worth more than they cost to win and by how much? This calculator gives you the ratio instantly but the interpretation matters more than the number, because both too low and too high carry a warning.
Most people know that a low ratio is bad. Fewer realise that a very high ratio is also a signal, of underinvestment. A ratio of 8 to 1 looks great until you realise you could be spending far more on acquisition and still growing profitably, which means you are leaving growth on the table. The healthy zone is roughly 3 to 5 to 1.
Use margin-adjusted lifetime value, not revenue-based. If you have not got it, the LTV calculator gives you the figure in seconds.
Use CAC that includes salaries, tools and overhead, not just media spend. A flattering CAC produces a flattering, useless ratio.
Divide LTV by CAC. Under 3 to 1, lift LTV through retention. Over 5 to 1, consider spending more to grow faster. 3 to 5 is the sweet spot.
The LTV to CAC ratio divides customer lifetime value by customer acquisition cost to show whether a customer is worth more than they cost to win. It is the clearest single measure of SaaS growth efficiency. A ratio of 3 to 1 means each customer is worth three times their acquisition cost, which is the common healthy benchmark. The ratio is more useful than either number alone because it ties value directly to cost.
Roughly 3 to 5 to 1 is the healthy zone for SaaS. Below 1 to 1 you lose money on every customer and the model does not work. Between 1 and 3 you are profitable but tight. Above 5 to 1 the economics are strong but often signal underinvestment in growth, meaning you could spend more on acquisition and still grow profitably. The sweet spot balances efficiency with growth.
Because it usually means you are underinvesting in growth. A ratio of 8 or 10 to 1 shows excellent unit economics but it also suggests you could spend considerably more acquiring customers and still come out ahead. In a competitive SaaS market, sitting on a very high ratio often means a faster-growing competitor is capturing the customers you could have won. Strong economics are an invitation to invest, not just to celebrate.
Two levers: raise LTV or lower CAC. Raising LTV usually comes from reducing churn and driving expansion revenue, which compounds because it lifts the value of every customer. Lowering CAC comes from more efficient channels, better conversion and stronger positioning. For most SaaS with a tight ratio, the retention lever beats the acquisition lever, because churn improvements flow straight into LTV.
Quarterly is sensible for most SaaS, with a closer watch if you are scaling acquisition spend fast or seeing churn move. The ratio shifts as your channels mature, your pricing evolves and your retention changes, so a number from a year ago tells you little about today. Track it as a trend rather than a one-off, because the direction matters as much as the absolute figure.
If your CAC, churn or payback is not where you want it, that is a marketing problem we fix. Book a 30-minute audit and we will tell you which lever moves first. No sales sequence.
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