The simplest SaaS LTV formula is ARPU / Monthly Churn Rate. For a $80/month product with 3.5% churn, LTV is $2,286. Target an LTV:CAC ratio of 3:1 or higher.

Customer Lifetime Value might be the most important metric that most founders calculate wrong. LTV tells you how much revenue you can expect from a single customer over the entire time they do business with you. Get it right, and you know exactly how much you can afford to spend on acquisition. Get it wrong, and you'll either overspend yourself into a cash crisis or underspend and lose market share to competitors who understand their numbers better.

This guide covers three methods to calculate LTV, shows you what good looks like with current benchmarks, and walks through the mistakes that trip up even experienced operators.

Why LTV Matters

LTV isn't just an academic exercise. It drives some of the most consequential decisions in your business:

Acquisition budget: How much can you spend to acquire a customer and still make money? Your LTV sets the ceiling.
Product investment: Should you invest in features that increase retention or features that attract new customers? LTV math answers this.
Pricing strategy: Is your pricing leaving money on the table? Comparing LTV across segments reveals where to charge more.
Fundraising: Investors want to see LTV:CAC ratios before writing checks. A strong LTV signals a durable business.

Method 1: Simple LTV

This is the quickest calculation and works well for e-commerce, marketplaces, and subscription businesses with stable behavior.

Simple LTV = Average Revenue Per Customer x Average Customer Lifespan

Or equivalently:

Simple LTV = Average Order Value x Purchase Frequency x Average Customer Lifespan

Worked Example: E-Commerce

Your online store's average customer:

Spends $75 per order
Places 4 orders per year
Stays active for 2.5 years

LTV = $75 x 4 x 2.5 = $750

This means each customer generates $750 in revenue over their relationship with your business. If your gross margin is 45%, the gross profit LTV is $337.50.

Important: Always calculate LTV on gross profit, not revenue, when making spending decisions. You can't spend $400 to acquire a customer with $750 in revenue if $412 of that goes to cost of goods sold.

Method 2: SaaS LTV

For SaaS businesses, LTV = ARPU / Monthly Churn Rate. Cutting churn from 5% to 2% increases LTV by 150%, making retention the highest-leverage growth activity.

For subscription businesses with monthly or annual recurring revenue, this formula is more precise because it factors in churn directly.

SaaS LTV = ARPU / Monthly Churn Rate

Or for a gross-profit-adjusted version:

SaaS LTV = (ARPU x Gross Margin) / Monthly Churn Rate

ARPU stands for Average Revenue Per User (per month).

Worked Example: SaaS Product

Your SaaS product:

ARPU: $80/month
Gross margin: 78%
Monthly churn rate: 3.5%

Revenue LTV = $80 / 0.035 = $2,286

Gross Profit LTV = ($80 x 0.78) / 0.035 = $1,783

This means each customer generates roughly $2,286 in revenue (or $1,783 in gross profit) before they churn. At 3.5% monthly churn, the implied average customer lifespan is about 29 months (1 / 0.035).

Why Monthly Churn Is So Powerful

Small changes in churn have outsized effects on LTV. Here's how the same $80/month ARPU looks at different churn rates:

Monthly Churn	Implied Lifespan	Revenue LTV	Change vs 5%
5.0%	20 months	$1,600	Baseline
4.0%	25 months	$2,000	+25%
3.0%	33 months	$2,667	+67%
2.0%	50 months	$4,000	+150%
1.0%	100 months	$8,000	+400%

Cutting monthly churn from 5% to 2% doesn't just improve LTV a little. It increases it by 150%. This is why retention is the highest-leverage activity in a SaaS business. Every percentage point of churn reduction compounds over the entire customer lifespan.

Method 3: Cohort-Based LTV

The first two methods assume churn is constant over time. In reality, it's not. Most businesses see high churn early (customers who weren't a good fit leave quickly) and lower churn later (customers who stick around past 3 to 6 months tend to stay much longer).

Cohort-based LTV tracks actual revenue from a group of customers who started in the same period.

How It Works

Define a cohort: All customers who signed up in January 2025.
Track monthly revenue: Record how much total revenue that cohort generates each month.
Plot the curve: Chart cumulative revenue per customer over time.
Project forward: Use the observed pattern to estimate where the curve levels off.

Example Cohort Analysis

Month	Active Customers	Revenue	Cumulative Rev/Customer
1	100	$8,000	$80
2	88	$7,040	$150
3	82	$6,560	$216
6	71	$5,680	$432
12	58	$4,640	$812
18	52	$4,160	$1,144
24	48	$3,840	$1,450

In this example, churn was heavy early (12% in month 1) but slowed to about 2% per month by month 12. The simple formula using average churn would underestimate LTV because it applies the high early churn rate across the full lifespan.

Cohort analysis is more work but gives you the most accurate picture, especially if your product has a learning curve or onboarding period that affects early retention.

LTV Benchmarks by Business Model

What does good LTV look like? It depends entirely on your business model and customer segment.

Business Model	Typical LTV Range	Key Driver
Enterprise SaaS (ACV $50K+)	$150,000 to $500,000+	Low churn, expansion revenue
Mid-Market SaaS (ACV $10K to $50K)	$30,000 to $120,000	Moderate churn, some expansion
SMB SaaS (ACV $1K to $10K)	$3,000 to $15,000	Higher churn, price-sensitive
Consumer SaaS (ACV under $500)	$200 to $2,000	High volume, high churn
E-Commerce (DTC)	$150 to $1,500	Repeat purchase rate
Marketplace	$500 to $5,000	Transaction frequency
Professional Services	$5,000 to $50,000	Project recurrence

Enterprise SaaS has the highest LTV because customers sign large annual contracts, churn is low (often under 5% annually), and expansion revenue from adding seats or upgrading plans grows the account over time. SMB SaaS has lower LTV because customers are more price-sensitive, easier to lose to competitors, and less likely to expand.

The LTV:CAC Ratio

A healthy LTV:CAC ratio is 3:1, meaning each customer generates 3x what it costs to acquire them. Below 3:1, you're subsidizing growth; above 5:1, you may be underinvesting.

LTV on its own doesn't tell you if your business is healthy. You need to compare it to what you spend to acquire each customer.

LTV:CAC Ratio = Customer Lifetime Value / Customer Acquisition Cost

LTV:CAC Ratio	Rating	What It Means
Under 1:1	Critical	You're losing money on every customer
1:1 to 2:1	Concerning	Barely covering acquisition costs, no room for error
3:1	Target	The benchmark most investors and operators aim for
4:1 to 5:1	Strong	Healthy unit economics with room to invest
Above 5:1	Too high?	May be underinvesting in growth

The 3:1 ratio is the standard benchmark, and it comes from the math of sustainable growth. At 3:1, roughly one-third of LTV covers acquisition cost, one-third covers the cost of serving the customer, and one-third is profit. Below 3:1, you're subsidizing growth. Above 5:1, you may be growing too slowly relative to your opportunity.

LTV:CAC by Company Stage

Early-stage companies often have poor LTV:CAC ratios because they haven't optimized acquisition channels yet and churn is still being addressed.

Stage	Typical LTV:CAC	Context
Pre-Seed/Seed	1:1 to 2:1	Normal. Focus on product-market fit first.
Series A	2:1 to 3:1	Should be trending toward 3:1.
Series B+	3:1 to 5:1	Expected. Efficiency matters for continued funding.
Mature/Public	4:1+	Optimized channels and low churn.

If you're at seed stage with a 1.5:1 ratio, don't panic. But know that reaching 3:1 is likely a prerequisite for raising your Series A. Track this monthly and work on both sides: increasing LTV through better retention and reducing CAC through more efficient acquisition.

Common LTV Mistakes

Using Revenue Instead of Gross Profit

An LTV of $10,000 sounds great until you realize your gross margin is 40%, making your actual profit LTV $4,000. If your CAC is $3,500, your LTV:CAC ratio on gross profit is 1.14:1, not the 2.86:1 you calculated on revenue. Always use gross profit for LTV when making acquisition spending decisions.

Assuming Churn Is Constant

Churn changes over time, by customer segment, and with product improvements. A churn rate from 2024 may not reflect your current reality if you've improved onboarding or changed pricing. Recalculate LTV quarterly using recent data.

Over-Projecting Customer Lifespan

Being optimistic about how long customers stay is the fastest way to overestimate LTV. Use actual observed data, not projections. If your company is only 18 months old, you don't have enough data to claim a 5-year customer lifespan.

Ignoring Segment Differences

Average LTV across all customers hides important variation. Enterprise customers might have 5x the LTV of SMB customers. Calculating a blended average and using it to set a single CAC target leads to overspending on small accounts and underspending on large ones.

Not Including Expansion Revenue

On the flip side, some companies underestimate LTV by only counting initial contract value. If your customers typically expand by 20% per year through seat additions or tier upgrades, that growth belongs in your LTV calculation.

How to Increase LTV

The two levers for increasing LTV are reducing churn and increasing revenue per customer.

Reduce Churn

Fix onboarding: Most churn happens in the first 90 days. A better onboarding experience has the highest ROI of any retention initiative.
Monitor engagement signals: Customers who stop using your product are about to churn. Build health scoring to intervene early.
Proactive support: Don't wait for customers to complain. Reach out when you see usage drops or missed milestones.

For a deeper dive into churn, including benchmarks by segment and proven reduction tactics, see our SaaS churn rate guide.

Increase Revenue Per Customer

Upsells and expansions: Build natural upgrade paths in your product. Usage-based pricing creates organic expansion.
Cross-sell additional products: If you serve the customer well in one area, you earn the right to serve them in adjacent ones.
Annual contracts: Customers on annual plans churn at roughly half the rate of monthly subscribers. Offer a discount for annual commitments.

Track LTV Automatically

Manually calculating LTV from spreadsheets is error-prone and quickly outdated. culta.ai connects to your Stripe account and calculates LTV by customer segment, tracks how it trends over time, and shows you your LTV:CAC ratio in real time.

If you're managing multiple products or entities, you can see LTV broken out per business line to understand which ones have the strongest unit economics.

Start free with culta.ai and get immediate visibility into your customer lifetime value. Pair it with our Customer LTV Calculator to model different scenarios and see how improving churn or ARPU impacts your numbers.

Customer LTV Formula: 3 Methods That Work With Limited Data