What's a good LTV-to-CAC ratio?

3:1 is the standard benchmark — your LTV should be at least 3x your CAC. Below 3:1, your margins are too thin to absorb fluctuations. Above 5:1 might mean you're under-investing in acquisition and leaving growth on the table.

How do I calculate LTV if my store is new?

With less than 12 months of data, project LTV using: first 90-day revenue per customer (multiply by 4 for annual, then by 2 for 2-year estimate). It's rough, but better than guessing. As you get more data, switch to cohort-based calculation for accuracy.

Does Klaviyo calculate LTV automatically?

Yes. Klaviyo has a Predicted CLV feature that estimates each customer's future value based on purchase history, frequency, and behavioral signals. It updates in real time. Use it for segmentation (target high-LTV customers differently) and for monitoring overall LTV trends.

Should I count subscription revenue differently?

For subscription businesses, LTV = Average Monthly Recurring Revenue x Average Customer Lifespan (in months). A $30/month subscription with 14-month average lifespan = $420 LTV. Subscription models typically have higher and more predictable LTV than one-time purchase businesses.

How often should I recalculate LTV?

Quarterly at minimum. Monthly is better if you're actively testing retention strategies. Calculate overall LTV, LTV by segment, LTV by acquisition channel, and compare cohorts. LTV trends tell you whether your business is getting healthier or weaker over time.

eCommerce Strategy Guide

Brands that know their LTV can outspend competitors on acquisition by 3x. Most brands guess.

Customer lifetime value is the most important number in your business. It determines how much you can spend on ads, how aggressively you can scale, and whether your business model actually works long-term.

If your LTV is $150 and your CAC is $40, you can scale aggressively. If your LTV is $60 and your CAC is $50, you're slowly going broke on every new customer. But most eCommerce brands don't know their LTV — they guess, or worse, they use first-order revenue as a proxy.

Here's how to calculate LTV properly, using both simple and advanced methods, so you can make smarter decisions about every dollar you spend.

Healthy LTV-to-CAC Ratio

67%

More Spent by Repeat Customers

5-7x

Cheaper to Retain vs. Acquire

$23M+

Revenue Driven for Clients

How to fix this — step by step

Calculate basic LTV with the simple formula

Basic LTV = Average Order Value x Purchase Frequency x Average Customer Lifespan. Pull from Shopify: AOV (found in Analytics → Reports → Average order value), Purchase Frequency (total orders / total unique customers over 12 months), and Customer Lifespan (how long the average customer remains active — start with 2 years as a conservative estimate). Example: $75 AOV x 2.3 purchases/year x 2 years = $345 LTV. This gives you a starting point to work with.

Calculate LTV by customer segment for better decisions

Total LTV is misleading because it averages your best customers with your worst. Calculate LTV separately for: customers acquired via paid ads vs. organic, first-time buyers vs. repeat buyers, customers by product category, and customers by acquisition channel. In Klaviyo, use the Predicted Customer Lifetime Value feature — it calculates per-profile LTV based on purchase history and behavioral data. Segment by LTV tier: top 10% (VIPs), middle 50%, and bottom 40%. Your VIP segment's LTV is 5-10x higher than your bottom segment.

Factor in gross margin for actionable LTV

Revenue LTV tells you what a customer spends. Gross Margin LTV tells you what you actually keep. Multiply your revenue LTV by your gross margin percentage. If LTV is $345 and your gross margin is 55%, your gross margin LTV is $190. This is the number that determines how much you can actually afford to spend on acquisition. A $345 LTV with $190 in gross margin means your maximum sustainable CAC is about $63 (LTV/3 ratio) — not $115.

Track cohort-based LTV to see trends over time

Group customers by the month they first purchased and track their cumulative spending over time. This is cohort analysis. In a spreadsheet: Month 0 (first purchase revenue), Month 1 (additional revenue from the same group), Month 2, and so on. After 12 months, you'll see exactly how much each acquisition cohort is worth. More importantly, you'll see if your LTV is improving (retention efforts working) or declining (you're acquiring lower-quality customers).

Use LTV to set your CAC targets and budget allocation

The LTV:CAC ratio determines your marketing budget. Target: 3:1 or higher. If your LTV is $300, target CAC under $100. If a channel delivers $80 CAC, scale it. If another channel delivers $120 CAC, it's unprofitable unless you can improve the LTV of those customers specifically. Also use LTV to choose between channels: if Meta-acquired customers have higher LTV than Google-acquired customers, Meta deserves more budget even if the upfront CAC is similar.

Build systems that increase LTV over time

LTV isn't a fixed number — it's a metric you actively improve. The levers: post-purchase email flows (increase repeat purchases), loyalty programs (reward frequency), subscription models (lock in recurring revenue), cross-sell and upsell (increase per-order revenue), and customer service excellence (reduce churn). Track LTV quarterly by cohort. If newer cohorts have lower LTV than older ones, your retention efforts need work. If they're improving, keep scaling.

Want us to handle this?

Calculating LTV is step one. Using it to make every marketing decision smarter is the real value. We build LTV analysis into every eCommerce program we manage — segmenting customers by value, setting channel-specific CAC targets, and building retention systems that increase LTV over time.

Want to know your real LTV by channel and segment? We'll pull the data, run the analysis, and give you a report you can actually use for budgeting decisions.

Get Your LTV Analysis ReportWe'll walk through your setup live.

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