Runway Calculator
Calculate startup cash runway in months from current cash balance, monthly expenses, and optional monthly revenue.
Leave at 0 if you have no revenue yet
Result
Runway
10.0 months
Net Monthly Burn
$50,000
Estimated Runway Ends
July 1, 2027
How to Use the Runway Calculator
Enter your current cash balance and your monthly expenses (gross cash outflow). If you also have monthly revenue coming in, enter it too — the calculator subtracts revenue from expenses to get your net monthly burn rate before dividing it into your cash balance. Runway tells you how many months you can keep operating at the current burn rate before running out of cash.
Runway (months) = Cash Balance / Net Monthly Burn
Example
A startup has $500,000 in the bank, spends $60,000 a month, and brings in $10,000 a month in revenue. Net burn = $60,000 − $10,000 = $50,000/month. Runway = $500,000 / $50,000 = 10 months, meaning cash runs out roughly 10 months from today at the current pace.
Common Use Cases
- Deciding how urgently a startup needs to raise its next funding round.
- Modeling how a hiring decision or cost cut would change the runway timeline.
- Reporting cash health to investors or the board in board meeting updates.
FAQs
- What if my revenue exceeds my expenses? Then your net burn is zero or negative, meaning you're cash-flow positive and don't have a runway problem — the calculator will not show a runway figure in that case since you're not burning cash.
- Should I use gross burn or net burn? Net burn (expenses minus revenue) gives a more realistic picture of how fast your cash balance is actually shrinking. Gross burn (expenses alone) is useful too, but leaving revenue out of the field will effectively calculate gross-burn runway instead.
- Is the "runway ends" date exact? It's an estimate based on your current burn rate staying constant. Real burn rates fluctuate month to month with hiring, one-time expenses, and revenue changes, so treat the date as a planning guide rather than a guarantee.