marketing
LTV (Customer Lifetime Value)
Total gross profit you can expect from a customer over their full relationship with you.
Definition
LTV is the gross profit earned from a customer across their full lifetime. Standard formula: (avg revenue per customer per period) x (gross margin) x (avg customer lifespan). For service businesses, often annualized: $5K/year x 70% margin x 4 years = $14K LTV. LTV varies dramatically by segment: enterprise customers might have 5-10x the LTV of SMB customers, which justifies very different acquisition costs. Always use gross profit (not revenue) in the LTV calc, otherwise CAC comparisons mislead.
LTV formulas for different business types
For subscription SaaS: LTV = (ARPU x gross margin) / monthly churn rate. So 100 ARPU at 80 percent margin and 3 percent monthly churn yields LTV of 2667. For services with recurring engagements: LTV = average annual revenue per customer x gross margin x average years retained. For one-time transactional businesses: LTV = average order value x gross margin x average lifetime purchases. The single biggest mistake is using revenue instead of gross profit. A 10000 LTV in revenue at 40 percent margin is really 4000 in LTV - and LTV to CAC ratios calculated against revenue tell you nothing about whether you can afford the acquisition.
Adjusting for time and discount rate
Pure LTV ignores time value of money. A customer who pays you 1000 per year for 10 years is not worth 10000 today; it is worth less because future cash is discounted. For US small businesses, apply a 10 to 15 percent annual discount rate to LTV calculations. For VC-backed startups, 20 percent or more is typical. This matters most for long-cycle, low-churn businesses (5+ year retention) where the difference between undiscounted and discounted LTV can be 30 to 50 percent. Tools like Excel's NPV function handle this in one line.
Segment LTV ruthlessly
Blended LTV hides the fact that some customer segments are 5 to 10x more valuable than others. SMB SaaS customers typically churn at 3 to 5 percent monthly and have LTV of 2000 to 8000. Mid-market customers churn at 1 to 2 percent monthly with LTV of 20000 to 80000. Enterprise customers churn at 0.5 to 1 percent monthly with LTV of 200000 to 1000000+. Use this to set channel-specific acquisition budgets: enterprise sales teams can profitably spend 50000 to acquire a customer, while SMB acquisition must stay under 1500. Many US B2B founders accidentally spend enterprise-level CAC on SMB customers and bleed cash for years.
Increasing LTV in practice
Five durable levers, in approximate order of impact. One, reduce churn through better onboarding and customer success - a drop from 5 to 3 percent monthly churn lifts LTV by 67 percent. Two, expansion revenue (upsell, cross-sell, seat growth) - net revenue retention above 110 percent compounds dramatically. Three, raise prices on the back book gradually (5 to 10 percent annual increases). Four, improve gross margin via productization and automation. Five, target higher-LTV ICP segments and stop accepting low-fit customers who churn fast and consume disproportionate support time. Each lever has different time-to-impact and capital requirement.
FAQ
What time horizon should I use for LTV in a startup?
For US SaaS startups under 3 years old, you do not have enough data for true lifetime. Use a 3-year LTV (project gross profit from a customer over 36 months, then stop). This is conservative and defensible. Once you have 5+ years of data, use observed lifetime. Quoting 'infinite LTV' because churn is currently zero is a credibility-killer with sophisticated investors.
Should LTV include expansion revenue?
Yes for SaaS with seat-based or usage-based pricing. Net Revenue Retention (NRR) above 100 percent means existing customers contribute more revenue each year through expansion, which dramatically lifts LTV. The cleanest approach: model base ARPU plus expected expansion rate per year (5 to 20 percent for healthy SaaS) and run the resulting cash flow over the retention period.
How does LTV differ between US and international markets?
US customers generally have higher LTV than equivalent customers in emerging markets because of higher ACV, longer retention, and stronger willingness to pay. European LTV is broadly comparable to US in B2B (sometimes higher for enterprise because of slower switching) but lower in B2C. APAC and LATAM LTV can be 30 to 60 percent lower for the same product. Always segment LTV by geography for any business selling outside one market.
What LTV to CAC ratio is healthy for a US service business?
3:1 is the universally cited target. Below 1:1 you are losing money on every customer. 1:1 to 3:1 you are breakeven to barely profitable. 3:1 to 5:1 is healthy. Above 5:1 you are likely under-investing in growth (you could spend more on CAC and still profit). The benchmark holds for US consulting, agencies, and B2B SaaS across stages.
Does LTV change after a price increase?
Yes, and not always in the obvious direction. A 10 percent price increase lifts ARPU by 10 percent, but if it also raises churn from 3 to 5 percent monthly, LTV drops because churn moves the denominator more than price moves the numerator. Always test pricing changes on a cohort, measure churn impact over 90 to 180 days, and only roll out broadly if LTV improves on net. US SaaS companies that have done this well (Notion, Linear, Figma) raise prices in small increments with strong communication.
In your business
- →Segment LTV by acquisition channel - some channels acquire higher-LTV customers
- →Use gross profit, not revenue, in the LTV calculation
- →Don't just chase low CAC; chase high LTV