Runway is the amount of time your business can keep operating before it runs out of cash, assuming nothing changes about your current spending and revenue. The term gets borrowed from the startup world, but the concept matters just as much for a small local business as it does for a venture-backed tech company; it just doesn't get talked about as often outside that world.
The Basic Calculation
Runway is calculated by dividing your current cash on hand by your monthly burn rate, the amount your cash balance decreases each month after accounting for revenue coming in. If you have $30,000 in the bank and you're losing $5,000 a month after revenue, your runway is six months.
That's the whole calculation, but the number is only as useful as the accuracy of your monthly burn rate estimate, which is where a lot of business owners get it wrong.
Why New Businesses Especially Need to Track It
Most new businesses aren't profitable in the first several months, sometimes the first couple of years, which means cash is steadily draining even as the business is doing everything right. Without tracking runway explicitly, it's easy to feel like things are progressing fine right up until the bank account is suddenly, alarmingly low.
Knowing your runway turns a vague sense of "we should be okay for a while" into a specific, trackable number you can actually plan around.
Burn Rate Needs to Include Everything, Not Just the Obvious Costs
A common mistake when calculating burn rate is only counting the big, obvious expenses like rent and payroll while forgetting smaller recurring costs, software subscriptions, insurance premiums, loan payments, and the owner's own living expenses if they're drawing money from the business. All of these reduce your actual runway, whether or not you remembered to include them in your estimate.
Build your burn rate from a real look at your bank statements over the last few months, not a mental list of expenses you remember off the top of your head.
Runway Isn't Fixed, It's a Moving Target
As revenue grows or costs change, your runway changes with it, which means it's not something you calculate once and file away. Recalculate it monthly, especially in the first year, so you can see whether trends are extending your runway or shrinking it, and react while there's still time to make changes.
A business with growing revenue and shrinking burn rate might see its runway extending even without any new cash coming in, which is a genuinely encouraging signal worth noticing.
Use It to Set a Decision Point, Not Just a Deadline
The point of tracking runway isn't to create a countdown clock that induces panic. It's to give yourself an honest checkpoint: if runway drops to a certain number of months, that's your signal to cut costs, raise capital, push harder on sales, or seriously reconsider the business model, before you're out of options entirely.
Set that trigger point in advance, while you're thinking clearly, rather than deciding what to do only after the number has already gotten uncomfortably low.
Longer Runway Buys You Better Decisions
Every month of extra runway is a month you're not making decisions out of desperation, whether that's accepting a bad client, cutting corners that hurt quality, or taking on expensive debt just to survive. Building in a longer cushion than you think you need, if you can manage it, tends to pay for itself many times over in the quality of decisions you're able to make along the way.
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