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.
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.