
How many months of runway should a startup have as cash in bank?
Would help decide whether to spend the money on growth/expansion or keeping it safe for uncertain times.
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Depends on where they are on their revenue ramp.
Too many variables to have a simple radio button answer.

Let's say 1-5 years. Can also share 5-10, 10-20 and 20+ years old if you like.

Companies > 10 years should stop calling themselves startups. Maybe even earlier.
What matters is a plan for efficient capital allocation. Very few startups understand this and even fewer will get this right. "What will you do with the money?"
In the 0-1 stage, you may need 24 months at best primarily because you need to sink $ in product development. People cost is lower and concentrated. The bet is made but the wheel is still spinning.
In 1-10, this changes to building foundations to distributions and scale. So maybe a similar runway as 1-10 but higher $ value in absolute terms. This is also why people raise their A rounds at this time. By the time you get near 10, you know whether your business model has the legs for scale or your org will wallow in mediocrity for the rest of its existence. Pivot khujli sets in as course corrections are essential.
10-100 if you don't have a tight visibility & control on your cash conversion cycles, you're raising further rounds and diluting equity to throw good money after bad. The centrifugal force of your cash cycles will either make you go faster or spin and throw you out, mostly the latter. It is nearly impossible to rectify fundamental flaws in your financials now. You should not need to raise further in the short term unless your markets are multi billion $ TAMs and distribution is a BIG and expensive problem to solve. Multi year heavy burn is possible in some cases (eg Amazon).
While raising capital via equity dilution is popular, if the cash conversion and margins are controlled, leveraging your P&L raising debt capital is a distinct possibility. The rare Indian startup has been able to do this and conserve equity. This voids the runway question - debt is available anytime if you have a strong high margin P&L.

Early stage startups : 15-24 months.
Growth stage need higher runway due to more funding difficultly
