What Is Runway, And Why Every Founder Should Obsess Over It
There's one number every investor will ask about. One number that shapes every hiring decision, every marketing spend, every strategic move you make.
That number is your runway.
Yet most founders either don't know it precisely, or are working from a number that's already outdated.
What Is Runway?
Runway is the number of months your company can continue operating before it runs out of cash, given your current burn rate.
The formula is simple:
Runway = Current Cash Balance ÷ Monthly Net Burn Rate
If you have ₹50 lakhs in the bank and you're burning ₹5 lakhs per month, your runway is 10 months.
What Is Burn Rate?
Burn rate is how much cash you spend each month, net of any revenue coming in.
Gross burn: Total cash out each month (salaries, rent, software, marketing, etc.)
Net burn: Gross burn minus monthly revenue
For pre-revenue startups, gross burn and net burn are the same. For revenue-generating companies, net burn is the number that actually tells you how fast you're depleting cash.
Why Founders Get It Wrong
They use last month's numbers
Burn rate changes constantly. One new hire, one annual subscription, one ad campaign spike, and your burn looks nothing like it did 30 days ago. Using stale numbers gives you false confidence.
They forget one-time costs
Server migration. Legal fees. A conference. These aren't in your "normal" monthly burn, but they come out of the same cash reserve. Ignore them and you're surprised every quarter.
They don't account for revenue growth
If your revenue is growing, your net burn is shrinking. If it's seasonal, your burn fluctuates. A static burn number misses all of this.
How Much Runway Should You Have?
As a general benchmark:
6 months: Start raising now. This is dangerously short.
12 months: Comfortable to operate, but start fundraising conversations.
18+ months: You're in a strong position. Use this time to grow.
If you're approaching 6 months, every financial decision needs a hard look. Every expense needs justification.
How to Track Runway Properly
Runway isn't a one-time calculation, it's a living number. Here's how to stay on top of it:
Update it weekly, not just at board meetings
Break burn into fixed vs. variable costs, so you know what's controllable
Model scenarios: what happens to runway if you hire two people? If revenue drops 20%?
Tie it to your financial dashboard, so it's always visible, not buried in a spreadsheet
This is exactly what fnivo is built for. Upload your bank statements, and your runway, burn rate, and cash position update automatically, in real time, without manual calculation.
The Bottom Line
Runway is not just a metric. It's the clock your business is running against.
Knowing it precisely, updated, broken down, and tied to your decisions, is the difference between founders who always seem calm and those who are constantly surprised.
Startup runway is the number of months a company can operate before it runs out of cash, calculated as current cash balance divided by monthly net burn rate. It is the single most important financial metric for early-stage founders.
What is a good runway for a startup?
18 or more months is a strong position. 12 months is manageable but fundraising conversations should begin. Anything under 6 months is a critical situation that requires immediate action.
What is the difference between gross burn and net burn?
Gross burn is the total cash your business spends each month. Net burn is gross burn minus any revenue coming in. Net burn is the number that tells you how fast you are actually depleting your cash reserves.
How can I track runway automatically?
fnivo calculates your runway in real time from your bank statements. As your cash balance and burn rate change, your runway figure updates automatically, so you always have an accurate number. See how fnivo works.
About the Author
Rohan Verma is a finance writer at fnivo, covering financial tools and strategies for Indian founders and growing businesses.
What Is Runway, And Why Every Founder Should Obsess Over It
