The length of time a company can continue operating before it runs out of cash, given its current burn rate.

How is runway calculated?

Runway = cash on hand ÷ net monthly burn rate (cash spent minus cash brought in).

Why does runway matter?

It sets the deadline on every strategic decision and dictates when to raise money, cut costs, or push for revenue.

Growth Marketing Glossary

Runway

run·waynoun

Months of cash left before zero — the clock every startup decision is secretly racing against.

Schematic — cash depleting toward zero

Term: Runway
Part of speech: Noun
Field: Startup finance
Formula: Cash ÷ burn rate

Forms & parts of speech

runway · noun

Months of cash remaining.

"Eighteen months of runway gave them time to find product-market fit."

Definition in plain terms

Runway is how long a company can keep operating before it runs out of money, at its current rate of spending. If a startup has $1.8M in the bank and burns $100k a month, it has 18 months of runway. It's the financial clock — the time available to hit the next milestone before the cash is gone.

The mechanics

Runway = cash on hand ÷ net monthly burn rate (the cash spent minus cash brought in each month). It shrinks as burn rises and extends as revenue grows or costs are cut. Founders track it closely because it determines how long they have to reach the next fundable milestone (product-market fit, a revenue target) before they must raise more money or become profitable. "Default alive" means current trajectory reaches profitability before runway ends.

When it matters

Runway matters most for startups and any cash-burning business: it sets the deadline on every strategic decision and dictates when to raise, cut, or push for revenue. The danger is misjudging it — assuming a raise will come, ignoring how growth spending accelerates burn, or letting runway fall below the ~6 months needed to fundraise from a position of strength rather than desperation.

Worked example. A startup with $1.8M and a $100k monthly burn has 18 months of runway. Planning to fundraise, the founders make sure to start the raise with 6–9 months left — enough to negotiate from strength rather than desperation. A peer that waited until 2 months of runway remained had to take a punishing down round, because investors knew it had no choice.

Failure modes to watch. Assuming a fundraise will land and not planning for it slipping; letting runway drop below the ~6 months needed to raise from strength; ignoring how growth spending accelerates burn; and confusing gross burn with net burn.

Synonyms & antonyms

Synonyms

runwaycash runway

Antonyms

profitabilitypositive cash flow

Usage trends

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Common questions

What is runway?: The length of time a company can continue operating before it runs out of cash, given its current burn rate.
How is runway calculated?: Runway = cash on hand ÷ net monthly burn rate (cash spent minus cash brought in).
Why does runway matter?: It sets the deadline on every strategic decision and dictates when to raise money, cut costs, or push for revenue.

Related tools & calculators

toolCAC payback period calculator

Resources & people to follow

bookFinancial Intelligence — Berman & Knight
referencePaul Graham — "Default Alive or Default Dead?"
thought leadera16z — startup finance

Curated, non-competitor resources verified per term.

Related training

moduleSubscription growth

Disciplines

Areas of marketing where runway is a core concern:

Startup financeUnit economics

Sources

trendsGoogle Trends — "cash runway"