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    Free SaaS Metrics Tool

    LTV:CAC Calculator

    Measure customer lifetime value against acquisition cost with churn-based math, honest expansion modeling, CAC payback, and cited benchmarks.

    Your unit economics
    Churn-based lifetime with expansion modeled as net retention.
    $

    Average monthly revenue from one customer

    %

    Revenue left after cost of delivering the service

    %

    Share of customers (or revenue) lost per month

    %

    Upsells/upgrades as % of revenue — offsets churn (net retention)

    $
    $

    Acquired by that combined spend

    Healthy unit economics: every $1 of acquisition returns $5.0 over a customer's lifetime.

    • CAC payback of 6.7 months — under the 12-month benchmark.
    • The average customer stays ~33.3 months.
    • Most sensitive input: monthly churn — improve it first.

    LTV:CAC ratio

    5.0:1

    Very strong unit economics — you may even be under-investing in growth.

    Customer LTV

    $2,500

    Over ~33.3 months expected lifetime

    CAC

    $500

    Fully-loaded cost per new customer

    CAC payback

    6.7 months

    Under the 12-month benchmark

    Unit economics summary
    Excellent
    Monthly contribution / customer$75
    Expected customer lifetime33.3 months
    Effective churn (after expansion)3.0% / mo
    Acquisition spend / month$50,000

    Every $500 you spend acquiring a customer returns $2,500 in lifetime gross profit — and you wait 6.7 months to break even on that spend.

    CAC payback timeline
    Cumulative gross profit from one customer vs the cost to acquire them. Where the line crosses CAC is your payback point.
    0123456789101112131415161718192021222324Months since acquisition$0$450$900$1,350$1,800CAC $500
    • Cumulative gross profit
    Sensitivity analysis
    Impact on ltv:cac ratio when each input changes by ±10%, holding everything else constant. Longer bars = assumptions worth validating first.
    4.20:14.60:15.00:15.40:15.80:1Monthly churnRevenue percustomerNew customers /monthGross marginMarketing spendSales spend
    input −10% input +10%Base ltv:cac ratio: 5.00:1
    Industry benchmarks
    Sources: Klipfolio & OpenView SaaS benchmarks (3:1 LTV:CAC target); Bessemer Venture Partners (CAC payback < 12 months for healthy SaaS)
    • LTV:CAC ratio target≥ 3:1You: above
    • CAC payback (healthy SaaS)< 12 monthsYou: within range
    • SaaS gross margin (typical)70–80%You: within range
    How this calculator works

    Recommended next steps

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    Market Sizing Calculator

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