FOUNDER MATH 2030
10 terms every founder must know. Cash is the final killer.
Key figures
Cause of death: Of 431 venture-backed startups that shut down since 2023, 70% ran out of capital; 43% never found product-market fit; 29% suffered from bad timing; 19% had broken unit economics.
Reasons overlap.
Causes were identified for 385 companies.
Money did not save them: The 431 startups raised $17.5 billion in equity, with median funding of $11 million per company.
Median time from their last funding round to shutdown: 22 months.
SaaS benchmarks: Lifetime customer gross profit at least 3 times customer acquisition cost (CAC).
Target CAC payback: under 12 months.
Benchmarks, not universal laws.
ARPU, my 1998 experience: I managed monthly revenue per user for cable internet and ADSL customers on 12-month contracts.
Pricing and reporting were fundamental to running the business.
Founders raise money in a language most of them never learned. Investors speak it fluently. That gap kills companies.
Math Man is a job title, not a gender. Math women, math they/them, math whoever you are: cash runs out at the same speed for everyone.
The tape, CB Insights, March 5, 2026: 431 venture-backed startups that shut down since 2023. 70% ran out of capital. That is where the story ends. 43% never found product-market fit, 29% picked the wrong moment, 19% had unit economics that never worked. That is where it starts. Between them, they raised $17.5 billion and died a median 22 months after their last funding round.
The 10 terms.
1. Product-market fit: Customers buy, return, and recommend your product. No fit, no company.
2. Burn rate and runway: Burn is the cash you lose each month. Runway is cash in the bank divided by monthly net burn. Months left to live.
3. Unit economics: Does 1 customer bring in more profit than it costs to win and serve? If not, growth makes it worse.
4. CAC: Sales and marketing spend divided by new customers won.
5. LTV: The estimated lifetime gross profit from 1 customer. SaaS target: at least 3 times CAC. Below 1:1, winning the customer costs more than the customer is expected to bring in.
6. CAC payback: Months of customer gross profit needed to earn back what you spent to win them. Under 12 is a common SaaS benchmark, not a law of nature.
7. ARPU: Average revenue per user, usually per month. I ran this metric in my telco reporting in 1998, cable internet and ADSL customers on 12-month contracts.
8. ARR: Recurring revenue from subscriptions and contracts, counted per year. A good month times 12 is a hope, not a number.
9. Churn: The share of customers or recurring revenue you lose in a period. Net revenue retention tracks recurring revenue from existing customers after expansion, contraction, and churn.
10. Gross margin: Revenue left after the direct cost of delivering your product or service, as a percentage. Negative margin? Fix it before you scale.
My 2030 line: AI agents will automate startup financial reporting, from burn rate to customer economics. They will not rescue a founder who cannot read the numbers. The dashboards get smarter. The excuses get dumber.
