What does runway mean in business?
Runway is the length of time a company can keep operating before it runs out of cash, assuming its current spending and income stay roughly the same. It is usually expressed in months. The name comes from aviation: a plane needs enough runway to take off, and a company needs enough time to reach a milestone, such as profitability or its next funding round.
The term is most common with start-ups and other businesses that spend more than they earn, but any business can calculate it. “Financial runway” means the same thing.
How to calculate runway
The basic formula is:
Runway (months) = cash on hand / monthly net burn rate
- Cash on hand is the money the business has available, such as bank balances.
- Burn rate is how fast cash is being spent. Net burn is monthly cash going out minus monthly cash coming in. Gross burn counts only the money going out.
Worked example
Suppose a company has 300,000 in the bank. It spends 80,000 a month and brings in 20,000 a month in revenue. Net burn is 60,000 a month. Runway is 300,000 divided by 60,000, which is 5 months.
If the same company cut spending by 10,000 a month, net burn would fall to 50,000 and runway would extend to 6 months.
What affects runway
- Spending. Salaries, rent, software, and marketing all increase burn.
- Revenue. Growing sales reduce net burn, while falling sales increase it.
- Cash raised. Investment or loans add to cash on hand.
- Payment timing. Late customer payments can shorten runway even when sales look healthy.
- Planned changes. New hires or a product launch can change burn quickly, so a forward-looking forecast is more reliable than a simple average of the past.
Because burn rarely stays flat, many founders recalculate runway regularly and test a few scenarios, such as slower sales or higher costs. Spelling out the assumptions behind each scenario makes it easier to review.
How much runway is enough?
There is no universal answer. Some advice for start-ups suggests keeping a year or more, and some suggests starting a fundraising process well before runway gets short, since raising money often takes longer than expected. Treat these as rules of thumb. The right amount depends on the industry, how predictable revenue is, and how easily the company could raise money or cut costs.
Ways to extend runway
- Reduce non-essential spending.
- Increase revenue or improve collection of customer payments.
- Negotiate longer payment terms with suppliers.
- Raise additional funding.
- Focus on the activities most tied to key business drivers rather than spreading effort thin.
Runway and growth
Fast expansion usually raises burn before it raises revenue, which is one reason runway matters during growing pains. Checking whether each new customer is profitable, using the measures in how to measure the scalability of a business, helps show whether growth will shorten or lengthen runway over time.
Other meanings of runway
Outside finance, “runway” can mean an airport strip or a fashion catwalk. Runway is also the name of a company, and a question about its valuation refers to that company and not to this business concept. In a business context, the cash-based meaning above is almost always what is intended.
Key takeaways
- Runway is how many months a business can operate before cash runs out.
- The basic formula is cash on hand divided by net monthly burn.
- Runway changes as spending, revenue, and funding change, so it should be updated often.
- It is a planning tool rather than a precise prediction.