Customer Lifetime Value Calculator
Estimate the total profit a customer generates over their entire relationship with your business. The key number for deciding how much you can afford to spend acquiring customers.
Last updated: May 2026
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About this calculator
Customer lifetime value (CLV or LTV) estimates the total profit a single customer contributes over the whole time they remain a customer. This calculator uses a straightforward version: CLV = (monthly revenue × customer lifespan) × profit margin, where monthly revenue is the average revenue per customer per month, customer lifespan is how many months the average customer stays, and profit margin is the fraction of that revenue you keep as profit. Multiplying revenue by lifespan gives total lifetime revenue, and applying the margin converts it to lifetime profit. CLV is one of the most important metrics in business because it sets the ceiling on what you can profitably spend to acquire a customer — sustainable businesses keep their customer acquisition cost (CAC) well below CLV, with a CLV:CAC ratio of roughly 3:1 often cited as healthy. It also reframes customers as long-term assets rather than one-time transactions, which justifies investing in retention, service, and loyalty. Edge cases and refinements: this simple model assumes steady revenue and a fixed lifespan, whereas more sophisticated versions discount future cash flows to present value (since a dollar next year is worth less than one today) and incorporate churn rate, where lifespan ≈ 1 ÷ monthly churn. A longer lifespan or higher margin dramatically increases CLV, which is why reducing churn even slightly can be more valuable than acquiring new customers. Treat the result as a planning estimate that improves as your revenue, margin, and retention data mature.
How to use
Example 1 — $100 monthly revenue, 24-month lifespan, 20% profit margin. Enter Monthly Revenue = 100, Customer Lifespan = 24, Profit Margin = 20. CLV = (100 × 24) × 0.20 = 2400 × 0.20 = $480. Verify: the customer generates $2,400 in lifetime revenue, of which you keep 20%, or $480 in profit — so you could spend up to roughly $160 to acquire them and still hit a 3:1 CLV:CAC ratio. Example 2 — $150 monthly revenue, 36-month lifespan, 25% margin. Enter 150, 36, 25. CLV = (150 × 36) × 0.25 = 5400 × 0.25 = $1,350. Verify: the longer lifespan and higher margin nearly triple the value versus the first example, illustrating how retention and margin drive CLV far more than monthly revenue alone.
Frequently asked questions
How is CLV used with customer acquisition cost (CAC)?
CLV and CAC are most powerful together as the CLV:CAC ratio, which tells you whether your growth is economically sustainable. A widely cited benchmark is a ratio of about 3:1 — for every dollar spent acquiring a customer, you eventually earn three dollars of lifetime profit. A ratio near 1:1 means you barely break even and cannot afford to grow, while a very high ratio (say 5:1 or more) may signal you are underinvesting in marketing and leaving growth on the table. CLV sets the absolute ceiling on what you can spend to acquire a customer profitably. Tracking both metrics together is fundamental to disciplined, scalable growth.
Why does reducing churn increase CLV so much?
Because customer lifespan is a direct multiplier in the CLV formula, and lifespan is inversely related to churn — roughly lifespan ≈ 1 ÷ churn rate. Cutting your monthly churn from 5% to 2.5% roughly doubles the average lifespan and therefore doubles CLV, all without spending a cent on acquisition. Retained customers also tend to spend more over time and cost less to serve, compounding the benefit. This is why mature companies often find that small improvements in retention beat aggressive new-customer acquisition for boosting profit. Reducing churn is frequently the highest-leverage growth lever available.
Should CLV account for the time value of money?
More rigorous CLV models do discount future profits to present value, because a dollar earned three years from now is worth less than a dollar today. This calculator uses a simpler undiscounted version, which is fine for quick planning and short customer lifespans but tends to overstate value for long relationships. If your customers stay for many years, applying a discount rate gives a more conservative and accurate figure. The longer the lifespan and the higher your cost of capital, the more discounting matters. For early-stage estimates the simple model is adequate; for financial modeling, use the discounted version.
What is a common mistake when calculating CLV?
A frequent error is using revenue instead of profit, which massively overstates the value a customer actually contributes — always apply your margin. Another is assuming an overly optimistic customer lifespan or ignoring churn entirely, which inflates the figure. People also forget that CLV is an average; a few high-value customers can skew it, so segmenting customers often reveals more than a single blended number. Finally, treating CLV as fixed is a mistake, since it changes as pricing, retention, and costs evolve. Use realistic margin and lifespan inputs, and recompute as your data improves.
When should I NOT rely on this CLV calculation?
This simple model assumes steady monthly revenue, a fixed lifespan, and a constant margin, so it is unreliable for businesses with highly variable spending, seasonal patterns, or rapidly changing retention. It does not discount future cash flows, so it overstates value for long-lived customers — use a discounted model there. For brand-new businesses without real retention data, the lifespan input is a guess, making the output speculative. It also produces a single average that can hide large differences between customer segments. Treat it as a directional planning tool for acquisition budgeting, and graduate to a cohort-based, churn-aware, discounted model as your data matures.