I've sat across from a lot of founders. Smart people. People who can explain their TAM, their NRR, their product roadmap in granular detail. And when I ask them what their real runway is — not the number on the deck, the real one — I get one of two reactions: confident confidence, or quiet panic.
The confident ones worry me more.
Here's the thing nobody tells you at YC or in the Andreessen Horowitz blog posts: burn rate is almost always a lie. Not because founders are dishonest. Because the number they're tracking is a rearview mirror, and they're steering with it.
What "Burn Rate" Actually Means vs. How Founders Use It
Gross burn is total cash out the door per month. Net burn is what's left after revenue. Most founders track net burn. That's fine — but the problem is they calculate it as an average, usually over the last 3 months, and then treat it as gospel.
What they're missing is committed future burn — the obligations that don't show up in last month's numbers but are already locked in. This includes:
Upcoming hiring costs — offers extended, offers accepted. That $140K engineer you just hired? Factor in payroll taxes, benefits, equipment. Real cost is closer to $175K annually.
Vendor contracts with annual true-ups — AWS, Salesforce, and your data providers love burying escalation clauses.
Deferred payroll obligations — commissions earned but not yet paid, PTO accruals, bonuses promised verbally.
Lease obligations — still relevant if you have office space, and it compounds with CAM charges founders forget exist.
Tax liabilities being quietly ignored — payroll tax deposits, sales tax in states you didn't know you have nexus in.
Add those up and your "18 months of runway" might actually be 11. And 11 months is not enough time to close a Series A if you start the process at month 9.
The Metric You Should Actually Be Tracking
Replace "months of runway" with Default Alive Date — the specific calendar date on which, if nothing changes, you run out of operating cash. Not a range. Not "about 14 months." A date.
Put it somewhere you see it every day. It should make you slightly uncomfortable. That discomfort is the point.
Then build a simple 13-week cash flow forecast. Not a model. Not a scenario analysis. A week-by-week accounting of what cash comes in and what cash goes out, for the next 91 days. Update it every Monday morning. This single discipline has saved more companies than any pitch deck framework.
The 3-Number Dashboard every founder should have:
Default Alive Date — the exact date you're out of cash at current trajectory
Committed Burn — what you owe regardless of decisions made today
Break-even Revenue — the monthly MRR at which net burn hits zero
The Conversation Nobody Wants to Have With Their Accountant
The moment founders usually call me is month 3 of "let's extend runway by cutting costs." By then, the best people have already been laid off or have left, the product roadmap has been quietly gutted, and the cuts needed to actually survive are ones they aren't willing to make.
The conversation you want to have is 6 months earlier, when you still have options. That conversation starts with: "Show me every committed dollar leaving this company for the next 12 months, regardless of what revenue does."
Most founders have never seen that number clearly. When they do, they make better decisions — on hiring timing, on contract lengths, on when to start the next raise.
The Bottom Line
Your burn rate is a lagging indicator dressed up as a forward-looking one. The number that actually matters is committed future cash out — and most startups have never calculated it cleanly.
This week: open a spreadsheet and list every financial obligation you've already committed to for the next 12 months. Not projections. Commitments. Add it up. Compare it to your current cash position. That gap is your real story.
If that number surprises you, it was always there. You just hadn't looked.
— Clark Lombardy The Unaudited
Tools and templates from The Unaudited → theunaudited.gumroad.com