Startup Burn Rate, Runway and the Burn Multiple, Explained

Short answer

There's no universal 'good' burn rate — it's only sensible relative to your runway and milestones. The sharper test is the burn multiple: net burn divided by net new ARR. Under 1x is excellent, 1–2x is healthy, and above 2x signals you're buying growth too expensively. Aim to fund 18–24 months of runway.

Most startups don't die on the day they run out of money. They die months earlier, when they stop watching the number that predicts it. CB Insights' 2026 shutdown analysis found the median failed startup went under 22 months after its last raise, long enough that the ending was visible if anyone had been reading the dashboard. Your startup burn rate is that dashboard. This piece covers how to calculate it, how much runway to hold, and the efficiency ratio investors quietly grade you on: the burn multiple.

Startup burn rate and runway: the two-minute version

Two definitions do most of the work.

• Net burn is the cash you lose in a month: everything paid out, minus everything collected. It's a bank-account number, not a P&L number, so read it off cash movements.
• Runway is how long the cash lasts: cash divided by average net burn. It's usually quoted in months of runway.

Calculating runway for a startup is genuinely this simple: €900K in the bank losing €60K a month is 15 months. The judgment lives in the burn figure. Average it over three months and strip out one-offs like a grant, or you'll trust a number that isn't real. German founders searching Runway berechnen land on the same formula. Whether you use gross or net burn changes the answer, and the gap between them is its own fragility signal; we pull that apart in gross burn vs net burn and cover the full method in how to calculate your runway.

What is a good burn rate and burn multiple for a startup?

There isn't a universal good burn rate; any benchmark that ignores your stage is noise. A €200K monthly burn is reckless for a pre-revenue team and conservative for a Series A company hitting its numbers. Burn is only ever high or low relative to the milestones it buys.

That's why investors moved past raw burn to an efficiency ratio. The real question: for all that cash, how much durable revenue are you creating? The metric that answers it is the burn multiple, and it decides whether your spending reads as investment or waste.

The burn multiple: what each euro of growth costs

The burn multiple was introduced by David Sacks of Craft Ventures in his 2020 essay of the same name. The formula is deliberately blunt:

Burn multiple = net burn ÷ net new ARR, over the same period.

Net new ARR is new plus expansion revenue, minus churn and contraction — the annual recurring revenue you actually kept. Sacks published a scale that still frames diligence conversations:

The reason investors trust it over a pitch deck: it can't be dressed up. You can argue about a hockey-stick chart or an adjusted margin. "You burned €3 to add €1 of net new ARR" ends the argument. Because churn, weak gross margins and over-hiring all push the multiple up, a single number captures problems that would otherwise hide in three different slides.

A worked example

Take a seed-stage SaaS company. Last quarter it spent €2.1M and collected €900K, so net burn was €1.2M. Over the same three months it signed €700K of new and expansion ARR but lost €200K to churn and downgrades, leaving €500K of net new ARR. Burn multiple = €1.2M ÷ €500K = 2.4x. On the scale above, that's "suspect": the company is paying €2.40 of cash for every €1 of durable new revenue.

Now the useful part. Two levers move it:

• Fix retention. Halve the €200K of churn and net new ARR climbs to €600K. The multiple drops to €1.2M ÷ €600K = 2.0x with no change in spending.
• Fix efficiency. Find €300K of quarterly burn that isn't producing revenue — an over-hired function, a channel that never converts — and net burn falls to €900K. The multiple becomes €900K ÷ €500K = 1.8x.

Do both and you're comfortably under 1.5x. Same market, same product, materially different company in an investor's eyes.

What a bad burn multiple is actually telling you

A high multiple is a symptom; the diagnosis is usually one of three things, in this order:

1. Churn is eating your gross additions. You're selling well and leaking out the back. The fix is retention, not more sales spend.
2. Headcount ran ahead of revenue. You hired for the company you expect to be, and revenue hasn't caught up. Common, and slow to unwind.
3. You're buying growth with discounts. Deep discounting inflates gross new ARR while the cash going out stays the same, so the multiple quietly worsens.

Sacks' framing is worth keeping in mind: if it takes an extraordinary amount of burn to produce the growth, product-market fit often isn't as strong as the top-line suggests. The burn multiple is where that shows up first.

What is a good burn multiple worth in runway?

Efficiency buys time, and time is what you're really managing. A lower burn multiple means each euro raised travels further, which turns "how much runway to hold" into a strategy question rather than an accounting one.

The working rule across venture is to fund 18–24 months, and investors have leaned toward the top of that range since capital got expensive. The arithmetic is unforgiving: a raise takes about six months to run, and you need a year or more of execution to hit the milestones that justify the next round. NYU Entrepreneurship's 2025 runway guidance lands in the same place: raise for the milestones plus the raise window, not for a round number of months. And recall the CB Insights figure. The median failed company died 22 months after its last raise, which is roughly what 18–24 months of runway protects against.

What this means for you

Compute your burn multiple this quarter the way an investor will: net burn from cash, net new ARR after churn, same period for both. Under 1.5x, your job is to hold it there while you scale. Above 2x, that's your most important operating problem, ahead of almost anything on the roadmap, because no amount of growth survives diligence if it's this expensive. Your own salary is part of burn, so set it deliberately in how to pay yourself as a founder, and put the multiple on the dashboard you review in the six numbers to check every month.