The 7 SaaS Metrics That Actually Matter (CAC, LTV, Churn & More)

⚠️

Stop Tracking Vanity Metrics

Total signups, page views, social followers — these numbers feel good but tell you nothing about the health of your business. The metrics that matter are the ones that predict whether you'll be alive in 12 months.

📊 The 7 Essential SaaS Metrics at a Glance

Metric	Formula	Target
MRR	Customers × Avg Revenue	Growing month-over-month
CAC	(Marketing + Sales) ÷ New Customers	Recoverable in <12 months
LTV	Avg Revenue ÷ Monthly Churn	3× your CAC or more
LTV:CAC	LTV ÷ CAC	3:1 (healthy), 5:1+ (under-investing)
Monthly Churn	Lost ÷ Starting Customers	<2% SMB, <1% Enterprise
Gross Margin	(Revenue − COGS) ÷ Revenue	70-85%
CAC Payback	CAC ÷ (Monthly Rev × Margin)	<12 months

📈 Deep Dive: Each Metric Explained

1. Monthly Recurring Revenue (MRR)

MRR = Total paying customers × Average revenue per customer

The heartbeat of your SaaS. Track new MRR (new customers), expansion MRR (upgrades), churned MRR (cancellations), and net new MRR (the sum).

2. Customer Acquisition Cost (CAC)

CAC = (Marketing spend + Sales spend) ÷ New customers acquired

💡

Benchmark

Your CAC should be recoverable within 12 months. If it takes 18+ months to recover CAC, you're burning cash.

3. Customer Lifetime Value (LTV)

LTV = Average revenue per customer ÷ Monthly churn rate

At $50/mo MRR and 3% monthly churn: LTV = $50 ÷ 0.03 = $1,667

4. LTV:CAC Ratio

The golden ratio of SaaS economics.

<1:1

Losing money per customer 🔴

3:1

Healthy & sustainable 🟢

5:1+

Under-investing in growth 🟡

5. Monthly Churn Rate

Churn = Customers lost ÷ Customers at start of month

⚠️

Churn Compounds Fast

A seemingly harmless 5% monthly churn means you lose 46% of customers per year. Benchmarks: <2% monthly for SMB SaaS, <1% for enterprise.

6. Gross Margin

Gross Margin = (Revenue − COGS) ÷ Revenue

COGS for SaaS includes hosting, support, and third-party APIs. Target: 70-85%. Below 60% and you have a cost structure problem.

7. CAC Payback Period

Payback = CAC ÷ (Monthly revenue per customer × Gross margin)

✅

Target: Under 12 Months

Under 6 months is excellent. If you're above 18 months, your unit economics need work.

🎯 Key Takeaways

Track MRR, CAC, LTV, LTV:CAC, Churn, Gross Margin, and CAC Payback
LTV:CAC of 3:1 is the golden ratio for sustainable growth
Monthly churn above 3% will kill your business — fix it first
Gross margin below 60% means a cost structure problem
Recover CAC within 12 months or you're burning cash