The Startup Runway Calculator estimates how many months cash can cover operating burn. A basic runway calculation is:
When revenue and expenses change over time, the result should be interpreted as a scenario rather than a fixed date.
Questions
What is net burn?
Net burn is cash expenses minus cash revenue for the period. A profitable month has zero or negative burn in this simple model.
Does runway predict fundraising success?
No. It shows modeled cash duration and does not predict funding, sales, hiring, or unexpected expenses.
Should I use average or current burn?
Use a period that reflects the decision. Average burn smooths volatility; current burn may better reflect a recent change.
Limitations
Taxes, debt, one-off costs, revenue seasonality, and working-capital changes may materially alter real cash runway.