You're running a seed-stage startup, and you have limited resources, even more limited time, and an infinite number of metrics you could be tracking. Every day brings new data: user signups, churn rates, support tickets, feature adoption, email open rates. The question isn't whether there's data available—it's which metrics actually matter for your stage and your goals.
At Good Combinator, we've worked with hundreds of early-stage companies. We've seen founders obsess over vanity metrics (total users registered) while ignoring the metrics that predict success (retention and revenue). We've watched companies raise funding based on impressive unit economics before realizing they don't have a sustainable customer acquisition channel.
Over time, we've identified five metrics that consistently matter at the seed stage. These aren't metrics for later—when you're Series B with 50 employees and complex unit economics. These are the five KPIs that investors actually scrutinize, that should shape your product decisions, and that are strong leading indicators of whether you'll eventually build something substantial.
1. Monthly Burn Rate & Runway
Let's start with the most fundamental metric: how long can you operate before you run out of money? This is not sexy, but it's the heartbeat of early-stage operations.
How to calculate it: Monthly burn rate is your monthly operating expenses minus any revenue you're generating. If you raise $500,000 and spend $25,000 per month, your monthly burn is $25,000. Your runway is simply your remaining cash divided by your burn rate—in this case, 20 months.
The calculation is straightforward, but the implications are profound. Your runway is the clock on your opportunity to reach certain milestones: product-market fit, revenue, traction, or the next funding event. Seed-stage investors want to see 12-18 months of runway at your current burn rate. Why? Because in that timeframe, you should be able to demonstrate meaningful progress: proof of customer demand, repeatable revenue, or dramatically improved unit economics.
What investors want to see: They want to see that you're being disciplined with capital and that you understand your own unit economics well enough to manage your burn. They also want to see that you have a clear plan for what milestones you'll hit before you need to fundraise again. Don't go into a seed round claiming 24 months of runway only because you haven't spent money yet. Be realistic about the pace at which you'll need to hire, market, and iterate.
Red flag: If your burn rate is accelerating month-over-month without proportional progress on your core metrics, that's a warning sign. You're spending more to get less traction. Either your unit economics are poor, or your growth initiatives aren't working. Fix this before your runway disappears.
2. MRR / Revenue Growth Rate
Even at the seed stage, revenue matters. Not all startups have revenue yet, but the ones that do have a significant advantage when fundraising, and more importantly, they have a real test of whether customers actually value their product.
How to track it: Monthly Recurring Revenue (MRR) is the total amount you can predict to receive each month from all active customers who are on monthly plans. If you have 10 customers paying $500/month on subscriptions, your MRR is $5,000. If you also have annual contracts, calculate the monthly equivalent (a $12,000 annual contract = $1,000 MRR).
MRR is valuable because it's predictable. It's not just the sum of all invoices you sent out last month—it's the revenue that should recur the following month unless customers churn. Investors love MRR because it's both a proof point (people are willing to pay) and a leading indicator (growing MRR month-over-month suggests you're finding repeatable demand).
What's a healthy growth rate? At the seed stage, if you have revenue, aim for 10-20% month-over-month growth (some high-growth SaaS companies achieve 30-50%, but that's exceptional). The key metric is your growth rate, not your absolute MRR. If you have $2,000 MRR growing at 15% per month, you'll reach $50,000+ MRR within a year. That's a trajectory investors want to see.
Cohort-based revenue tracking: Even better than overall MRR growth is understanding your revenue by customer cohort. When did you acquire each customer, and what's their lifetime value? Customers acquired in January 2026 should have different retention and expansion patterns than those acquired in March. By tracking cohorts, you'll spot problems early (e.g., "customers from our March launch campaign are churning twice as fast as our January cohort") and identify your best acquisition channels.
3. Customer Acquisition Cost (CAC)
You have MRR. Now the question is: how much are you spending to acquire that revenue? This is where Customer Acquisition Cost comes in, and it's one of the most misunderstood metrics in early-stage startups.
How to calculate true CAC: Don't just divide your marketing spend by new customers acquired. That's incomplete. True CAC includes not just advertising spend, but all costs associated with acquisition: salaries for your sales team, marketing platform subscriptions, events, travel, content creation, tools—everything that goes into bringing in a new customer.
Let's say you spent $5,000 on ads, $2,000 on a sales person's time (pro-rated), and $1,000 on a trade show in a month, and you acquired 10 new customers. Your CAC is ($5,000 + $2,000 + $1,000) / 10 = $800 per customer.
CAC payback period: Now that you know your CAC, the next crucial question is: how long does it take for a customer to pay back that acquisition cost? If your CAC is $800 and your average customer's monthly profit (MRR minus the cost of serving them) is $200, your CAC payback period is 4 months. This is critical information.
Seed-stage investors want to see a CAC payback period under 12 months. Why? Because if it takes you longer than 12 months to recover the cost of acquiring a customer, you'll run out of runway before you can scale profitably. A 4-month payback period is excellent and means you can scale faster without running out of money.
Common pitfall: Many founders forget to include team salaries in their CAC calculation because those are "fixed costs." But they're not fixed if you're hiring to build your sales team. Account for them. And be honest about which percentage of your time as a founder is going toward customer acquisition versus product development.
4. Cohort Retention Rate
You've acquired customers. You've grown your MRR. But are your customers staying? This is where retention comes in, and it's often the metric that separates enduring companies from flash-in-the-pan successes.
Why retention matters more than acquisition: A company that grows 50% month-over-month in new customers but loses 40% of existing customers is not actually growing—it's on a treadmill. You're always starting from zero. But a company with more modest 10% new customer growth and 95% retention is compounding. It's building something sustainable.
Investors know this. They've seen the data across thousands of companies. Retention is the metric that predicts long-term success more reliably than almost anything else. That's why cohort retention is so important to track at the seed stage.
How to measure cohort retention: Start by cohort. Segment all customers by when they were acquired. For each cohort, calculate the percentage of them that remained active (paid, logged in, or performed a key action) in each subsequent month.
Example: You acquired 50 customers in January. In February, 45 remained active (90% month-1 retention). In March, 40 remained active (80% month-2 retention). In April, 38 remained active (76% month-3 retention). This is your retention curve for your January cohort.
What's healthy? At the seed stage, if you're B2B SaaS, aim for 90%+ month-over-month retention (meaning 10% or less monthly churn). If you're B2C, you might see slightly higher churn (80-90%), depending on your category. The key is: is your cohort retention stable or improving? If your January cohort has 85% month-1 retention and your February cohort has 80% month-1 retention, something changed—and you need to figure out what.
Retention as a leading indicator: Retention predicts lifetime value, which predicts whether your unit economics work. If you know a customer stays for 20 months with 95% monthly retention and generates $500 in profit, you have a $10,000 lifetime value. If your CAC is $800, you have a healthy 12.5x LTV:CAC ratio. That's the kind of math that scales into a sustainable business.
5. Engagement / Activation Rate
This metric is trickier because it's product-specific. But it's incredibly important as a leading indicator, especially before you have enough revenue and retention history to rely on those metrics.
What is activation? Activation is the moment when a new user realizes value from your product. It's the "aha moment." For Slack, it's sending the first message to your first channel. For Stripe, it's making the first API call. For a project management tool, it's creating the first project and inviting a team member.
The key insight is this: users who experience activation are dramatically more likely to become retained, paying customers. Users who never activate are almost certain to churn. So measuring whether your new users are reaching that activation moment is a leading indicator of your future retention and revenue.
How to define activation for your product: Look at your most loyal customers. What did they do in their first week? What's the common behavior? That's likely your activation event. Now measure: what percentage of new signups reach that activation event within 7 days?
A healthy activation rate at the seed stage is often 30-50%, depending on your product complexity and go-to-market motion. If only 10% of your new users activate, your retention is going to suffer—and you can trace your future churn problem back to this leading indicator today.
Why this matters for fundraising: Seed investors are betting on your team's ability to build a product people want to use. Activation rate is proof that you're on the right track. If 50% of people who try your product experience value in the first week, that's a signal that you've found something real. If it's 5%, that's a signal that you're still searching.
Engagement metrics beyond activation: Depending on your product, you might also track daily or weekly active users (DAU/WAU), feature adoption rates, or session frequency. The key is to choose one or two that truly correlate with long-term retention and revenue in your space. Then track them obsessively.
Putting It All Together
These five metrics don't exist in isolation. They form a connected story that you should be able to tell investors and, more importantly, to yourself.
The story might sound like this: "We have 15 months of runway. We're currently at $8,000 MRR, growing 18% month-over-month. Our CAC is $650 with a 5-month payback period. Our cohort retention is stable at 92% month-over-month, and 45% of new users reach activation within a week. At this growth rate, we'll hit $30,000+ MRR by year-end."
That's a story every investor wants to hear. Why? Because it shows you understand your business deeply. You know how to acquire customers cost-effectively, they stick around, and you're compounding. You have enough time to reach the next milestone. You're not just hoping for growth—you're building it systematically.
If your story is different—maybe your CAC payback is 12 months, or your activation rate is 15%, or your retention is declining—you need to know that. And you need to know what you're going to change to fix it.
The Metric You Shouldn't Track (Yet)
At the seed stage, there's one metric we'd encourage you not to obsess over: profitability. Not because it doesn't matter—it does, eventually. But at this stage, you should be optimizing for growth, retention, and proof of product-market fit. Profitability can come later, when you've found a scalable business model.
Similarly, don't get caught up in vanity metrics like total signups, page views, or email list size. These can obscure what's really happening. A 1,000-person email list where 2% open your emails is less valuable than a 200-person list where 40% engage. Focus on quality and engagement, not volume.
Ready to Turn Data Into Growth?
These five metrics are the foundation of a data-driven early-stage company. But tracking them is only half the battle—using them to make better decisions is where real growth happens.
That's where Good Combinator comes in. Our accelerator team works with founders to establish the right metrics framework, interpret the data, and make decisions that compound over time. If you're building a seed-stage company and want guidance from someone who's seen what works, apply to our next cohort.
Apply to Good Combinator