LTV:CAC Ratio Calculator
Compute the LTV:CAC ratio and CAC payback period, and check them against the 3:1 SaaS benchmark. Runs in your browser.
Healthy (≥3:1)
CAC payback: 7.5 months ✓ under 12 months
LTV:CAC = lifetime value ÷ acquisition cost. The widely cited SaaS benchmark is ≥ 3:1 — customers worth at least triple their acquisition cost. Below 1:1 you lose money per customer; a very high ratio can mean you should spend more to grow faster. Pair with CAC payback (ideally < 12 months). Informational.
About this tool
The LTV:CAC ratio is the headline measure of whether a business's growth engine is healthy: it divides the lifetime value of a customer by the cost to acquire one. This calculator computes that ratio, judges it against the widely cited benchmark, and — given your monthly gross margin per customer — also reports the CAC payback period, the months of margin needed to recoup acquisition cost. The interpretation is well established: below 1:1 you lose money on every customer and growth is destroying value; 1–3:1 is marginal and signals you need to raise LTV (retention, pricing, expansion) or lower CAC (better targeting, conversion); 3:1 or above is the healthy zone where each customer returns at least triple their cost. Counter-intuitively, a very high ratio (above ~5:1) can indicate under-investment — you could likely spend more to acquire customers faster. Payback under about twelve months is the companion benchmark, since even a great LTV:CAC strains cash if recovery takes years. It is informational, not financial advice. Everything runs in your browser.
How to use it
- Enter your customer LTV and CAC.
- Optionally enter monthly gross margin per customer for the payback period.
- Read the ratio and where it falls vs the 3:1 benchmark.
- Improve LTV or reduce CAC if the ratio is below 3:1.
Frequently asked questions
- What is a good LTV:CAC ratio?
- At least 3:1 is the standard SaaS benchmark — each customer is worth three or more times their acquisition cost. Below 1:1 is unprofitable; 1–3:1 is marginal. Above ~5:1, you may be growing too cautiously and could invest more in acquisition.
- Why can a very high ratio be bad?
- A ratio far above 3:1 often means you are under-spending on growth — you could acquire more customers profitably but are leaving growth on the table. Efficient companies push acquisition until the ratio approaches (but stays above) the healthy threshold.
- What is CAC payback period?
- The number of months of a customer's gross-margin revenue needed to recover the CAC: CAC ÷ monthly margin. Under ~12 months is healthy for SaaS; longer paybacks tie up cash and increase risk even when LTV:CAC looks strong.
- How do I improve a weak ratio?
- Raise LTV (reduce churn, increase prices or upsells, improve retention and expansion) or lower CAC (sharper targeting, higher conversion rates, more efficient channels, referrals). Both move the ratio toward the healthy zone.
- Should LTV use revenue or margin?
- Gross margin. LTV should reflect the profit a customer generates, not revenue, so it is comparable to the real cost of acquiring and serving them. A revenue-based LTV inflates the ratio and can justify overspending.
- Is this financial advice?
- No. It is an informational metric. Use it alongside churn, margins, and cash runway.