LTV:CAC Ratio Calculator
Compute LTV:CAC ratio, customer lifetime, and CAC payback period for any SaaS business. Industry benchmark: 3x+ is healthy, sub-1 means you are bleeding cash.
LTV:CAC Ratio Calculator
Revenue per customer
Churn + acquisition cost
LTV swing at different monthly churn rates
How to use the LTV:CAC Ratio Calculator
Pull your true ARPC and gross margin
ARPC = MRR ÷ paying customers (not signups, not free-trial users — paying). For annual plans, divide annual contract value by 12. Gross margin is net of hosting, payment processor fees, customer support, and any cost-of-delivery — not sales and marketing. Most SaaS lands between 70% and 85%; if yours is much lower, you may be measuring revenue-with-COGS instead of true gross margin.
Use monthly customer churn — not revenue churn
This calculator uses customer (logo) churn for lifetime calculation. If you have negative net revenue churn (expansion exceeds contraction), customer-churn LTV is the conservative floor — your actual LTV is higher. SMB SaaS typically sees 3–5% monthly customer churn, mid-market 1–2%, enterprise under 1%. If you do not yet have 12 months of cohort data, take your best estimate and stress-test using the scenario table.
Compute fully-loaded CAC, not just paid-ad spend
CAC must include all sales and marketing costs for the period — salaries, ad spend, content, sales tools, demo infrastructure, BDR commissions — divided by new paying customers acquired in that same period. Founders often understate CAC by 2–3x by counting only paid ads. Use the higher number; it is the one your investors will compute on your behalf.
Read the ratio against the 3x rule
The verdict band tells you where you sit: bleeding (<1), sub-par (1–3), healthy (3–5), or exceptional (5+). Then look at the scenario table — it shows your LTV at six different churn rates. If your ratio is "healthy" only because you used optimistic 1% churn, the table reveals the risk. Aim to be healthy across realistic churn scenarios, not just the best case.
LTV:CAC — the single number that decides whether a SaaS business is real
LTV:CAC is the canonical health metric of subscription businesses. It answers one question with brutal clarity: for every dollar you spend acquiring a customer, how many dollars of contribution margin do you eventually get back? If the answer is less than one, you are losing money on every customer and growth makes the problem worse, not better. If the answer is one to three, you cover the acquisition cost but have no headroom — no margin for marketing inefficiency, no contribution to fund growth, and no buffer when churn ticks up. Three or more is the canonical "fundable SaaS" band. Five or more often indicates the business is under-investing in growth and leaving market share on the table. Every major SaaS benchmarking study — Bessemer's State of the Cloud, OpenView's SaaS Benchmarks, KeyBanc's SaaS Survey — converges on the same threshold: 3x is the minimum bar.
Why exactly 3x — not 2x, not 4x
The 3x rule decomposes cleanly. The first 1x covers the cost of acquiring the customer — you broke even. The second 1x is buffer for marketing inefficiency: not every dollar of CAC actually produces a customer, some acquisition channels degrade as you scale them, and some customers churn early. The third 1x is genuine value creation — contribution that funds product development, headcount expansion, and the next round of growth investment. Below 3x there is no third dollar, which means the business has no engine to fund itself from operating cash. It can still grow if investors keep injecting capital, but the unit economics do not work without that subsidy. Below 1x — the "bleeding" band — even the first dollar is missing. The business is paying to acquire customers who will never collectively return the acquisition cost. Scaling makes the deficit larger. This is a kill-or-fix signal, not a growth signal.
LTV:CAC below 3 says you are paying to acquire customers but not earning enough to scale. Below 1 says you are literally lighting cash on fire — every new sale deepens the hole.
Gross LTV vs net contribution LTV — only the latter is meaningful
A common mistake is computing LTV as ARPC × lifetime — gross revenue times customer lifetime, ignoring margin. This always overstates the true number, often by 20–40%. The honest formula multiplies ARPC by the gross margin to get monthly contribution, then by customer lifetime. A $100/month customer at 80% gross margin and 33-month lifetime produces $2,640 in net contribution LTV — not $3,300 in gross LTV. The ratio against CAC must use net contribution; otherwise you flatter the business by 25% on a single accounting choice. For more rigorous valuations, sophisticated operators also discount future contribution back to present value (NPV-style LTV) using a discount rate of 10–15%, or compute cohort-based LTV directly from observed cohort retention curves rather than assuming geometric decay. Both refinements typically lower the number — never raise it.
The ASEAN SaaS angle
Regional SaaS faces a structural disadvantage on LTV:CAC: smaller addressable markets mean less product-led pull, more outbound sales effort, and shorter average customer lifetimes as buyers shift between vendors. Singapore SaaS unicorns like Carousell, Carro, and Patsnap operate against this constraint daily — their CAC is comparable to US peers (talent and ad costs are global) but their TAM is a fraction. The compensation is to target a higher LTV:CAC ratio. ASEAN SaaS investors increasingly expect 4–5x to fund Series A — versus the 3x global minimum — because the smaller market gives less room to fix unit-economics drift later. This pushes ASEAN SaaS founders toward higher-ARPC enterprise plays earlier, prosumer pricing that compresses CAC via product-led growth, and ruthless churn focus from year one. The math is the same; the bar is higher.
10 Things to Know About LTV:CAC
The 3x rule was popularised by David Skok (Matrix Partners) circa 2008 and has held up across two decades of SaaS funding cycles as the minimum bar for a fundable business.
LTV is non-linear in churn. Halving monthly churn from 4% to 2% doubles customer lifetime from 25 to 50 months — and doubles LTV. Small churn improvements compound enormously.
Gross LTV ≠ net contribution LTV. Using revenue without margin overstates LTV by 20–40% depending on COGS. Only contribution-margin LTV belongs in the ratio.
The CAC payback period is the cash-flow companion to LTV:CAC. SMB SaaS targets 6–12 months; mid-market 9–12; enterprise tolerates 12–18. Anything beyond 24 needs venture capital subsidy.
A ratio above 5x often means under-investment in growth, not exceptional product-market fit. Competitors will catch up; spend the surplus on CAC while the math still works.
Negative net revenue churn (expansion > contraction) means customer-lifetime LTV underestimates the truth. The "Rule of 120%" — net revenue retention above 120% — is the gold standard for top-tier SaaS.
Bessemer's State of the Cloud consistently reports that top-quartile SaaS companies post LTV:CAC ratios between 4x and 7x. Below 3x rarely closes a Series B at standard multiples.
ASEAN SaaS — operating against smaller markets — typically needs to target 4–5x LTV:CAC to attract regional VC, versus the 3x global minimum. Smaller TAM means less room to fix drift.
The 1/churn formula assumes geometric churn decay (constant monthly probability). Cohort-based LTV — measured directly from observed retention curves — is more accurate but requires 12+ months of data.
NPV-style LTV applies a discount rate (typically 10–15%) to future contribution, recognising that a dollar received in month 36 is worth less than a dollar today. Always lowers the ratio versus the simple formula.
Frequently Asked Questions
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The 3x rule decomposes into three jobs each dollar must do. The first dollar covers the cost of acquiring the customer (break-even). The second dollar is buffer for marketing inefficiency — not every channel scales linearly and some customers churn early. The third dollar is genuine value creation that funds growth from operating cash. Below 3x the business has no third dollar, meaning growth must be subsidised by investor capital indefinitely.
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Below 1 means every customer costs more to acquire than they will ever pay back in contribution margin over their lifetime. You are literally losing money on every sale. Scaling makes the loss bigger, not smaller — the opposite of how growth normally works. Either CAC must fall, churn must fall, or pricing must rise dramatically. A business stuck below 1x is not a "needs to scale" problem; it is a "needs a different model" problem.
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Always contribution margin LTV. Gross revenue LTV ignores cost of delivery (hosting, support, payment processing) and inflates the ratio by 20–40%. The honest formula is ARPC × gross margin × customer lifetime. Investors will compute the contribution version on your behalf, so flatter numbers in your pitch deck only set you up for an embarrassing diligence conversation.
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LTV:CAC measures eventual return per acquisition dollar — a profitability metric. CAC payback measures how fast the cash comes back — a liquidity metric. A company can have a healthy 4x LTV:CAC but a 30-month payback period, meaning growth ties up cash for years. SMB SaaS targets payback under 12 months; enterprise tolerates 12–18; anything beyond 24 requires external funding to scale.
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Two interpretations. (1) Exceptional product-market fit with low churn and viral acquisition — congratulations, you have one of the rare businesses. (2) More commonly, you are under-investing in growth. Your acquisition channels still work but you are not spending enough on them. Competitors will catch up; the window to grow aggressively while the math is favourable closes quickly. Reinvest the surplus into CAC before someone else does.
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Yes — fully-loaded CAC includes all sales and marketing costs: ad spend, BDR/AE salaries and commissions, marketing team headcount, content production, demo infrastructure, sales tools. Divide the total period cost by new paying customers acquired in that period. Founders who count only paid-ad CAC understate the true number by 2–3x. Investors will always compute the fully-loaded version.
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If your expansion revenue exceeds contraction/churn, customer-churn-based LTV understates the truth. The simple 1/churn formula assumes flat ARPC over the customer lifetime; if existing customers expand spending over time, real LTV is higher. The conservative approach is to compute customer-churn LTV as a floor, then separately model net revenue retention (NRR) on top. Top-quartile SaaS targets NRR above 120%, which roughly doubles effective LTV versus the customer-churn floor.
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Smaller addressable markets give less room to grow into unit-economics drift later. A US SaaS can hit 3x today and still have years of TAM expansion runway. An ASEAN SaaS often cannot — the market caps out faster, so the business must be more efficient at the start. Regional VCs typically look for 4–5x LTV:CAC at Series A versus the 3x global minimum, particularly for businesses targeting Singapore, Malaysia, or Indonesia as their primary market.
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The 1/churn formula assumes geometric (constant monthly probability) churn — customers leave at the same rate every month. In reality, early-tenure customers churn faster than long-tenure ones. Cohort-based LTV measures the actual cumulative contribution from each acquisition cohort over time, then projects the curve forward. It is more accurate but requires 12+ months of cohort data. For pre-Series A businesses, the simple formula is good enough; for growth-stage businesses raising on unit economics, cohort LTV is the standard.
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No. All calculation happens entirely in your browser via JavaScript — no server, no analytics on the inputs, nothing sent over the network. Open DevTools → Network and watch — there is zero outbound traffic from the calculator.
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