Calculate monthly burn rate, cash runway in months, and zero-cash date with revenue offset and funding scenarios.
Cash runway connects a company's available cash to its recurring cash deficit. Enter cash on hand, monthly cash expenses, and monthly cash revenue; the calculator derives net monthly burn, divides cash by that burn, and projects when the balance reaches zero. A funding scenario shows how added cash changes runway without implying that the underlying monthly burn changed. The common surprise is that revenue offsets expenses: this is a net-burn view, so it differs from a gross-burn figure that counts outflows alone.
A concrete input and expected output from the current implementation.
Input
As of 2026-08-15: cash on hand $12,000; monthly expenses $1,500; monthly revenue $500; additional funding $0.
Expected output
Monthly burn: $1,000; cash runway: 12 months; projected zero-cash date: 2027-08-15.
Net monthly burn is $1,500 - $500 = $1,000. Dividing $12,000 by $1,000 gives 12 months, which places the zero-cash date 12 calendar months after 2026-08-15.
Monthly net burn is recurring cash outflow minus recurring cash inflow. When that difference is positive, runway equals available cash divided by net monthly burn. Because the quotient can include part of a month, the result is an estimate rather than a promise that cash will remain available throughout the displayed final month.
A funding scenario increases the cash available for the runway calculation; it does not by itself reduce monthly expenses or increase recurring revenue. The zero-cash date translates the resulting runway from the calculation date into a calendar point. This projection assumes that the entered monthly amounts continue unchanged for the entire period.
Enter cash expenses and cash revenue separately. The calculator's monthly burn is net because revenue offsets expenses. Gross burn is the outflow amount before that offset, so use monthly cash expenses as a separate gross measure. Do not compare runway figures until you confirm that both use the same burn definition.
A cash injection alone does not change burn rate; it increases the funds available to absorb that burn. Burn changes only when recurring cash expenses or recurring cash receipts change. If financing is conditional or expected later, treat the scenario cautiously because promised money cannot cover obligations before it is received.
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