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UPDATED JUnE'26
LTV/CAC
Calculator — The One Ratio That
Tells It All.
The single most important ratio in SaaS unit economics is LTV:CAC — the relationship between how much a customer is worth over their lifetime versus how much it costs to acquire them. A healthy ratio signals a scalable, fundable, sustainable business.
3:1
Industry Benchmark Ratio
70–85%
Typical SaaS Gross Margin
<12 mo
Healthy CAC Payback
6
Inputs to Full Picture
◆ The Basics
What Is LTV (Customer Lifetime Value)?
LTV (also called CLV or CLTV) is the total revenue a single customer generates throughout their entire relationship with your business.
◆ Core LTV Formula for SaaS ◆
LTV = (Average Revenue Per Account x Gross Margin %) ÷ Monthly Churn Rate
For example: ARPA = $500/month, Gross Margin = 80%, Monthly Churn = 3%
LTV = ($500 × 0.80) ÷ 0.03 = $13,333
◆ The Basics
What Is CAC (Customer Acquisition Cost)?
CAC is the total cost of acquiring one new customer, including all sales and marketing spend divided by the number of new customers acquired in the same period.
◆ CAC Formula ◆
CAC = Total Sales & Marketing Spend ÷ Number of New Customers Acquired
For example: $50,000 spent in Q1, 100 new customers
CAC = $500
◆ The Key Metric
What Is the LTV:CAC Ratio?
The LTV:CAC ratio divides Customer Lifetime Value by Customer Acquisition Cost:
◆ LTV:CAC Ratio Formula ◆
LTV:CAC = LTV ÷ CAC
A ratio of 3:1 means every $1 spent acquiring a customer returns $3 over their lifetime — the widely cited benchmark for a healthy SaaS business. Ratios below 3:1 suggest you're overspending on acquisition or underperforming on retention. Ratios above 5:1 suggest you may be under-investing in growth.
|
LTV:CAC Ratio |
Interpretation |
|---|---|
|
Below 1:1 |
Losing money on every customer |
|
1:1 to 2:1 |
Marginal — review acquisition cost and retention |
|
3:1 |
Healthy SaaS growth — industry benchmark |
|
4:1 to 5:1 |
Very strong performance |
|
Above 5:1 |
Potentially under-investing in acquisition |
◆ Step-by-Step
How to Use the LTV/CAC Calculator
01
Enter ARPA (Average Revenue Per Account)
Your average monthly recurring revenue per customer.
02
Enter Gross Margin
Your revenue minus the direct cost of delivering the service (typically 70–85% for SaaS).
03
Enter Monthly Churn Rate
The percentage of customers who cancel each month (link to Churn Rate Calculator above).
04
Enter Total Monthly S&M Spend
Your total monthly spend on sales and marketing combined.
05
Enter New Customers Acquired
The number of new customers acquired in the same period as your S&M spend.
06
Review Results
The calculator outputs: LTV, CAC, LTV:CAC Ratio, CAC Payback Period (months), and a verdict on your unit economics health.
◆ Cash Flow Lens
CAC Payback Period: How Long to Recoup Acquisition Costs
An equally important metric is the CAC Payback Period — how many months it takes to recoup the cost of acquiring a customer from that customer's gross margin contribution.
◆ CAC Payback Period Formula ◆
CAC Payback Period = CAC ÷ (ARPA x Gross Margin %)
If CAC = $500, ARPA = $99, Gross Margin = 80%:
Payback Period = $500 ÷ ($99 × 0.80) = 500 ÷ 79.20 = 6.3 months
Benchmarks:
Under 12 months Healthy for most SaaS businesses
12–18 months Acceptable for well-funded companies
Over 18 months Cash flow strain without strong financing
◆ For Affiliate Marketers
Why LTV:CAC Matters for Affiliate Marketers
If you promote SaaS tools, understanding LTV:CAC makes you a better affiliate marketer:
🎯
Better program selection
Programs with strong LTV (high-retention SaaS) can afford to pay higher commissions. Find those programs.
✍️
Content positioning
“This tool has a 3x LTV:CAC ratio” is more compelling than generic praise in reviews.
🧮
Your own affiliate business
Treat each piece of content as a customer acquisition channel. What's your CAC for producing an article vs. the LTV of the affiliate commissions it generates?
◆ Ratio Scale
Where Does Your SaaS Land?
Below 1:1
Good
1:1 – 2:1
Marginal
3:1
Healthy
4:1 – 5:1
Very Strong
Above 5:1
Under-Investing
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◆ Frequently Asked
Questions, Answered Honestly.
Know your ratio. Fix your funnel.
Scale with confidence.
LTV:CAC is the single most important ratio in SaaS unit economics. A 3:1 ratio is healthy — below that, you're overspending on acquisition or underperforming on retention.
