Quick answer
A $2,500-a-month retainer client who stays 20 months at 80% gross margin is worth $44,000 in lifetime profit. That caps what you can spend to win one at $11,000 on a 4:1 LTV-to-CAC ratio — and the cost pays back in 5.5 months.
How the Client Lifetime Value (LTV) Calculator works, step by step
Enter your average monthly retainer, your monthly churn rate, your gross margin, the expansion you expect from upsells and rate rises, and your target LTV-to-CAC ratio. The calculator turns those five inputs into a lifetime value, a maximum acquisition cost and a payback period — the three numbers that decide whether a marketing channel is worth paying for.
Client lifespan is 1 ÷ monthly churn rate, capped at 60 months. At 5% monthly churn, the average client stays 20 months; at 10%, only 10 months. Small churn changes swing lifetime value hard, which is why retention work — onboarding, regular check-ins, quick responses — usually pays better than new-client marketing. The 60-month cap keeps the math honest for very low churn: at 1% monthly churn the raw formula would claim a 100-month lifespan, which no freelancer should plan around.
Gross lifetime value is the monthly retainer × lifespan × (1 + expansion %). The expansion input captures the retainer growing over the relationship: a 10% expansion on a $2,500 retainer adds $250 a month of eventual value. Net lifetime value then applies your gross margin, because revenue is not value — subcontractors, software and delivery time come out first.
Maximum CAC is net lifetime value ÷ your target ratio. At 4:1, a client worth $44,000 justifies up to $11,000 of acquisition cost. The payback period divides that maximum by monthly gross profit: $11,000 ÷ $2,000 a month is 5.5 months before the client has paid back what they cost to win.
The health rating reads the result back to you: churn above 15% a month is critical, a payback longer than 6 months is at risk, longer than 3 months is fair, and anything shorter is strong. Use the maximum CAC as a hard ceiling when pricing ads, referral fees or platform commissions — a channel that costs more per client than the ceiling loses money however good it looks.
The formula
Net LTV = monthly retainer × (1 ÷ monthly churn rate) × (1 + expansion %) × gross margin %. Maximum CAC = net LTV ÷ target LTV:CAC ratio. Payback = maximum CAC ÷ monthly gross profit.
Worked example — try it on the calculator above
Worked example: $2,500 retainer, 5% monthly churn
A $2,500 monthly retainer with 5% monthly churn gives a lifespan of 1 ÷ 0.05 = 20 months. Gross lifetime value is $2,500 × 20 × 1.10 (10% expansion) = $55,000, and at 80% gross margin the net lifetime value is $44,000. On a 4:1 target ratio, the maximum acquisition cost is $44,000 ÷ 4 = $11,000. Monthly gross profit is $2,500 × 80% = $2,000, so the payback period is $11,000 ÷ $2,000 = 5.5 months, rated Fair. If churn doubled to 10%, lifespan would halve to 10 months and net lifetime value would fall to $22,000.
Frequently Asked Questions
What is client LTV?
Client lifetime value is the total gross profit a client generates over the whole relationship, after delivery costs. It is the monthly retainer × how many months the client stays × your gross margin, with expansion from upsells added. At the defaults — $2,500 a month, 20 months, 80% margin — one client is worth $44,000.
What is a good LTV to CAC ratio for freelancers?
A healthy ratio is 3:1 or higher: each dollar spent winning a client returns at least three dollars of lifetime profit. This calculator defaults to 4:1, which caps acquisition cost at $11,000 for a client worth $44,000. Below 1:1 you lose money on every client you win, however busy the business looks.
How do you calculate LTV for retainer clients?
Divide your average monthly profit per client by your monthly churn rate. At $2,000 of monthly gross profit and 5% churn, lifetime value is $2,000 ÷ 0.05 = $40,000 before expansion. This calculator adds an expansion factor for upsells and rate rises, then applies your gross margin to get net lifetime value.
Why should I include gross margin in my LTV calculation?
Revenue is vanity; profit is what you can spend. If a client pays $5,000 a month but costs $4,000 in subcontractors and software to serve, the client is worth $1,000 a month to your business, not $5,000. At the defaults, the 80% margin turns $55,000 of lifetime revenue into $44,000 of lifetime profit.
Estimates, not advice. This calculator provides educational estimates based on the inputs you enter and the assumptions shown on this page. It is not financial, tax or investment advice, and it cannot see your full situation. Verify important figures against official sources, and consider a qualified professional for decisions about your own money. See our Disclaimer and Methodology.