Customer Lifetime Value (LTV / CLV)

Calculating Customer Lifetime Value

The standard SaaS formula: LTV = Average MRR per customer × Gross margin % ÷ Monthly churn rate. A customer paying $200/month at 80% gross margin with 2% monthly churn has an LTV of $8,000. This version accounts for the profitability of each dollar of revenue, not just top-line value.

A simpler proxy used by many teams: LTV = ARPU ÷ Churn rate. This is less accurate but easier to calculate and sufficient for high-level unit economics checks. Whichever formula you use, consistency matters more than precision — as long as you're tracking the same number over time, trends will be meaningful.

What Drives LTV in SaaS

LTV is determined by two things: how long customers stay (retention) and how much they pay over that time (revenue per customer, including expansion). These compound each other. A customer who churns after 6 months at $100/month is worth far less than one who stays 3 years and expands from $100 to $300/month.

This means the highest-leverage investments for LTV are onboarding (to reduce early churn), product depth (to create stickiness), and expansion paths (to grow revenue per account over time). Reducing churn by even 1 percentage point per month can double LTV for high-churn products.

LTV:CAC: The Core Growth Health Check

LTV is most useful when paired with CAC. The LTV:CAC ratio tells you whether your business model is fundamentally sound. At 3:1, you're generating $3 of lifetime value for every $1 spent on acquisition — the widely accepted threshold for a healthy SaaS business.

Below 1:1, you're destroying value on every customer. Above 5:1, you may be growing too slowly relative to how efficiently your unit economics are working. Investors watch this ratio closely, especially as you scale — a deteriorating LTV:CAC ratio under growth pressure is a red flag for business model risk.

Expansion Revenue and LTV

One of the most powerful ways to increase LTV is to build expansion into the product itself. Seat-based pricing grows LTV as teams grow. Usage-based pricing grows LTV as customers get more value. Upsell paths to higher tiers create natural revenue expansion without additional acquisition cost.

When expansion revenue exceeds churn revenue, you achieve negative net revenue churn — your existing customer base grows in value even without any new acquisitions. Companies at this stage can sustain growth indefinitely from their existing base, which is the most capital-efficient position in SaaS.