Customer Lifetime Value (LTV)
The total revenue you can expect from a single customer over their entire relationship with your business. It's the counterweight to CAC. If CAC tells you what a customer costs, LTV tells you what they're worth.
The formulas
Different business models need different calculations.
For subscriptions and SaaS: LTV = Average Monthly Revenue per Customer / Monthly Churn Rate
A customer paying $50/month with a 5% monthly churn rate: $50 / 0.05 = $1,000 LTV.
For e-commerce and transactional businesses: LTV = Average Order Value x Purchase Frequency x Customer Lifespan
$75 average order x 4 purchases per year x 3 years = $900 LTV.
Quick and dirty estimate: LTV = Total Revenue / Total Unique Customers
Not precise, but good enough for a starting point if you don't have granular data yet.
Why LTV changes everything about your ad strategy
Once you know your LTV, you know how much you can afford to spend acquiring a customer. That changes every decision in your ad account.
If your LTV is $1,000, spending $200 to acquire a customer is reasonable. If your LTV is $100, that same $200 CAC is a fast path to bankruptcy.
The LTV:CAC ratio
This is the number investors and CFOs care about most:
| Ratio | What it means |
|---|---|
| Below 1:1 | Losing money on every customer. Red alert. |
| 1:1 to 3:1 | Breaking even on paper, but once you factor in overhead, probably still losing. |
| 3:1 to 5:1 | The sweet spot. Profitable growth with room to invest. |
| Above 5:1 | You could probably afford to spend more on acquisition. |
Most healthy D2C brands operate somewhere in the 3:1 to 5:1 range.
Industry benchmarks
| Business type | Typical LTV |
|---|---|
| B2B SaaS | $5,000–50,000+ |
| B2C SaaS | $200–2,000 |
| Repeat e-commerce | $150–500 |
| Subscription boxes | $200–600 |
| Mobile apps | $10–100 |
These vary a lot. A niche B2B SaaS with enterprise clients might have LTVs in the six figures. A mobile game might measure LTV in single digits.
Three ways to increase LTV
1. Reduce churn. This has the biggest impact. Improving monthly retention from 95% to 97% might sound small, but it extends average customer lifespan by about 65%. Small churn improvements compound over time.
2. Increase revenue per customer. Upsells, cross-sells, premium tiers, add-on features. If a customer is paying $30/month and you can move them to $50/month, you've increased their LTV by 67% without acquiring anyone new.
3. Increase purchase frequency. For e-commerce, this means email campaigns, loyalty programs, and retargeting that brings customers back for repeat purchases. A customer who buys twice a year is worth half as much as one who buys four times.
How LTV should shape your advertising
Segment your LTV by acquisition channel. Not all customers are worth the same. Customers from Google Search might have a $600 LTV while TikTok customers have $200. That means your allowable CAC should be different for each channel.
Calculate max CAC per channel. If you want a 3:1 LTV:CAC ratio and a channel produces $600 LTV customers, your max CAC for that channel is $200.
Track payback period alongside LTV. A $1,000 LTV customer sounds great, but if it takes 18 months to recoup your acquisition cost, that's a lot of cash tied up.
Use conservative estimates. Better to underestimate LTV and be pleasantly surprised than to overestimate it and overspend on acquisition.
FAQ
What's the difference between LTV and CLV?
Nothing. LTV (Lifetime Value) and CLV (Customer Lifetime Value) mean the same thing. Different companies use different abbreviations.
Should I calculate LTV per cohort?
If you can, yes. Customers acquired in different months or from different channels often behave differently. Cohort-based LTV gives you a much clearer picture than a single blended number.
What if I don't have enough data to calculate LTV?
Start with the quick estimate (total revenue / total customers) and refine as you collect more data. Even a rough LTV is better than no LTV when making ad spend decisions.