Burn Rate

Burn rate is the speed at which a startup consumes its cash reserves, measured in dollars per month. Gross burn is total monthly cash out; net burn subtracts any revenue collected to show the true monthly deficit. Investors use burn rate alongside runway to gauge how long a company can operate before needing additional capital.

formula.sh

Net Burn = Total Monthly Expenses − Monthly Revenue Collected

> Total Monthly Expenses: all cash outflows — payroll, infra, marketing, rent, software
> Monthly Revenue Collected: actual cash received (not accrued), i.e. MRR paid by customers
> Result is the net cash destroyed per month; a negative result means you are cash-flow positive

example

example.sh

Your startup pays $85,000/mo in salaries, $12,000/mo in infra and tools, and collects $42,000/mo in subscription revenue.

($85,000 + $12,000) − $42,000 = $97,000 − $42,000

→ $55,000 net burn per month

why it matters

Burn rate is the single clearest signal of how efficiently you are converting capital into progress. A high burn relative to revenue growth tells investors you have not yet found a capital-efficient growth motion — and that the next fundraise may arrive before the metrics do.

At the seed and Series A stage, investors are tolerant of burn when the growth rate justifies it. The moment growth slows while burn stays flat, you enter the danger zone. Monitoring burn monthly — not quarterly — gives you the reaction time to cut or redirect spending before the runway crisis is irreversible.

common mistakes

✗Confusing gross burn with net burn and overstating how dire (or rosy) the situation is

✗Forgetting to include one-time or irregular expenses like annual software subscriptions, which should be amortized monthly

✗Only reviewing burn quarterly instead of monthly, losing the ability to course-correct in time

pro tips

✓Build a rolling 3-month burn average to smooth out spikes from annual contracts or one-time payments

✓Track burn per headcount — if cost per employee is rising faster than revenue per employee, you have a hiring efficiency problem

✓Tie your burn review to a monthly board or leadership meeting so spending decisions have a forcing function

the mrrsucks take

You are spending $80K a month to generate $4K in MRR. That is not a startup, that is a very expensive hobby with Slack. Your burn rate has a better growth rate than your revenue.

faq

What is the difference between gross burn and net burn?+

Gross burn is total cash spent each month regardless of revenue. Net burn subtracts cash collected from customers. Investors care most about net burn because it shows the true cash deficit.

What is a healthy burn rate for an early-stage SaaS?+

There is no universal threshold — burn is only meaningful relative to growth. A $100K/mo burn producing 25% MoM growth is defensible. The same burn with 2% MoM growth is a capital destruction machine.

Should I cut burn aggressively at the first sign of trouble?+

Not always. Deep cuts to engineering or sales can destroy the growth engine you need to raise the next round. Identify discretionary spend first. Cut waste before cutting capacity.

High burn rate roasts›Default alive explained›

related metrics

./install-the-daemon

$9. 365 roasts. one public endpoint of pure shame.