Runway: How Long Can Your Business Survive Without New Revenue?
If revenue stopped tomorrow.
Zero new sales. Zero new bookings. Zero new cash coming in.
How long can your business survive on the cash you have today?
That number is your runway. And it's one of the most important indicators in any business that few owners actually know with precision.
The simple formula and why it matters
Runway = Cash on hand / Monthly net burn
If you have $90,000 in cash and your business spends $30,000 a month net (after revenue), your runway is 3 months.
The math is trivial. The discipline of knowing the real number isn't.
Most owners know roughly how much is in the bank. Few know the precise net burn. And almost none know how those two numbers translate into actual months of survival without new revenue.
To understand how to calculate burn correctly with the 7 items most people forget, read Burn Rate: How to Calculate Yours Before It Becomes a Crisis.
What runway tells you that revenue can't
Runway isn't a crisis indicator. It's a freedom indicator. The longer it is, the more you can choose. The shorter it is, the more urgency overrides strategy.
A business with $200,000 in monthly revenue and 2 months of runway is in a worse position than a business with $50,000 in revenue and 18 months of runway.
The first looks impressive on the outside. The second has the breathing room to make smart decisions, walk away from bad clients, invest in growth without panic.
Revenue tells you what's coming in. Runway tells you what time you have.
The four runway zones and what each one demands
| Runway | Zone | What you can do | |
|---|---|---|---|
| Under 3 months | Survival | Every expense must justify itself. Cash-generating activities only. No experiments. | |
| 3 to 6 months | Caution | Operate normally with discipline. Every investment needs fast return. | |
| 6 to 12 months | Working room | Test channels, hire selectively, take calculated risks. | |
| Above 12 months | Strength | Say no to bad projects. Negotiate from position of power. Choose the right path, not the urgent one. |
12 months sounds like a lot until you start spending it. Growth phases shorten runway faster than most founders expect, because burn climbs in steps (new hire, new office, new tool) while revenue climbs as a slope.
The most common mistake: confusing revenue with cash
This is where many owners get caught.
A business can bill $100,000 a month and have only 1 month of runway, if monthly costs are $95,000 and the bank account holds just $30,000.
The numbers look healthy on the income statement. The cash position is brittle.
Profit on paper means nothing if the cash isn't there when you need it. Runway is the honest number, because it sees what's actually in the bank, not what's promised on a contract.
The reverse is also true: a business can bill less than its competitors and have a much longer runway because it kept costs lean and cash reserves disciplined. That's the company that survives downturns.
To understand the gap between gross margin and net margin, which directly drives how runway changes, read Gross vs Net Margin: which one matters more.
How runway changes the way you operate
The honest number does three things at once:
It removes denial
You can't manage what you refuse to look at. Knowing the real runway, even when it's uncomfortable, is the starting point for any meaningful decision.
It sequences your priorities
If runway is 4 months, the priority is cash generation, not brand building. If runway is 18 months, you can invest in long-arc projects without checking the bank account every Friday.
It calibrates your appetite for risk
A bet that makes sense with 24 months of runway is reckless with 4. The same opportunity changes meaning depending on the time horizon you have to ride out failure.
For practical levers to extend runway when it tightens up, see How to Extend Runway in 90 Days Without Raising Capital.
The provocation I want to leave you with
Take 5 minutes. Pull these numbers honestly:
- Cash on hand right now: $____
- Monthly net burn (after revenue) average over last 3 months: $____
- Current runway in months: ____
If the number that came up made you uncomfortable, that's information, not failure. The owners who survive long-term are the ones who know the uncomfortable number early enough to act on it.
The owner who knows their runway sleeps better. Not because the number is always good. Because they know the truth. And truth is the only foundation for intelligent decisions.
Dashboard with 18 indicators including runway, burn rate, MRR and growth. Right in your browser, no account needed.
Calculate My Runway Now →Runway is freedom measured in months. The longer it is, the more options you have. The shorter it is, the more the urgent crowds out the important. Knowing the real number doesn't make the runway longer. It makes you ready to act before time runs out.
Keep reading about KPIs
Gross Burn vs Net Burn: Which One to Use for Runway
Gross burn and net burn are two numbers — and both matter. Using the wrong one for runway distorts cash reality by months.
MRR vs ARR: The Real Difference and When to Use Each
MRR and ARR aren't the same metric viewed from different angles. They serve different functions — and using the wrong one distorts decisions.
SaaS Metrics Guide: The 8 Numbers That Actually Matter
MRR, churn, CAC, LTV, runway, burn rate. The 8 numbers that separate SaaS that survives from SaaS that dies — no fancy formulas, real numerical examples.
Frequently asked questions
What is runway in business terms?
Runway is the number of months your business can survive on the cash you have today, at your current spend rate, with no new revenue coming in. Formula: cash on hand divided by monthly net burn. If you have $90,000 in cash and spend $30,000 a month, your runway is 3 months.
What's the difference between runway and burn rate?
Burn rate is the monthly speed at which cash leaves the business. Runway is how long your current cash lasts at that speed. Burn is the rate, runway is the time horizon. You can't calculate runway without knowing burn first. To go deeper on burn, see Burn Rate: How to Calculate Yours.
What runway is considered healthy?
Above 12 months is comfortable: room to experiment, invest, and absorb mistakes. Between 6 and 12 months is workable but tight. Between 3 and 6 months is the warning zone. Below 3 months is survival mode where every decision is a cash decision. Each level changes how you operate, not just how you feel.
Why is high revenue not the same as long runway?
Because revenue isn't cash. A business can bill $100,000 a month and have one month of runway, if costs are $95,000 and cash on hand is just $30,000. High revenue with thin margin creates a dangerous illusion of safety. The honest number is always the runway, not the top line.
How often should I recalculate my runway?
Depends on the runway itself. Above 18 months: monthly. Between 6 and 18 months: every two weeks. Below 6 months or while fundraising: weekly. Runway shifts faster than founders expect, especially in growth phases when burn climbs in steps and revenue climbs as a slope.