Unit economics — the revenue and cost associated with a single customer — evolve dramatically as a company scales. Understanding what "good" looks like at each stage prevents premature scaling and helps founders make better capital allocation decisions.
What Are Unit Economics?
The direct revenues and costs associated with a single unit of business — typically a single customer.
Key metrics: CAC, LTV, Gross Margin, Payback Period, NRR
Stage 1: Pre-Product-Market Fit (0–$500K ARR)
Unit economics are often negative or undefined — acceptable at this stage.
Focus: Finding the ICP, validating willingness to pay, understanding churn drivers.
Acceptable metrics: High and variable CAC, high churn, potentially negative gross margin
Key question: Are there any customers who love the product enough to pay and stay?
Stage 2: Early Traction ($500K–$3M ARR)
PMF is emerging. Unit economics should be improving but not yet optimized.
Target metrics: Gross margin 50%+, monthly churn < 5%, CAC payback less than 24 months, LTV:CAC greater than 1.5:1
Focus: Identifying the repeatable sales motion, reducing churn, improving gross margins
Stage 3: Growth ($3M–$20M ARR)
The sales motion is repeatable. Unit economics should be healthy and improving.
Target metrics: Gross margin 70%+, monthly churn < 2%, NRR > 100%, CAC payback less than 18 months, LTV:CAC greater than 3:1
Focus: Scaling the sales team, expanding into new segments, optimizing the funnel
Stage 4: Scale ($20M–$100M ARR)
Unit economics are strong. Focus shifts to efficiency and market share.
Target metrics: Gross margin 75%+, NRR > 110%, CAC payback less than 12 months, LTV:CAC greater than 5:1, Rule of 40 greater than 40
Focus: Operational efficiency, international expansion, product expansion
The Rule of 40
Revenue growth rate + EBITDA margin > 40%
Example: 60% growth + (-20%) EBITDA margin = 40 — acceptable
Example: 20% growth + 15% EBITDA margin = 35 — below benchmark
Key Takeaways
- Unit economics evolve dramatically across growth stages — benchmarks differ at each stage.
- Pre-PMF: focus on learning, not efficiency.
- Growth stage: target LTV:CAC greater than 3:1, NRR greater than 100%, gross margin greater than 70%.
- Scale stage: target Rule of 40 greater than 40, NRR greater than 110%, CAC payback less than 12 months.
- Premature scaling before unit economics are healthy destroys value.