LTV to CAC Ratio Calculator

Background.

The LTV:CAC ratio asks one question: for every dollar you spend acquiring a customer, how many dollars of gross profit does that customer eventually return? It is the headline unit-economics number for subscription businesses, and it is the number an investor will ask for before almost any other. This calculator computes it, classifies it against the two published benchmark sets, and — because the ratio on its own is only a scoreboard — also inverts it to answer the two budget questions that actually change behaviour: the most you can afford to pay for a customer, and the lifetime value you would need to justify the cost you already have.

The benchmark most people quote is 3:1, and it is worth being precise about where it comes from. Bessemer Venture Partners writes that "only after 1x CLTV / CAC are customers profitable to a business; if CAC exceeds CLTV, you should not acquire incremental customers," and recommends "investing in customer acquisition when CLTV / CACs are 3x+." David Skok, independently, writes that "the best SaaS businesses have a LTV to CAC ratio that is higher than 3, sometimes as high as 7 or 8." Two credible investors converging on the same threshold is meaningful. It is not, however, a scientific result: there is no peer-reviewed study establishing 3:1 as an optimum, and this page does not pretend otherwise. Treat it as a widely-agreed working threshold, not a law.

The fastest way to get a flattering ratio is to put the wrong LTV in the numerator, so the page guards against it explicitly. Bessemer's CLTV is "the gross margin-affected value of a customer"; a lifetime value computed on revenue rather than gross profit is larger by one over your gross margin. On this page's worked example the difference is not cosmetic: a business with a revenue LTV of $3,065.25, an 80% gross margin and a $600 CAC reports 5.10875 if it forgets to adjust and 4.087 if it does not. Those two numbers sit in different benchmark bands — the unadjusted figure looks like a top-of-range business and the adjusted one looks like a good but ordinary one. The gross-margin field on this page defaults to 100 so nothing is silently changed, and the converted numerator is printed back to you.

A more uncomfortable caveat concerns what you should do about a ratio you dislike. The instinctive response to a low number is to attack the denominator and cut acquisition cost. Gupta, Lehmann and Stuart measured the relative payoff of exactly that choice across five real firms in the Journal of Marketing Research: a 1% improvement in acquisition cost raised customer value by only 0.02% to 0.3%, while a 1% improvement in retention raised it by 2.45% to 6.75%. The denominator of this ratio is the weaker lever by more than an order of magnitude. If your ratio is below 3, the numerator is almost always where the answer is — and the numerator is churn.

There is also a limit to what the ratio can tell you at all. It is a lifetime measure with no clock in it. A business with a 4:1 ratio that recovers its acquisition cost in six months and a business with a 4:1 ratio that takes thirty months to recover it have identical ratios and completely different funding requirements, because the second one has to finance a much larger hole before the cash comes back. That is what the CAC payback period measures, and it is why Bessemer treats payback rather than the ratio as its primary sales-efficiency metric with targets of under 12 months for SMB-focused businesses, under 18 for mid-market and under 24 for enterprise. Read the two together; neither is sufficient alone.

Finally, the classification on this page is computed from the full-precision ratio rather than the displayed one. That matters because every band edge is a cliff: a ratio of 2.999999999999 displays as 3.00 but has not cleared the 3× threshold, and the verdict tile will say so.

What is ltv to cac ratio calculator?

The LTV:CAC ratio is customer lifetime value divided by customer acquisition cost, both measured for the same cohort of customers. It expresses how many dollars of lifetime gross profit each dollar of acquisition spend buys back. A ratio of 1 means the customer exactly repays the cost of winning them and contributes nothing else; below 1 the business destroys value with every customer it adds. The two components must be measured consistently: the lifetime value should be gross profit rather than revenue, because acquisition cost is real cash out and revenue is not real cash in, and both should describe the same segment — blending enterprise and self-serve customers produces a ratio that describes neither. The ratio is not a GAAP measure and no standards body defines it; the working thresholds come from venture investors, principally Bessemer Venture Partners and David Skok, who independently publish the same 3× guidance. Because the ratio contains no time dimension, it is normally read alongside the CAC payback period, which measures how long the acquisition cost takes to come back in cash. This calculator also inverts the relationship, returning the maximum CAC that a target ratio permits, and the lifetime value a given CAC would require.

How to use this calculator.

1. 01Work one segment at a time. A ratio blended across enterprise and self-serve customers is an average of two different businesses.
2. 02Choose the mode. 'The ratio' scores what you have. 'Max CAC I can afford' turns a target into a spending ceiling for the marketing budget. 'LTV my CAC needs' turns a known cost into a retention target.
3. 03Enter lifetime value on a gross-profit basis. If your figure is revenue-based, enter it and set the gross-margin field to your actual margin so the page converts it — then check the 'gross-profit LTV used' tile to confirm the number the ratio was actually built on.
4. 04Enter a fully loaded CAC for the same cohort and period: paid spend, sales and marketing payroll, agency and referral fees, and acquisition discounts and credits.
5. 05Set the target ratio if you are using an inverse mode. Three is the threshold both Bessemer and Skok publish; raise it if you are capital constrained, because a higher target lowers the CAC you can justify.
6. 06Read the benchmark band next to the number, then open the CAC payback calculator with the same inputs. The ratio tells you whether the customer is worth buying; the payback period tells you how long your cash is tied up while you find out.

The formula.

In ratio mode the numerator is the lifetime value you entered multiplied by the gross-margin field, and the denominator is the acquisition cost; the ratio is one divided by the other. In 'max CAC' mode the same numerator is divided by your target ratio to give a spending ceiling. In 'required LTV' mode the acquisition cost is multiplied by the target ratio to give the lifetime value that target demands. Every mode then reports the same supporting set: net value per customer is numerator minus denominator, return on acquisition spend is that difference over the denominator as a percentage — identically (ratio − 1) × 100 — and CAC share of LTV is the denominator over the numerator, which is exactly 33.3% at a 3× ratio. The benchmark classification is the part worth understanding. Every band edge (1×, 3×, 5×, 8×) is a cliff, so the band is decided from the unrounded arbitrary-precision ratio, before any rounding takes place. A ratio of 2.999999999999 rounds to 3 for display but has not crossed Bessemer's threshold, and the band tile will still read 1–3×. Only the numeric outputs are rounded, once, at the moment they are returned, to ten decimal places. Gross margin must be above zero, and both lifetime value and acquisition cost must be above zero, or the ratio and its derived percentages would be undefined.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Bessemer Venture Partners — D'Onofrio, M. "Scaling to $100 Million" (updated 2024 edition, PDF). Source of the 1× profitability floor ("only after 1x CLTV / CAC are customers profitable to a business; if CAC exceeds CLTV, you should not acquire incremental customers"), the 3x+ invest recommendation, and the SMB/mid-market/enterprise CAC-payback targets of <12, <18 and <24 months. Retrieved 2026-07-29.
2. [2]Skok, D. "SaaS Metrics 2.0 — A Guide to Measuring and Improving what Matters," forEntrepreneurs.com: "The best SaaS businesses have a LTV to CAC ratio that is higher than 3, sometimes as high as 7 or 8." Undated revision, current as retrieved 2026-07-29.
3. [3]Skok, D. "SaaS Metrics 2.0 — Detailed Definitions," forEntrepreneurs.com. Gives the LTV:CAC ratio as LTV ÷ CAC with the guideline that "this number should be higher than 3," and the underlying LTV and CAC definitions used on the linked pages. Retrieved 2026-07-29.
4. [4]Gupta, S., Lehmann, D. R., & Stuart, J. A. (2004). "Valuing Customers." Journal of Marketing Research, 41(1), 7–18. Table 4 reports, across Capital One, Amazon, eBay, Ameritrade and E*Trade, that a 1% improvement in acquisition cost raises customer value by 0.02–0.3% while a 1% improvement in retention raises it by 2.45–6.75%. Author copy hosted by Columbia Business School; retrieved 2026-07-29.
5. [5]Fader, P. S., & Hardie, B. G. S. (2010). "Customer-Base Valuation in a Contractual Setting: The Perils of Ignoring Heterogeneity." Marketing Science, 29(1), 85–93. Shows a valuation built on a single aggregate retention rate "underestimates the value of the customer base by 38%" on their worked example. Author copy; retrieved 2026-07-29.
6. [6]U.S. Securities and Exchange Commission — "Commission Guidance on Management's Discussion and Analysis of Financial Condition and Results of Operations," Release Nos. 33-10751; 34-88094; FR-87, issued 30 January 2020. Requires a clear definition of any disclosed metric and how it is calculated, plus disclosure of the assumptions behind it. Federal Register text via GovInfo; retrieved 2026-07-29.