Your burn multiple is how much cash you burn to add one dollar of new recurring revenue: net burn divided by net new ARR. If you burned $1M last quarter and added $1M in net new ARR, your burn multiple is 1.0x. Lower is better. Since Sacks published it in 2020, it has quietly become a number VCs reach for to judge whether your growth is worth what it costs. On his scale, under 1x is amazing and 1.5x to 2x is still good.
The metric was coined by David Sacks of Craft Ventures, who called it a "catch-all" for startup efficiency. His logic: almost any serious problem in a business eventually shows up here. Bloated spend inflates the numerator; weak sales, churn, or discounting shrinks the denominator. You can massage a growth-rate chart or a CAC number in isolation, but the burn multiple catches what the vanity metrics hide.
The formula, precisely
Burn multiple = net burn ÷ net new ARR, measured over the same period (usually a quarter or a year).
- Net burn is cash out minus cash in, your actual cash consumed, not an accrual number. It's the same figure that drives your runway.
- Net new ARR is the change in annual recurring revenue over the period: new ARR plus expansion, minus churn and contraction. The 'net' matters, it already bakes in retention.
Because net new ARR is a net figure, a churn problem quietly doubles its damage: it shrinks the denominator while your spend stays put. That's why the burn multiple moves fast when something breaks.
Burn rate vs burn multiple: don't confuse them
Plain burn rate tells you how fast you're spending cash, say, $400K a month. It's a survival number: burn rate plus your cash balance gives you runway. But burn rate says nothing about whether that spend is productive. A company burning $400K/month to add $800K of quarterly ARR is in a completely different position from one burning the same amount and adding nothing, yet their burn rate is identical.
The burn multiple fixes that blind spot by tying spend to growth. Think of burn rate as your speedometer and burn multiple as your fuel efficiency. You need both, but investors underwriting your next round care most about efficiency, because it predicts how much of their money converts into durable revenue.
| Burn rate | Burn multiple | |
|---|---|---|
| Question it answers | How fast am I spending? | How efficiently do I grow? |
| Formula | Net cash out per month | Net burn ÷ net new ARR |
| Tells you about | Runway / survival | Growth efficiency / quality |
| Can it be 'good' while growth is bad? | Yes | No |
The tiers VCs use
Sacks published a scale that has become the industry shorthand, reproduced here as it appears in The Burn Multiple (Craft Ventures, April 2020). He labels the column Efficiency, and the bands touch rather than gap, so a company at exactly 1.5x sits on the line between two ratings:
| Burn multiple | Rating | What it signals |
|---|---|---|
| Under 1.0x | Amazing | You're adding more ARR than you burn, exceptional efficiency |
| 1.0x – 1.5x | Great | Strong, capital-efficient growth |
| 1.5x – 2.0x | Good | Healthy for an early-stage company scaling hard |
| 2.0x – 3.0x | Suspect | Investors start asking hard questions |
| Over 3.0x | Bad | You're buying growth expensively; hard to defend |
Context matters, and Sacks stage-adjusts himself: he calls a 2x burn multiple reasonable for an early-stage startup, while describing a 5x in his own worked example as terrible. Seed and Series A companies get more latitude than growth-stage ones, but the direction of travel matters as much as the level. A burn multiple trending down quarter over quarter tells a far better story than a flat one, even at the same absolute number.
Your burn multiple is only as trustworthy as the books underneath it. If net burn is computed off a ledger that's weeks behind, or ARR is tracked in a spreadsheet that mixes recurring and one-time revenue, the number lies. Clean, current, accrual-based books are the prerequisite, the metric comes second.
Four ways the calculation goes wrong
The formula is one division, so when a burn multiple is misleading it is almost always the inputs. These four account for most of it, and three of them flatter the number rather than harming it, which is why they survive unchallenged.
- Using gross burn instead of net. Gross burn ignores cash coming in, so it overstates the numerator, sometimes substantially for a company with real revenue. The metric is defined on net burn, and quoting it on gross makes your figure incomparable to everyone else's.
- Using gross new ARR instead of net. The mirror error, and the flattering one. Counting new and expansion while ignoring churn and contraction can improve a reported burn multiple dramatically, and it removes precisely the signal the metric exists to carry.
- Mismatched periods. Burn measured over a quarter against ARR movement measured over a trailing twelve months, or a quarter of spend against a month of ARR growth. Both halves must cover the same window.
- One-off items left in. A tax refund, a grant, an equipment purchase, or a legal settlement lands in one period and distorts the ratio for that period. Strip them out if you must, but strip them out in every period rather than only the ones where it helps, and say that you have.
A practical safeguard: write your method down once, including how you treat one-offs, and recalculate the last four quarters on that method whenever you report it. A burn multiple that improved because the method changed is the version investors are most alert to, because it is the one they see most often.
When the denominator is zero or negative
Every explanation of this metric assumes net new ARR is a positive number. Two situations break that, and both are common enough that founders hit them and quietly stop reporting the metric rather than reporting it honestly.
If net new ARR is zero or negative, the burn multiple is undefined or negative, and neither is meaningful. A negative burn multiple is not a good burn multiple, and presenting it as a number invites the reader to think you are either confused or hiding something. The honest treatment is to say the ratio is not meaningful this period, state the two inputs separately, and explain the shrinkage. Burning $400,000 to lose $50,000 of ARR is a clear statement. Dividing them and reporting minus 8x is not.
If net new ARR is very small but positive, the ratio explodes. Adding $10,000 of net new ARR on $400,000 of net burn is a 40x burn multiple, which is technically correct and practically just another way of saying growth stopped. In a quarter like this the ratio carries less information than the inputs, so lead with the inputs.
In both cases the metric is doing its job. It moves violently when growth stalls, which is why it works as an early warning, and it also means a single bad quarter can produce a figure that misrepresents the trend. Report it as a trailing four-quarter figure alongside the quarterly one and both problems shrink: the annual view smooths a single distorted quarter, while the quarterly view still shows you the turn when it happens.
How to actually improve it
- Fix retention first. Because churn hits net new ARR directly, improving net revenue retention is often the highest-leverage move, it grows the denominator without spending a dollar more.
- Cut spend that isn't producing ARR. Audit the numerator: which line items are actually driving new or expansion revenue? Sacks' point is that efficiency, not austerity, is the goal, cut what doesn't convert.
- Shorten the gap between spend and revenue. Faster sales cycles and quicker onboarding mean the cash you burn shows up as ARR sooner, tightening the ratio.
- Track it monthly, not just at board meetings. The metric is a leading indicator; watching it monthly lets you catch a deteriorating trend before it becomes a fundraising problem.
Most founders don't need a full-time finance hire to get this right, they need someone who can produce the clean, current numbers and interpret them in board language. That's the core of what a fractional CFO does: turn your ledger into the efficiency story your investors are already grading you on.
Burn multiple is one of six numbers worth watching continuously rather than quarterly, and it is the one that moves first when something breaks. For the full set and how to keep them current, see how to track financial KPIs for your startup. For getting them in front of investors each month, see investor-ready monthly financials.