Series A Metrics

"What metrics are you tracking?" It is a question every investor will ask—and your answer reveals a lot about how well you understand your business. Yet many founders either track too many metrics or focus on the wrong ones.

The truth is, not all metrics are created equal. Some numbers matter more at different stages. Some metrics that investors obsess over might not be relevant to your business model. And some of the most important KPIs rarely appear in investor decks but are essential for day-to-day decision making.

This guide covers the metrics that matter most for Series A: what they mean, how to calculate them, and what benchmarks to target.

Revenue is the foundation of any business. At Series A, investors want to see meaningful revenue with strong growth trajectory.

Annual Recurring Revenue (ARR): The total annualized value of your recurring revenue contracts. For SaaS companies, this is MRR multiplied by 12. At Series A, most companies have $1-5M ARR.

Monthly Recurring Revenue (MRR): The predictable revenue you expect each month. Include all recurring subscription revenue, excluding one-time fees and professional services.

Year-over-Year Growth: Your revenue growth compared to the same period last year. Series A investors typically look for 100%+ YoY growth, though this varies by business model and stage.

Monthly Growth Rate: Month-over-month revenue growth. Most investors expect 10-20% monthly growth at Series A stage, though again, this varies.

Unit economics show the economics of acquiring and serving a single customer. These metrics determine whether your business can scale profitably.

Customer Acquisition Cost (CAC): The total cost of acquiring a new customer, including all sales and marketing expenses divided by the number of customers acquired. CAC = Total Sales & Marketing Spend ÷ New Customers Acquired.

Customer Lifetime Value (LTV): The total revenue you expect to earn from a customer over their entire relationship. For subscription businesses: LTV = Average Revenue per Customer ÷ Monthly Churn Rate.

LTV:CAC Ratio: The ratio of customer lifetime value to acquisition cost. A ratio of 3:1 or higher is considered healthy. This means you earn $3 for every $1 spent acquiring customers.

Payback Period: The time it takes to earn back the cost of acquiring a customer. Shorter is better. Most healthy SaaS companies have payback periods of 12-18 months.

Retention metrics show how well you are keeping customers. Strong retention is evidence of product-market fit.

Gross Revenue Retention (GRR): The percentage of recurring revenue retained from existing customers, excluding expansion. GRR measures your ability to keep customers, not grow them. A GRR above 90% is strong.

Net Revenue Retention (NRR): The percentage of recurring revenue retained plus expansion revenue from existing customers. NRR above 100% means you are growing revenue from your existing customer base. NRR of 110-120%+ is excellent for SaaS.

Customer Churn Rate: The percentage of customers who cancel their subscription in a given period. Monthly churn of 2-3% is typical; below 2% is excellent.

Revenue Churn Rate: The percentage of recurring revenue lost from cancelled customers plus downgrades. More accurate than customer churn for understanding financial impact.

Efficiency metrics show how efficiently you are growing and using capital.

Magic Number: A SaaS efficiency metric that measures revenue generation efficiency. Magic Number = (Current Quarter ARR - Prior Quarter ARR) ÷ Prior Quarter Sales & Marketing Spend. A magic number above 1.0 is efficient.

Rule of 40: A measure of growth plus profit. Rule of 40 = Growth Rate % + Profit Margin %. Companies above 40 are balancing growth and profitability well. Below 20 is concerning.

Burn Rate: The rate at which you spend cash. Gross burn is total expenses; net burn is expenses minus revenue. Investors want to see manageable burn relative to growth.

Runway: The number of months you can operate before running out of cash. Runway = Cash Balance ÷ Monthly Net Burn. Most investors want to see 18-24 months post-raise.

Margins show the profitability of your business at different levels.

Gross Margin: Revenue minus cost of goods sold, divided by revenue. For SaaS, gross margins of 70-80% are typical. Below 60% may signal issues with your cost structure.

Contribution Margin: Revenue minus variable costs (costs that scale with revenue). Shows the unit economics of each customer.

Operating Margin: Revenue minus all operating expenses. Shows overall profitability before interest and taxes.

Net Revenue Retention: Already covered above, but worth noting that NRR above 100% is essentially "negative gross margin" on existing customers—you make more from them over time than you started with.

Different stages prioritize different metrics. Understanding what matters at Series A helps focus your efforts.

Pre-Seed to Seed: Focus on product development, early customer feedback, and initial traction metrics. Revenue may be minimal.

Series A: Focus on demonstrating product-market fit through retention, establishing repeatable customer acquisition, and showing efficient growth. ARR typically $1-5M.

Series B+: Focus on scaling what works, efficiency metrics, and path to profitability. ARR typically $10M+.

Remember: metrics should tell a story. Each number should connect to the others and support your investment thesis.