How Long Will Your Money Last?
Cash runway tells you how long your business can keep operating before it runs out of cash at its current burn rate. It turns abstract spending into a timeline, which is why it is one of the most important planning numbers a founder tracks. The key distinction is gross burn versus net burn, because revenue changes the picture.
On this page
- Runway equals cash on hand divided by net monthly burn.
- Net burn (spend minus incoming cash) is the number that matters, not gross burn alone.
- Runway is a living figure: recalculate it whenever pricing, headcount, collections, or large costs change.
- A few connected decisions, like trimming spend and improving collections, can add many months of operating time.
What this means
Gross burn is your total monthly operating spend. Net burn adjusts for the cash coming in from revenue. The simple runway formula is cash on hand divided by net monthly burn.
Net burn: Monthly operating spend minus the cash you actually collect in that month. It is the real rate at which your bank balance falls.
If the company has 180,000 dollars in cash and loses 15,000 dollars per month, runway is 180,000 divided by 15,000, or 12 months. If improved collections or lower costs reduce net burn to 10,000 dollars, runway extends to 180,000 divided by 10,000, or 18 months.
Why it matters
Runway drives hiring, fundraising timing, marketing spend, and vendor commitments. It also determines whether a business has time to learn from the market before it needs more capital. Many founders look at profit or top-line revenue and assume they are safe, then discover too late that collection timing, payroll, or fixed costs create a much shorter survival window. Runway is the number that forces honesty.
Common mistakes
- Using profit instead of cash to judge survival.
- Ignoring one-time payments and large annual obligations.
- Forgetting tax obligations.
- Treating an annual prepayment as if it were monthly revenue.
- Failing to update runway when assumptions change.
Spreadsheet limitations
A spreadsheet can calculate runway with one formula. The trouble is that runway matters most exactly where spreadsheets are fragile: when several assumption changes compound across time.
| Feature | Startup Suitelive timeline | A spreadsheetthe manual way |
|---|---|---|
| Calculation | Connects runway to changing assumptions and scenarios | Calculates a single number with one formula |
| Updates | Cash, burn, and scenarios live in one workspace | Relies on manual monthly updates |
| Funding gaps | Visualises the gap on a timeline | Harder to see clearly |
- Calculation
- Connects runway to changing assumptions and scenarios
- Updates
- Cash, burn, and scenarios live in one workspace
- Funding gaps
- Visualises the gap on a timeline
- Calculation
- Calculates a single number with one formula
- Updates
- Relies on manual monthly updates
- Funding gaps
- Harder to see clearly
Consultant limitations
| Feature | Startup Suiteoperating layer | A consultantepisodic |
|---|---|---|
| Best for | Weekly or monthly operating decisions | Fundraising strategy and finance review |
| Cadence | Continuous updates as revenue and spend change | Usually engaged episodically |
| Output | Keeps runway live as assumptions move | Often a point-in-time estimate |
- Best for
- Weekly or monthly operating decisions
- Cadence
- Continuous updates as revenue and spend change
- Output
- Keeps runway live as assumptions move
- Best for
- Fundraising strategy and finance review
- Cadence
- Usually engaged episodically
- Output
- Often a point-in-time estimate
How Startup Suite helps
Startup Suite's runway view is the founder's operational cash timeline. Instead of asking what is my runway once, it supports the more useful question: what extends runway fastest right now? Forecast Engine connects cash, burn, and scenarios so the answer updates as you change the inputs.
Forecast Engine: a runway that stays current
- See cash, gross burn, and net burn on one timeline.
- Test a hiring freeze or a collections improvement and watch runway move.
- Spot the funding gap early enough to act on it.
A practical founder example
Assume a cash balance of 240,000 dollars, monthly payroll and overhead of 38,000 dollars, and monthly cash collections of 22,000 dollars. Net burn is 38,000 minus 22,000, or 16,000 dollars. Runway is 240,000 divided by 16,000, or 15 months.
Now test two changes: reduce nonessential spend by 4,000 dollars and increase monthly collections by 3,000 dollars. New net burn is 38,000 minus 4,000 minus 25,000, which is 9,000 dollars. New runway is 240,000 divided by 9,000, or about 26.7 months.
A few connected decisions added nearly a year of operating time. That is why modelling runway, rather than guessing it, changes what you decide to do this month.
Watch the 60-second summary
How long will your money last?
Frequently asked questions
What is a good cash runway?
It depends on the business and the funding plan. The more uncertain the environment, the more valuable extra runway becomes. Specific target benchmarks are context-dependent.
Is runway the same as burn rate?
No. Burn rate is the monthly loss of cash. Runway is how long your available cash lasts at that burn rate.
Should profitable companies still track runway?
Yes. Profit and cash timing can diverge. A profitable company can still get into trouble if collections lag or large obligations hit early.
Still have questions? Talk to the team.
