LTV/CAC Ratio Calculator

LTV/CAC ratio is the most-watched unit economics metric in SaaS. It measures how many dollars of lifetime gross profit you generate per dollar of customer acquisition cost. The standard benchmark is 3:1 — below indicates inefficient growth, above 5:1 may indicate underinvestment. CAC payback period (months to recoup CAC from gross profit) should be under 12 months for healthy SaaS. Source: Bessemer Cloud 100, OpenView SaaS Benchmarks 2026.

The Three Levers

To improve LTV/CAC: (1) reduce churn — even a 1% monthly churn reduction can extend lifetime by 4-6 months and boost LTV 20%+. (2) Raise prices — a 5% price increase typically loses 1-2% of customers but adds 3-4% to gross profit. (3) Lower CAC via better channels — SEO, referrals, and PLG typically have CAC payback under 6 months vs paid ads at 18-24 months. Most SaaS leaders focus on churn first because it compounds.

CAC Payback vs LTV/CAC

CAC payback is the cash-flow lens: how long until you have back the money spent acquiring the customer. LTV/CAC is the return lens: total value extracted divided by investment. Both matter — fast payback (under 12 months) means less working capital required; high LTV/CAC means high return. A 6:1 LTV/CAC ratio with 24-month payback means great long-term returns but requires patient capital. A 2:1 with 6-month payback is fast cash but limited overall returns.

Common Pitfalls

(1) Including only paid-media CAC and excluding sales rep cost — adds 30-50%. (2) Using gross revenue instead of gross profit for LTV — overstates LTV by the COGS percent. (3) Ignoring expansion revenue (NDR > 100%) which can lift LTV 50-200% above churn-based estimate. (4) Calculating quarterly when SaaS funnels mature over 12-24 months. (5) Mixing self-serve and sales-led segments in one number — calculate separately for accuracy.

Last updated May 2026. Sources: OpenView SaaS Benchmarks 2026, Bessemer Cloud Index.