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Runway calculator

Enter the cash balance and the monthly burn rate — net cash outflow per month (spending minus revenue). The calculator works out how many months the cash will last.

Net cash outflow per month: how much cash goes out minus how much comes in. If the business already spends less than it earns, enter 0

Result

Runway, months

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This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.

How it is calculated

Runway = cash balance ÷ monthly burn rate. It's not how long the company will exist — it's how long the cash lasts if nothing changes, neither revenue nor spending.

Burn rate is specifically the net figure: not all of a company's spending, but spending minus all incoming revenue. If revenue grows faster than spending, burn rate falls and runway extends on its own, without any extra funding.

Runway is a snapshot, not a forecast: actual burn rate usually changes — it rises with hiring, falls as revenue grows. It's worth recalculating regularly rather than once, and treating the result as a planning signal for the next funding round or cost cuts, not as a fixed deadline.

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