How burn rate and runway differ, why investors care about both, and the specific numbers that signal 'safe to fund' vs 'raising from weakness.'.
Burn rate and runway measure the same reality from different sides. Investors look at both in every meeting. Founders who talk about one without the other signal they don't manage the business by the numbers.
Gross burn: total monthly cash out (salaries, rent, tools, hosting). Net burn: gross burn minus monthly revenue. Investors care most about net burn — gross burn without context misleads companies with meaningful revenue.
Cash in the bank divided by net burn. 12 months is comfortable. 6 months is fundraising urgency. Under 3 months is distress — you'll take unfavorable terms because you have no leverage.
Raise enough to hit the next milestone plus 6 months of buffer. If Series A takes 12 months of milestone work, raise 18 months of runway. Founders who raise exactly what they need land in fundraising mode with 3 months left, which is 'raising from weakness.'
12 months of runway remaining. This gives 6–8 weeks of prep, 6–8 weeks of active fundraising, and buffer for delays. Starting at 6 months of runway forces bad decisions; starting at 18 months signals you don't need the money (which is actually the best position).
Net burn ÷ net new ARR added. Under 1× is world-class. 1–2× is healthy at Series A. 2–3× is acceptable at Series B. Above 3× is a red flag — you're consuming more cash than you're generating value. Growth-at-any-cost is out; efficient growth is what gets funded.
Don't ramp burn just before raising. Investors read the last 3 months of P&L — if hiring spiked in Q1 and you're raising in Q2, they extrapolate the new burn forward and reduce the valuation. Prove capital efficiency before you ask for more capital.
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