The Wren Sessions, a working musician, holds $9,400 in cash against a monthly burn of $2,250, everything included: rent, gear, software, and the owner draw. That is 4.2 months of runway at current burn. Above the four-month line, which buys the freedom to think in seasons instead of weeks.
Runway = cash on hand ÷ monthly burn, using your heaviest recent burn month rather than your cheapest. The full reasoning, including what to do at each runway level, lives in the main runway guide; the calculator runs it with your numbers in your browser.
The twist for working musicians
With a $2,250 monthly burn against $9,400 of cash, the demo musician holds about four months, and that is the healthy version of creative income. Irregular earners should target six months, because the gap between paydays is the business model.