Customer LTV Calculator

A healthy LTV:CAC ratio is typically 3:1 or higher, meaning each customer should generate at least 3x their acquisition cost in profit. Below 3:1 indicates you're spending too much on acquisition relative to customer value. Above 5:1 suggests you may be underinvesting in growth and missing market opportunities. For e-commerce specifically, 3:1 to 5:1 is considered optimal, with subscription businesses often achieving higher ratios due to predictable recurring revenue.

For new businesses, start with 12-24 months as a baseline. For existing businesses, analyze your customer data: calculate the average time between first and last purchase, then add time since last purchase for active customers. Cohort analysis is most accurate — track when customers from each month stop purchasing. Seasonal businesses should use annual customer value divided by 12. Subscription businesses can use 1/churn rate (e.g., 5% monthly churn = 20 month average lifetime).

Always use net profit LTV for acquisition and budget decisions — it reflects actual profitability. Gross LTV is useful for understanding revenue potential and capacity planning. For CAC decisions, net LTV ensures you're not spending more on acquisition than you'll earn in profit. However, gross LTV can justify higher CAC if you're in growth mode and prioritizing market share over immediate profitability. The key is knowing your break-even point: CAC should never exceed Net LTV.

Recalculate quarterly for stable businesses, monthly for growing startups or during major changes (new products, pricing changes, market expansion). Track LTV by customer segment — different products, channels, and geographies often have significantly different LTVs. For example, customers acquired through Facebook may have different LTV than those from Google Ads. Segment-specific LTV helps optimize channel mix and acquisition budget allocation.

A ratio below 3:1 signals one or more issues: (1) CAC too high — optimize ad targeting, improve landing pages, test new channels, or negotiate better rates. (2) Profit margin too low — raise prices, reduce product costs, or cut shipping expenses. (3) Purchase frequency too low — implement loyalty programs, email marketing, or subscription models. (4) Customer lifetime too short — focus on retention through better onboarding, customer service, and product quality. Usually, a combination of improvements across all areas yields the best results.

LTV measures customer value over their entire relationship, while ROI and ROAS measure campaign performance. ROAS = Revenue / Ad Spend (immediate campaign efficiency). ROI = Profit / Investment (overall profitability). LTV extends beyond the first purchase to include repeat purchases, cross-sells, and referrals. A campaign with low ROAS might still be profitable if those customers have high LTV. Conversely, high ROAS doesn't guarantee long-term success if customers don't return. Use all three: ROAS for campaign optimization, LTV for acquisition budgeting, and ROI for overall business health.