Value Metric
Lifetime Value of a Customer (LTV)
Lifetime Value (LTV) is the average total revenue a customer generates across their entire relationship with your product.
What is Lifetime Value of a Customer (LTV)?
Lifetime Value of a Customer (LTV) estimates the total gross profit — or, more simply, revenue — you can expect from an average customer over the full length of their relationship with your product. It combines how much a customer pays, how often, and for how long before they churn.
LTV is the ceiling on what you can afford to spend acquiring and serving a customer. It turns retention and pricing from soft goals into a hard number you can weigh against acquisition cost.
How to calculate it
LTV = Average Revenue Per User × Gross Margin × Average Customer Lifespan
- ARPU
- Average revenue per user per period
- Gross Margin
- Share of revenue left after cost of delivery
- Average Customer Lifespan
- How many periods a customer stays, i.e. 1 ÷ churn rate
Worked example
If ARPU is $50/month, gross margin is 80%, and average lifespan is 24 months, LTV = $50 × 0.80 × 24 = $960 per customer.
What good looks like
- Healthy LTV:CAC ratio3:1 to 5:1
Below 3:1 growth is inefficient; far above 5:1 often means you are underinvesting in acquisition.
Source: OpenView — SaaS Benchmarks
- CAC payback< 12 months
The faster you recover acquisition cost, the more of LTV becomes reinvestable profit.
Why it matters
LTV reframes every growth decision. It sets the budget you can justify for acquisition, quantifies exactly what a point of churn or a pricing change is worth, and identifies which customer segments deserve the most product and success investment. Teams that ignore LTV over-optimize for cheap signups and under-invest in the retention that actually compounds revenue.
How to improve Lifetime Value of a Customer (LTV)
Reduce churn
Lifespan is the biggest lever in the formula — cutting monthly churn from 5% to 3% extends average lifespan from 20 to 33 months. Find and fix the moments where value stalls.
Increase expansion revenue
Upsells, cross-sells, and seat expansion raise ARPU across the whole base. Test packaging and in-product upgrade prompts to grow revenue per account.
Improve gross margin
Lowering the cost to serve — support automation, infrastructure efficiency — increases the profit share of every dollar of LTV.
Frequently asked questions
What is a good LTV:CAC ratio?
A ratio around 3:1 is widely considered healthy for SaaS — customers return three times what it costs to acquire them. Below 1:1 you lose money on each customer; much above 5:1 usually signals you could grow faster by spending more on acquisition.
Should LTV use revenue or gross profit?
Gross-profit LTV is the more rigorous choice because it accounts for the cost of serving the customer. Revenue-based LTV is simpler and more common early on, but it overstates value for low-margin businesses.
How do you estimate customer lifespan?
The common approximation is 1 ÷ churn rate. If 4% of customers churn each month, average lifespan is about 25 months. For businesses with little history, use cohort retention curves rather than a single churn number.