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The 5 SaaS Metrics Every Founder Needs to Understand
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By Derek Giordano, BA Business Marketing · January 2026 · Reviewed for accuracy
SaaS businesses live and die by a handful of metrics. Get these right and you have a scalable, fundable business. Get them wrong — or worse, not measure them at all — and you can be growing revenue while slowly becoming insolvent.
MRR and ARR
Monthly Recurring Revenue (MRR) is the normalized monthly revenue from all active subscriptions. If you have 500 customers paying $49/month, your MRR is $24,500. ARR (Annual Recurring Revenue) is MRR × 12 = $294,000.
Always use MRR for operational tracking (it's more granular) and ARR for fundraising conversations (it's the standard VC metric). Never include one-time fees, setup fees, or professional services revenue in MRR/ARR — these distort the recurring picture.
Churn Rate
Monthly churn rate = Customers lost in a month ÷ Customers at start of month. A 2% monthly churn rate seems small but means you're losing 22% of your customers annually — the equivalent of replacing nearly a quarter of your customer base every year just to stay flat.
Benchmark: below 2% monthly churn is good, below 1% is excellent, above 3% is a product/market fit or customer success problem that will eventually prevent growth.
Track both logo churn (number of customers lost) and revenue churn (MRR lost). If large customers churn at lower rates than small customers, revenue churn will be lower than logo churn — a healthier pattern.
Customer Lifetime Value (LTV)
LTV = Average Revenue Per User (ARPU) ÷ Monthly Churn Rate
At $49/month ARPU and 2% monthly churn: LTV = $49 ÷ 0.02 = $2,450. At 1% churn: LTV = $4,900. This illustrates why reducing churn has such dramatic LTV impact — cutting churn in half doubles LTV.
Customer Acquisition Cost (CAC)
CAC = Total sales & marketing spend ÷ New customers acquired. Include all costs: ad spend, salaries of sales and marketing staff, software, agency fees.
CAC payback period = CAC ÷ ARPU. If CAC is $300 and ARPU is $49, payback is 6.1 months.
The LTV:CAC Ratio
This is the single most important health metric for a SaaS business. LTV:CAC of 3:1 or higher is generally considered healthy. Below 1:1 means you're losing money on every customer acquired. 5:1+ suggests you may be underinvesting in growth.
Investors typically want to see a 3:1+ ratio to believe the business model is fundamentally sound.
Calculate all of these metrics instantly with the SaaS Metrics Calculator.
Frequently Asked Questions
What are the 5 most important SaaS metrics?
The five critical metrics are: Monthly Recurring Revenue (MRR) for tracking predictable income, Customer Acquisition Cost (CAC) for measuring sales efficiency, Customer Lifetime Value (LTV) for long-term revenue prediction, Churn Rate for retention health, and LTV:CAC ratio for overall business viability. A healthy SaaS business typically shows LTV:CAC above 3:1 and monthly churn below 2%. Use the
Churn Rate Calculator to track retention.
What is a good LTV to CAC ratio for a SaaS company?
An LTV:CAC ratio of 3:1 or higher is generally considered healthy, meaning you earn 3 dollars for every 1 dollar spent acquiring a customer. Below 1:1 means you are losing money on every customer. Between 1:1 and 3:1, the business model works but may not support aggressive growth. Above 5:1 may indicate you are underinvesting in growth and leaving market share on the table. Calculate yours with the
LTV Calculator.
How do I calculate Monthly Recurring Revenue (MRR)?
MRR equals the sum of all active subscription revenue normalized to a monthly figure. Annual plans are divided by 12. Include upgrades (expansion MRR), downgrades (contraction MRR), and cancellations (churned MRR). Net New MRR = New MRR + Expansion MRR - Churned MRR - Contraction MRR. Track each component separately to understand what is driving growth or decline.
What monthly churn rate should a SaaS company target?
For B2B SaaS, best-in-class monthly churn is under 1% (under 12% annually). Acceptable is 2-3% monthly for early-stage companies. Above 5% monthly signals a serious product-market fit or customer success problem. B2C SaaS typically runs higher churn (3-7% monthly) due to lower switching costs. Net revenue retention above 100% (expansion revenue exceeds churned revenue) is the gold standard.
When should a SaaS startup start tracking unit economics?
Start tracking CAC, LTV, and churn from the moment you have 20-30 paying customers. Before that, sample sizes are too small for meaningful ratios. However, begin recording the raw data (acquisition costs, revenue per customer, cancellation dates) from day one so you can calculate accurate metrics once you reach sufficient scale. Investors will expect these numbers by the time you raise a Series A.
Ready to run your own numbers? Use the free SaaS Metrics Calculator — no signup required.