What is burn rate?

Burn rate is the rate at which your business is consuming cash — net cash outflow per month. It is the metric that startups made famous, but every seasonal cafe, every winter-quiet boutique, every salon opening a new location lives on the same arithmetic. Formula in its simplest form: Burn rate = Starting cash − Ending cash, divided by the number of months. Pair it with cash runway and you know exactly how long the current operating shape is survivable. nouz tracks daily EBIT alongside cash so you can see burn coming weeks before the bank balance does.

TL;DR

Definition, in shop-owner English

Gross burn is everything cash that left the bank in a month — rent, payroll, supplier invoices, software, tax payments, owner draws. Net burn is gross burn minus the cash that came in (revenue collected, not revenue invoiced). Net burn is the figure that matches the change in your bank balance — what most owners mean when they say "we burned €4.000 last month."

Burn rate is a cash metric, not a profit metric. A shop can have a perfectly healthy EBIT and still burn cash — for example, if it just paid for six months of stock upfront. And a shop can be profitless on the P&L and still build cash — if customers prepay for a year and the costs are spread monthly. Cash and profit are not the same number. See cash flow vs profit for the full reconciliation.

For most small shops most of the time, profit and cash track each other closely. Burn rate becomes critical in two scenarios: a seasonal off-season (winter for ski-town cafes, summer for indoor businesses), and a deliberate investment (new location, equipment purchase, marketing push). In both, you are accepting some weeks of burn in exchange for later upside.

The formula and a worked example

Gross burn       = Total monthly cash outflows
Net burn         = Cash outflows - Cash inflows
Avg net burn (3m) = (Cash at start of 3m - Cash at end of 3m) / 3

A boutique with €22.000 in the bank at the start of January. By the end of March: €14.500 left. The winter quarter was the predictable quiet season.

Average net burn for the quarter: €2.500/month. With €14.500 left at end of March and April-May still likely loss-making, the cash runway is roughly 5,8 months at the current rate — enough to reach the summer recovery, but only just. The interesting decisions happen here: would a stock-clearance sale or a short-term reduction in marketing flatten the burn? Or is the right move to do nothing and trust the seasonal recovery?

When burn rate matters most

For a profitable, steady shop, burn rate is uninteresting most months — net cash is roughly flat or building. The metric earns its keep in four specific situations.

Outside these four, burn rate is a sanity check more than a daily metric. The owner of a profitable salon does not need to track burn rate weekly. They do need to glance at it once a quarter to confirm the reserve is building, not shrinking.

A few rules of thumb turn burn rate into decisions. These are rough guides for a seasonal small shop, not fixed laws — a voluntary, planned burn can safely run longer than an accidental one. You can turn a burn figure into a runway estimate with the cash-flow runway calculator.

Common mistakes

• Confusing burn with runway. Burn rate is the speed cash leaves (euros per month); runway is how long that speed can continue (months). A €3.000 burn is comfortable with €40.000 in the bank and critical with €6.000. You need both numbers.
• Tracking gross burn instead of net. Gross burn (all outflows) tells you what the business costs to run; net burn (outflows minus inflows) is what actually shrinks the bank balance. Runway planning uses net burn — gross burn overstates the danger.
• Reading burn off a single month. Supplier-invoice timing and quarterly tax payments make any one month noisy. Use a 3-month rolling average or a big VAT month will look like a crisis.
• Treating burn as a loss on the P&L. Cash and profit are not the same number. A shop can burn cash while turning a paper profit (it just prepaid six months of stock) or build cash while showing a loss (customers prepaid a year). Burn is a cash metric.
• Ignoring owner draws. Money the owner takes out is real cash leaving the business. Leaving draws out of the burn calculation makes the runway look longer than it is.

Why it matters for daily P&L

Burn rate is the early-warning version of "are we running out of money?" — and it answers that question weeks before the bank balance does. A shop with €12.000 in the bank and €3.000/month of net burn has roughly four months of runway. A shop with €12.000 and €1.000/month of burn has a year. The same bank balance, two completely different situations.

The link to daily P&L is direct: persistent negative EBIT becomes burn within weeks. A cafe that runs at −€80/day EBIT will burn roughly €2.400 of cash in a month, give or take working-capital movements. Catching the negative EBIT trend on day three is the difference between a fixable problem and a depleted reserve.

For the pair calculation, see cash runway. For the cash-vs-profit reconciliation, see cash flow vs profit.

How it shows up in your daily P&L

Burn is a month-end number, but it is built one day at a time. A persistent negative EBIT is what turns into cash burn a few weeks later, once working-capital timing settles out. The value of watching daily profit is that you see the burn forming while it is still a string of −€80 days, not after it has drained three weeks of reserve. A cafe running at −€80/day EBIT is on track to burn roughly €2.400 that month; catching the pattern on day three is the difference between a tweak and an emergency.

Related concepts

• Cash runway — burn rate's sibling metric: how long until the reserves run out.
• Cash flow vs profit — why burn rate and EBIT are not the same number.
• Seasonal business financial planning — managing a predictable burn season.
• What fixed costs actually mean — the cost layer that drives most burn rate.

Common questions