Cash flow runway.

Starting from your cash on hand, the calculator adds monthly revenue and subtracts monthly burn for each of the next 24 months, compounding revenue at your chosen monthly growth rate (which can be negative). The chart plots the resulting balance month by month, shading it blue while it is positive and copper once it crosses zero. Three numbers come out of that path: a runway figure, which is the month the balance would first go negative, or 24+ if it never does; the projected ending balance at month 24; and the break-even month, which is when monthly revenue first catches up to monthly costs.

This is a single fixed cost figure compounding against a single growth rate, which is a reasonable way to feel out a scenario but not how cash actually moves. A real runway model works from your actual accounts receivable and payable timing, seasonality in your revenue rather than a flat monthly rate, separate cost categories that grow at different speeds, financing terms and covenants if you carry debt, and the timing of tax payments and distributions. We build that against your books, not a slider.