Glossary • Marketing & Business Leadership

What Is Customer Lifetime Value (LTV)?

By Mark Gabrielli · Last updated: April 2026

Customer Lifetime Value (LTV), also written as CLV or CLTV, is the total net revenue a business expects to generate from a customer over the entire duration of the relationship. It is one of the most important metrics in marketing and finance for understanding customer profitability and guiding acquisition investment.

LTV Definition and Formula

LTV Formula (Simple)

LTV = Average Revenue Per Account (ARPA) x Gross Margin x Average Customer Lifespan

For subscription businesses, a common simplification is: LTV = ARPA x Gross Margin / Churn Rate

For example: $1,000/month ARPA, 80% gross margin, 2% monthly churn = $40,000 LTV.

LTV:CAC Ratio

The LTV:CAC ratio is the most important investor and operator metric for evaluating GTM efficiency. It tells you how much value you generate relative to what you spend to acquire each customer.

Below 1:1 — You're losing money on every customer. Not sustainable.
1:1 to 2:1 — Marginal. Indicates overspending on acquisition or poor retention.
3:1 — Healthy. Standard benchmark for SaaS businesses.
5:1+ — Either very efficient, or underspending on growth. May be leaving revenue on the table.

How to Increase LTV

Reduce churn through improved onboarding and customer success
Expand revenue through upsell and cross-sell motions
Increase product stickiness and switching costs
Target higher-value ICP segments with naturally higher ARPA
Build community and relationships that reduce churn

Related Resources

Frequently Asked Questions

What is the difference between LTV and CLV? +

LTV (Lifetime Value) and CLV (Customer Lifetime Value) mean the same thing. CLTV is another abbreviation for the same metric. All three refer to the total expected revenue or profit from a customer relationship.

Should LTV be based on revenue or profit? +

LTV is most useful when calculated on gross margin (revenue minus cost of goods sold), not top-line revenue. Using gross margin-adjusted LTV gives a more accurate picture of true customer profitability.

How does LTV affect marketing budget decisions? +

LTV sets the ceiling for how much you can afford to spend to acquire a customer. If LTV is $10,000 and you target a 3:1 LTV:CAC ratio, your maximum CAC is $3,333. This directly informs how much you can spend per channel and campaign.