Startup Runway: A Founder''s Guide to Planning, Extending, and Never Being Surprised by the Cash-Out Date
The single most common failure mode in startups is not building the wrong product. It is running out of cash while still building the right one. And running out of cash is almost always foreseeable six months in advance — and almost always ignored until three months out, when the options collapse.
This is the discipline that keeps the cash-out date on the wall, visible, every week.
The rule most experienced founders live by: raise enough to run for 18 months at the burn you plan to have six months from now.
Two parts, both matter. 18 months is the minimum window that lets you miss the plan by six months and still fundraise from a position of strength. Anything shorter means the next raise is a forced sale of the story.
Burn six months from now, not today''s burn. Every early-stage startup underestimates future burn because hires get added, cloud bills grow, and marketing scales into the plan. Model it forward.
For a Seed round, the number often lands at $2–4M for a small team. For a Series A, $12–18M. Bigger than that, and dilution outweighs the safety.
The single number to know: burn multiple = net cash burned ÷ net new ARR, calculated monthly and looked at as a trailing 3-month average.
Under 1.0 — outstanding. Every dollar burned is generating more than a dollar of new ARR. 1.0–1.5 — good. Standard for a well-run early Series A. 1.5–2.0 — acceptable for early stage, watch carefully. 2.0–3.0 — problem. Either efficiency needs to improve or the plan is over-invested for the stage.
Above 3.0 — burn crisis. Either fix within one quarter or start planning a bridge.
The burn multiple is more useful than the raw burn number because it normalizes for growth. A $500K/month burn is fine at $200K/month net new ARR. It is a crisis at $80K/month net new ARR.
Base case. The plan you actually believe. New hires as planned. Growth continues at the trailing rate. No surprises.
Downside…
R…
