Customer Lifetime Value (LTV)

What is Customer Lifetime Value?

Customer Lifetime Value (LTV, sometimes written CLV) is the average total revenue a single customer generates from the moment they subscribe until they cancel. It's a forward-looking estimate that tells you how much a customer is worth over their entire relationship with your product — not just this month.

LTV is foundational to understanding unit economics. On its own it's useful, but its real power comes from comparing it to Customer Acquisition Cost (CAC). The LTV:CAC ratio tells you whether your business model makes sense: are you earning enough per customer to justify what you're spending to acquire them?

How to calculate LTV: step-by-step

1. Calculate your ARPU — total MRR divided by total active customers gives your average monthly revenue per user.
2. Calculate your monthly churn rate — customers lost divided by customers at start of month, as a decimal (e.g., 3% = 0.03).
3. Divide ARPU by churn rate — this gives average LTV in dollars.

The math behind this formula: if your monthly churn rate is 3%, the average customer lifespan is 1 ÷ 0.03 = 33 months. Multiply that by your $49 ARPU and you get $49 × 33 = $1,617 LTV. The ARPU ÷ churn formula is just a shortcut to the same result.

The LTV:CAC ratio

LTV in isolation is an incomplete picture. A customer worth $1,633 is great — unless it costs you $5,000 to acquire them. The LTV:CAC ratio puts LTV in context of your acquisition cost:

The most powerful lever for improving LTV is reducing churn

Because churn rate is the denominator in the LTV formula, small reductions in churn produce large improvements in LTV. This is the most important insight about this metric:

• At $49 ARPU and 5% monthly churn: LTV = $49 ÷ 0.05 = $980
• At $49 ARPU and 3% monthly churn: LTV = $49 ÷ 0.03 = $1,633
• At $49 ARPU and 2% monthly churn: LTV = $49 ÷ 0.02 = $2,450

Cutting churn from 5% to 2% — without changing your price at all — increases LTV by 150%. By comparison, raising your price from $49 to $69 (a 41% price increase) while holding churn at 5% only increases LTV to $1,380 — still less than the $1,633 you'd get from fixing churn at your original price point.

This doesn't mean pricing doesn't matter. It means that for most early-stage SaaS products, retention investment delivers better unit economics returns than pricing optimization.

Limitations of the LTV formula

The ARPU ÷ churn formula assumes a constant churn rate over the customer lifetime, which is rarely true in practice. Real businesses see higher churn in early months (customers deciding the product isn't for them) and lower churn from long-tenured customers who are deeply embedded. Use LTV as a directional estimate and planning input — not a precise forecast.

LTV also doesn't account for the time value of money. Revenue earned today is worth more than revenue earned three years from now. For businesses with very long average lifespans, a discounted cash flow approach to LTV is more accurate, though far more complex to calculate.

Related metrics and reading

• Average Revenue Per User (ARPU) — the numerator in the LTV formula; a higher ARPU means higher LTV at any given churn rate.
• Churn Rate — the denominator in the LTV formula; the single most powerful lever for improving LTV.
• Net Revenue Retention (NRR) — the complement to LTV; a high-NRR business often has a rising effective LTV over time as customers expand.
• Customer Lifetime Value: how to calculate and improve LTV for SaaS