How long do you have?

How this works

Burn rate is the speed at which your business is spending cash beyond what it brings in. Runway is how many months you have until that cash hits zero. We compute runway as cash on hand divided by net monthly burn (expenses minus revenue, when positive).

Two modes

• Simple: cash on hand + a single monthly burn figure. Use this when you already track your monthly burn and just want the runway number.
• Detailed: cash + revenue + expenses. We compute net burn and unlock the sensitivity grid, showing how runway shifts under expense cuts and revenue lifts.

When this is most useful

Founders use a runway read at three moments: before raising (to know how long the round needs to last), before a hire (to know the trade-off), and before a downturn signal (to know how much room you have to react). The CFO commentary tries to match the action set to your runway band — a 4-month runway needs defensive moves, a 24-month runway needs investment moves.

What this tool doesn't do

It assumes a flat monthly burn — real burn is rarely flat. It doesn't account for one-time inflows (fundraises, large customer payments) or seasonal expense patterns. For a true rolling 13-week cash flow forecast that updates from your QuickBooks, that's what Financial OS does.