Glossary term
Runway
Runway is the amount of time a company can keep operating before it runs out of cash, based on its cash balance and cash burn.
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What Is Runway?
Runway is the amount of time a company can keep operating before it runs out of cash, based on its cash balance and cash burn. The term is common in startups, venture-backed companies, and small businesses that are spending more cash than they bring in.
Runway is usually expressed in months. A company with $1 million of cash and a net cash burn of $100,000 per month has about 10 months of runway, assuming the burn rate does not change.
Key Takeaways
- Runway measures how long a company can operate before cash is exhausted.
- It depends on both cash on hand and the rate at which cash is being spent.
- Revenue growth, cost cuts, financing, collections, and delayed spending can extend runway.
- Hiring, customer acquisition, inventory, debt payments, and slow collections can shorten it.
- Runway is a planning metric, not a guarantee, because cash inflows and outflows can change quickly.
How Runway Is Calculated
A simple runway estimate divides available cash by monthly net cash burn.
Cash balance is the money available to fund operations. Monthly net cash burn is the amount of cash the company uses each month after considering cash inflows and outflows. If the company is cash-flow positive, the idea of runway changes because the business is no longer using cash in the same way.
Runway Drivers
Driver | How It Affects Runway |
|---|---|
Higher monthly burn | Shortens runway unless cash increases |
New financing | Extends runway, but may dilute owners or add debt |
Revenue growth | Can extend runway if collections are timely |
Cost reductions | Can extend runway by lowering monthly burn |
Slow receivables | Can shorten runway even when sales look strong |
What Founders and Investors Watch
Runway shapes hiring, product timing, fundraising, vendor commitments, and strategic options. A company with 18 months of runway may have time to test growth plans. A company with three months of runway may need immediate financing, expense cuts, or a sale process.
The best runway analysis uses scenarios. A base case may assume current burn continues, while a downside case may assume slower revenue, delayed funding, or higher costs. That helps decision-makers see how quickly flexibility can disappear.
Cash Planning Context
Runway should be reviewed with accounts receivable, committed expenses, debt payments, inventory needs, and expected fundraising timing. A company can have a healthy accounting pipeline and still face runway pressure if cash collections lag.
The Bottom Line
Runway estimates how long a company can keep operating with its current cash and burn rate. It is one of the clearest cash-planning metrics for startups and small businesses because it turns liquidity into time.