LTV:CAC Ratio Calculator
Calculate customer Lifetime Value vs Customer Acquisition Cost — the single most important SaaS unit economics metric for investors and operators.
What Is the LTV:CAC Ratio?
The LTV:CAC ratio compares the total gross profit generated by a customer over their lifetime (LTV) against the cost to acquire that customer (CAC). It is the most fundamental unit economics metric in SaaS and subscription businesses. A ratio of 3:1 or higher signals that each dollar spent on acquisition returns three dollars of profit — the standard investor threshold used by venture capital firms and growth equity investors. Below 1:1 means you are destroying value with every customer acquired. This calculator uses the discounted LTV formula recommended by OpenView Partners and used by most Series A+ investors.
LTV:CAC Formula and Methodology
LTV = (ARPU × Gross Margin %) ÷ (Monthly Churn Rate − Monthly Expansion Rate), discounted for time value. CAC Payback Period = CAC ÷ (ARPU × Gross Margin %), measured in months. The LTV:CAC ratio = LTV ÷ CAC. Benchmarks from Bessemer Venture Partners' State of the Cloud 2026 report: top-quartile SaaS companies achieve LTV:CAC above 5:1 with CAC payback under 12 months. Median public SaaS in 2026: LTV:CAC of 3.2:1, payback of 18 months. Source: Bessemer Venture Partners (bvp.com).
How to Improve Your LTV:CAC Ratio
There are four levers: (1) Reduce churn — every 1 percentage point reduction in monthly churn multiplies LTV by 10–40%. (2) Increase ARPU via upsells and cross-sells — tracked as expansion revenue rate. (3) Reduce CAC by improving conversion rates, lowering paid media CPCs, or investing in product-led growth (PLG) motions where users self-convert. (4) Improve gross margin by reducing COGS through infrastructure optimization, offshore support, or automation. The biggest lever is almost always churn — even small reductions in monthly churn dramatically extend customer lifetime and LTV.
LTV:CAC Benchmarks by Stage (2026)
Pre-Seed/Seed: LTV:CAC above 1:1 acceptable if product-market fit metrics are strong. Series A: investors expect 2:1+ with clear path to 3:1. Series B+: 3:1+ required; top performers show 4–6:1 with payback under 12 months. Public SaaS median (2026): 3.2:1 per Bessemer State of the Cloud. Note: LTV:CAC above 5:1 may indicate under-investment in growth — consider accelerating sales and marketing spend. Source: Bessemer Venture Partners State of the Cloud 2026.
LTV CAC Ratio Calculator: Common Calculation Mistakes
Five mistakes routinely inflate an LTV CAC ratio calculator output and embarrass founders during investor due diligence. (1) Using gross revenue LTV instead of gross-margin LTV — divide LTV by gross margin first; otherwise a 75%-margin SaaS overstates LTV by 33%. (2) Excluding fully-loaded CAC — true CAC includes sales + marketing + sales engineering + fractional executive time + tooling (Salesforce, HubSpot, Outreach). Most founders quote "blended CAC" that misses 20-40% of real spend. (3) Ignoring channel mix — paid-search CAC at $400 looks great until you realize 60% of new logos came from a single channel partner with a 20% rev-share that you forgot to amortize. (4) Using a single annual churn number — early-life churn (first 90 days) is usually 3-5× steady-state churn. Calculate cohort-weighted churn, not blended. (5) Counting upsell as CAC-free revenue — expansion sales still cost something (CSM time, expansion AE comp). Per the SEC Office of Investor Advocate's non-GAAP guidance, public SaaS firms are increasingly fined for LTV:CAC overstatements; private firms should adopt the same discipline 12-18 months before a Series B raise. Updated 2026-06-29.