Gross vs net burn rate: what's the difference and which one matters?
May 20, 2026 · 4 min read
Burn rate is one of those terms that everyone uses but surprisingly few people define precisely. Ask two founders what their burn rate is and you'll often get different things — one is quoting gross burn, the other net burn, and neither has told you which.
The distinction matters. Gross burn and net burn answer different questions about your financial situation. Here's how to tell them apart, how to calculate each from your QuickBooks data, and when to use which one.
The definitions
Gross burn rate is the total amount of cash your company spends in a month on operations — payroll, rent, software, contractors, marketing, and everything else. It's the sum of all cash outflows from operations, regardless of any revenue coming in.
Net burn rate is gross burn minus any cash inflows — revenue, interest income, grants, or other cash receipts. Net burn is the rate at which your cash reserves are actually shrinking.
A simple example:
| Month | Gross burn | Revenue | Net burn |
|---|---|---|---|
| April | $120,000 | $45,000 | $75,000 |
Gross burn is $120k. Net burn is $75k. Your cash pile shrinks by $75k that month.
Why both numbers matter
Gross burn tells you about your cost structure. It answers: how much does it cost to run this business? This is the number to watch when you're thinking about operational efficiency, headcount costs, or whether a hiring plan is sustainable.
Net burn tells you about runway. It answers: how fast is our cash disappearing? This is the number you use in the runway formula:
Runway = Cash balance ÷ Net monthly burn
If you use gross burn for the runway calculation, you'll dramatically underestimate your runway (because you're ignoring the revenue offset). If you quote net burn when a board member asks about cost structure, you'll mislead them about how expensive the business really is.
How to calculate each from QuickBooks
The cleanest source is your Statement of Cash Flows in QuickBooks Online.
For gross burn: look at the "Operating Activities" section and sum all the cash outflow line items (cash paid to employees, cash paid to suppliers, etc.). This is total cash spent on operations.
For net burn: use the single "Net Cash Provided by (Used in) Operating Activities" figure at the bottom of the Operating Activities section. A negative number means cash is leaving the business — that's your net burn for the period.
Alternatively: pull your Profit & Loss for cash-basis accounting and note total expenses (gross burn proxy) and net income (net burn proxy) — though the Statement of Cash Flows is more accurate because it captures actual cash timing, not accrual-basis bookings.
Common sources of confusion
"We're burning $200k a month" — which one? Most people say "burn rate" when they mean net burn. But if your gross burn is $200k and your revenue is $150k, your net burn is only $50k — a very different picture of your runway.
One-time items inflate gross burn. A big annual software payment or a one-time legal fee makes a single month's gross burn look scary. Average over 3–6 months and flag any large non-recurring items.
Revenue vs cash in. Net burn should use actual cash received, not booked revenue. If you invoice in January but collect in March, that revenue doesn't offset your January burn.
Pre-revenue vs post-revenue. For a pre-revenue startup, gross burn and net burn are identical — there are no inflows. Once you're generating revenue, the two numbers diverge and you need both.
Which one to use when
| Situation | Use |
|---|---|
| Calculating runway | Net burn |
| Evaluating headcount or cost decisions | Gross burn |
| Board reporting | Both |
| Investor diligence | Both (they'll ask) |
| Internal weekly cash check | Net burn |
In practice, track both. Your gross burn tells you what you're spending. Your net burn tells you how long you have.
The trend is as important as the level
A single month's burn rate is a snapshot. The trend is the story. If your net burn has crept from $60k to $90k over 6 months while revenue stayed flat, your runway is compressing even if the absolute numbers don't look alarming. That's the kind of slow deterioration that's easy to miss until it's urgent.
RunwayWatch tracks both gross and net burn over time directly from your QuickBooks data, so you can see whether burn is steady, improving, or accelerating — and get alerted before it becomes a problem.