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Cash Flow Runway Calculator

Estimate how long available business cash may last, and how much cash could fund a target runway.

Use the same currency for all cash amounts. This calculator compares average monthly inflows and outflows; it is not a formal cash-flow forecast.

The calculation runs locally in your browser. No input values are saved or sent to a server.

Estimate how long cash will last or the funding needed for a target runway.

Cash currently available to fund operations. A zero balance is valid.

Average monthly cash received by the business.

Average monthly cash spent by the business (gross burn).

Monthly burn example

With $120,000 in cash, $40,000 in monthly inflows and $55,000 in monthly outflows, net monthly burn is $15,000 and estimated runway is 8.0 months.

About this calculator

Runway and net burn

Runway estimates how long available cash can support operations if current cash-flow assumptions continue. Net burn is monthly cash outflows minus monthly cash inflows.

Gross burn

Gross burn is total monthly cash outflows, before subtracting cash inflows.

Frequently asked questions

What does runway mean?

Runway estimates how long available cash can fund operations if the current average monthly net burn continues.

What if my business has positive cash flow?

When monthly inflows equal or exceed outflows, runway is not limited by current burn under those assumptions.

Runway is a planning estimate, not a formal cash-flow forecast or financial advice. Actual cash needs can change because of sales, collections, expenses, financing, taxes, capital spending and one-time events.