Why gross burn matters to a first-time founder
Gross burn shows what your current set-up costs to run each month, regardless of what customers paid. Watching only net burn can hide a fast-growing cost base behind one good sales month; if revenue then dips, cash disappears faster than planned. Gross burn tells you how much you would need to cut, or raise, if receipts dried up, which is exactly what investors and lenders will ask.
Examples of gross burn
Rent, tools, a contractor, and ads come to $6,000 in March. That $6,000 is the gross burn, even though customers paid $2,000. The $2,000 changes the net burn. It does not shrink the fact that the company knows how to spend $6,000 a month, and will do it again if nothing is cut.
Common misunderstanding
People think a lower gross number is always the goal, or they mix it up with net burn. Cutting gross burn extends runway only if the cash in stays. Cutting the ads that were bringing the $2,000 can improve the gross figure and worsen the net one. Look at both before you celebrate a cut.
When to use it
Check gross burn every month alongside net burn, and look again before you approve a new hire or tool, set a budget or prepare a fundraise. If gross burn is rising faster than revenue, decide which costs you would cut first if sales stalled. Use the gap between gross and net burn to judge how much your runway depends on customers paying on time.