Most SaaS metrics guides are written for Series B companies with data teams, analytics engineers, and dashboard budgets. If you're a solo founder at $0–$10K MRR, that advice is actively harmful — it sends you down a rabbit hole of dashboards and cohort analyses when you should be talking to customers and shipping features.
Here's what actually matters when it's just you.
tl;dr
Track five metrics: MRR, churn rate, CAC, LTV, and runway. Review them monthly. Ignore everything else until you pass $10K MRR. The time you'd spend building a fancy metrics dashboard is better spent acquiring your next 10 customers.
The only 5 metrics that matter at early stage
1. MRR — Monthly Recurring Revenue
What it is: The total predictable revenue you collect every month from active subscriptions.
How to calculate:
MRR = Number of paying customers × Average revenue per customer
If you have 50 customers paying $29/month and 10 customers paying $49/month, your MRR is (50 × $29) + (10 × $49) = $1,940.
Why it matters: MRR is the single number that tells you whether your business is growing, shrinking, or stagnant. Everything else is a derivative of this number.
How often to check: Monthly. Don't check daily — it'll make you neurotic about natural fluctuations.
For the full definition and benchmarks, see the MRR glossary entry.
2. Churn rate — How fast you're losing customers
What it is: The percentage of customers who cancel their subscription each month.
How to calculate:
Monthly churn = Customers lost this month / Customers at start of month × 100
If you started the month with 100 customers and 4 cancelled, your monthly churn is 4%.
Why it matters: Churn is the silent killer of solo SaaS businesses. At 5% monthly churn, you need to replace half your customer base every year just to stay flat. At 10%, you're on a treadmill that accelerates faster than you can run.
Benchmarks:
- Under 3% monthly → good, you have product-market fit
- 3–5% monthly → acceptable for early stage, work on retention
- Over 7% monthly → stop acquiring customers and fix retention first
See the churn rate glossary entry for detailed benchmarks by business type.
3. CAC — Customer Acquisition Cost
What it is: How much you spend to acquire one paying customer.
How to calculate:
CAC = Total sales & marketing spend / New customers acquired
If you spent $500 on ads and content this month and got 10 new customers, your CAC is $50.
Why it matters at solo scale: Most solo founders think their CAC is zero because they're doing organic marketing. It's not — your time has a cost. If you spend 20 hours writing blog posts and that produces 5 customers, your CAC is 20 hours of your time. You need to know this number to decide whether paid acquisition is worth trying.
The trap: Don't obsess over CAC in isolation. A $200 CAC is fine if your LTV is $2,000. A $20 CAC is terrible if your LTV is $25.
For more, see the CAC glossary entry.
4. LTV — Lifetime Value
What it is: The total revenue you expect to earn from a customer over their entire relationship with you.
How to calculate (simple version):
LTV = Average revenue per user (ARPU) / Monthly churn rate
At $29/month ARPU and 5% churn, LTV = $29 / 0.05 = $580.
Why it matters: LTV tells you the upper bound of what you can spend to acquire a customer. The classic rule is LTV should be at least 3× CAC. If your LTV is $580, you can afford to spend up to ~$190 to acquire a customer and still have a healthy business.
The reality for solo founders: Your early LTV estimate will be inaccurate because you don't have enough data. That's fine. Use the formula above for rough decisions, then refine as you get 6+ months of churn data.
See the LTV glossary entry.
5. Runway — How long before the money runs out
What it is: The number of months you can keep operating at your current burn rate.
How to calculate:
Runway = Cash in bank / (Monthly expenses - Monthly revenue)
If you have $30,000, spend $4,000/month, and earn $1,500/month in MRR, your runway is $30,000 / ($4,000 - $1,500) = 12 months.
Why it matters: Runway is the meta-metric. It tells you how urgently you need to grow. With 18+ months of runway, you can afford to experiment. With 3 months, every decision is existential.
See the runway glossary entry and burn rate for more context.
Run your own numbers
Plug in your price point, income goal, and expenses to see exactly how many customers you need.
Open revenue calculatorMetrics you should ignore (for now)
These are real metrics that matter at scale. They're also time sinks that distract solo founders.
NPS (Net Promoter Score) — Survey-based sentiment metric. At 50 customers, your sample size is too small for NPS to be statistically meaningful. Just talk to your customers directly.
DAU/MAU ratio — Daily active users divided by monthly active users. This matters for consumer apps and social products. If you're building a B2B SaaS tool, people use it when they need it — a low DAU/MAU ratio might just mean your tool works well and doesn't require daily attention.
Expansion revenue — Revenue growth from existing customers upgrading. Until you have multiple pricing tiers with meaningful adoption, tracking this number returns zero insight.
Cohort analysis — Comparing behavior of customer groups over time. Powerful at 1,000+ customers. Meaningless at 50. One churned customer in a cohort of 8 looks like a 12.5% churn spike but is statistically noise.
Net Revenue Retention — The gold standard metric for mature SaaS. Requires enough customers on enough plan tiers over enough time. You'll get there. Not yet.
The revenue reality check
The metrics above tell you how your business is performing. But the question most solo founders actually have is: how many customers do I need to quit my job?
That's a math problem. If your target income is $100K/year, your price is $29/month, and your tax rate is 25%, you need:
Required MRR = ($100,000 / 12) × (1 / (1 - 0.25)) = ~$11,111/month
Required customers = $11,111 / $29 = ~383 customers
At 5% monthly churn, you need even more to maintain steady state: roughly 480 customers to keep 383 active at any time.
These numbers are sobering. They're also why pricing decisions matter so much — at $49/month instead of $29, you'd need 227 customers instead of 383.
Calculate all your SaaS metrics
Enter your revenue, customers, and costs to get MRR, churn, LTV, CAC, and more — calculated instantly.
Open SaaS metrics calculatorWhen to level up your metrics
Here's the honest progression:
$0–$1K MRR: Track MRR and churn. That's it. Spend all other time on product and acquisition.
$1K–$5K MRR: Add CAC and LTV. Start thinking about whether your unit economics work.
$5K–$10K MRR: Add runway calculation. Start reviewing all five metrics monthly on a fixed schedule.
$10K+ MRR: Now add net revenue retention, expansion revenue, and cohort analysis. You have enough data for these to be meaningful. Consider a dedicated metrics tool like ChartMogul or Baremetrics.
Free tools to track these
You don't need a paid analytics platform to track 5 metrics.
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Stripe Dashboard — Shows MRR, new customers, churn, and revenue trends out of the box. If you use Stripe for payments, this is your primary metrics source.
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A spreadsheet — Seriously. A simple Google Sheet where you log your 5 metrics on the first of every month. Takes 10 minutes and forces you to actually look at the numbers.
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PostHog — Free up to 1M events/month. Use it for product analytics when you need to understand user behavior beyond revenue metrics.
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Your bank account — For runway, check your actual bank balance minus committed expenses. Don't overcomplicate this.
verdict
Metrics exist to inform decisions, not to make you feel productive. At early stage, five numbers tell you everything you need to know: MRR (are you growing?), churn (are you retaining?), CAC (is acquisition efficient?), LTV (is the math sustainable?), and runway (how much time do you have?). Master these five before adding anything else. The founders who obsess over dashboards at $2K MRR are usually avoiding the harder work of talking to customers and shipping features.
Related resources
- MRR, ARR, Churn rate, CAC, LTV — glossary definitions with benchmarks
- Runway, Burn rate, ARPU — supporting metric definitions
- How to price your SaaS — pricing decisions that directly impact these metrics
- Revenue calculator — model customer requirements at any price point
- SaaS metrics calculator — calculate MRR, churn, LTV, and CAC
- Best analytics tools — category ranking for tracking these metrics
FAQ
What's a good churn rate for a solo SaaS?+
Under 5% monthly (which is ~46% annual) is acceptable for early-stage. Under 3% monthly is good. Under 1% monthly is excellent and typically only achievable with annual plans or high switching costs. If your monthly churn exceeds 7%, focus on retention before growth — you're filling a leaky bucket.
How do I calculate LTV with almost no data?+
Use the simple formula: LTV = ARPU / monthly churn rate. If your average revenue per user is $29/month and your churn is 5%, your LTV is $29 / 0.05 = $580. This is approximate but good enough for early decisions. Refine it as you get 6+ months of data.
Should I track daily or monthly metrics?+
Monthly for almost everything. Daily metrics create anxiety-driven decision making — a bad Tuesday means nothing. The exception is monitoring for outages or payment failures, where daily alerts matter. Review your core metrics once per month, ideally on the same day.
When should I start tracking more metrics?+
When you pass $10K MRR and have at least 6 months of data. At that point, add net revenue retention, expansion revenue, and cohort analysis. Before that threshold, the sample sizes are too small for these metrics to be statistically meaningful.
What tools should I use to track SaaS metrics?+
Start with your payment processor's dashboard — Stripe has built-in MRR, churn, and revenue charts. Add PostHog or a similar tool for product analytics when you need behavioral data. Don't pay for a dedicated metrics tool like ChartMogul or Baremetrics until you're past $5K MRR — the free options are sufficient before that.