Unit Economics Wiki
Burn Multiple
The burn multiple divides net burn by net new ARR to show how much cash a company consumes to add one dollar of recurring revenue.
Snapshot
What it is
A capital-efficiency ratio that puts cash consumption over recurring-revenue growth for the same period:
Burn Multiple = net burn / net new ARR
net new ARR = closing ARR − opening ARR
Why it matters
Growth on its own is a claim. Burn multiple prices that claim in cash and makes the exchange rate visible to a board in one line.
Who defined it
David Sacks coined the term at Craft Ventures in April 2020, explicitly by flipping Bessemer's Efficiency Score (net new ARR ÷ net burn) so that cash sits in the numerator and a bigger number visibly means worse. He describes it as an annualised version of Dave Kellogg's Hype Ratio. It is a venture heuristic with a named author, not a standard.
What it is not
It is not a return, not a margin, not evidence that the ARR is profitable, retained, collectible, or high-margin. Neither input has an accounting definition.
Key takeaways
Both inputs are policy choices. Write down whether net burn includes capex, interest, debt principal, restructuring and acquisition consideration — then never change it mid-year without a bridge.
The denominator is net new ARR. Expansion, contraction and churn are already inside it; bookings and new-logo ARR are not substitutes.
It is undefined or meaningless when net new ARR is zero or negative. Report the cash burn and the ARR decline separately instead of dividing.
Acquired ARR must come out of the denominator — and any cash paid for the acquisition must come out of the numerator, or you double-penalise.
A low multiple on cheap, churning, low-margin ARR is not efficiency. It is a measurement artefact.
On this page10 sections
What is the burn multiple?#
It answers one question: how much net cash did the company consume to add one dollar of annual recurring revenue in this period? Sacks' own examples are the cleanest calibration available. A startup that burns $2M in a quarter while adding $1M of net new ARR has a 2x burn multiple, which he calls reasonable for an early-stage company. One that burns $5M for the same $1M has a 5x multiple — "it should probably cut costs immediately," because it is spending like a later-stage company without delivering later-stage growth.
The expected path is downward with maturity: roughly 3 at seed, around 2 after a Series A, tighter after a Series B once the sales team is at scale, and necessarily approaching 0 as a company reaches profitability, since burn itself must reach zero. A multiple moving the wrong way as the company matures is the signal, more than any single reading.
Sacks' argument for the ratio is that it is a catch-all: a gross-margin problem, a sales-efficiency problem, a churn problem, a stalling-growth problem, or a founder who cannot control spending will each eventually show up in it, by raising burn, lowering net new ARR, or both.
Why does the definition of each input matter?#
Because neither input is defined by an accounting standard, and each has a defensible range.
| Input | Reasonable choices | What the choice does |
|---|---|---|
Net burn | Operating cash flow only | Flattering for software companies that capitalise engineering |
Operating + investing, excluding financing | The common venture reading; includes capex | |
Change in cash and equivalents, unadjusted | Wrong — financing inflows silently reduce reported burn | |
Net new ARR | Closing ARR − opening ARR | The definition; already net of churn and contraction |
Organic only, excluding acquired ARR | Right for measuring the internal growth engine | |
New-logo ARR or bookings | Not the burn multiple; inflates the denominator |
The capex question is not academic for software companies. Blackbaud's FY2025 free cash flow of $203.5 million reflected $265.6 million of operating cash flow less $54.2 million of capitalised software development and $7.8 million of property and equipment — capitalised engineering was 87% of total capex. A burn multiple built on operating cash flow alone would exclude the majority of that company's real cash cost of building product.
SEC staff guidance on free cash flow is the right discipline to borrow even for a private board pack: the measure has no uniform definition, the calculation must be clearly described, and it must not be presented as if the cash were wholly available for discretionary use. A burn figure deserves the same treatment.
Key Facts
The formula and its authorship are specific
David Sacks defined Burn Multiple = Net Burn / Net New ARR in April 2020, arriving at it by inverting Bessemer's Efficiency Score (net new ARR ÷ net burn) so that burn sits in the numerator; he frames it as an annualised version of the Hype Ratio.
The published calibration is 2x acceptable, 5x a cost-cutting trigger
Burning $2M for $1M of net new ARR is "reasonable for an early-stage startup"; burning $5M for the same $1M is a multiple at which the company "should probably cut costs immediately." Requiring 3x burn or more is treated as an indicator that product-market fit is weaker than it appears.
David Sacks, "The Burn Multiple"The metric is arithmetically undefined pre-revenue
Sacks notes directly that if a startup is pre-revenue, net new ARR is zero "so the ratio will not even compute." That is a property of the formula, not a data problem.
David Sacks, "The Burn Multiple"The marketplace adaptation swaps the denominator to gross profit and the period to year-over-year
Craft Ventures' Jeff Fluhr replaces ARR growth with growth in annualised gross profit — because marketplace P&L classification between GTV, net revenue and COGS is subjective, and marketplace gross margins range roughly 35% to 85% against roughly 70% to 85% for SaaS. In his worked example a seasonal quarter-over-quarter dip produces a burn multiple of −51.5, which he says should simply be disregarded, while the year-over-year readings of 0.7 and 0.9 are the meaningful ones.
Jeff Fluhr, "Applying the Burn Multiple to Marketplace Business Models," Craft Ventures, 1 June 2022Capitalised software is real cash, and excluding it moves the ratio
Blackbaud's FY2025 capital expenditure was 87% capitalised software development ($54.2 million of $62.0 million). Any burn policy that starts from operating cash flow omits that spend entirely.
Blackbaud Q4/FY2025 results, 10 February 2026How do you calculate it?#
1. Match the periods exactly#
Quarterly burn against the change in ARR over that same quarter; annual against annual. Because go-to-market spend generally precedes the revenue it produces, also track a rolling four-quarter version — a single quarter can be dominated by hiring that has not yet closed anything.
2. Build the ARR bridge first#
Opening ARR, new-logo, expansion, contraction, churn, foreign exchange, acquisitions, closing ARR. Net new ARR must equal closing minus opening; if the bridge does not tie, the denominator is not trustworthy and neither is the ratio.
3. Build the cash bridge second#
Start from the change in cash and marketable securities. Remove equity and debt financing inflows and repayments. Decide and disclose the treatment of capital expenditure, interest, restructuring and acquisition consideration.
net burn = −(change in cash and equivalents) + financing inflows − financing outflows
± disclosed policy adjustments
4. Keep the sign convention honest#
Positive means cash consumed. If the company generated cash, say so — report negative net burn or cash generation explicitly rather than presenting a comforting zero or an absolute value.
5. Diagnose, do not just report#
The multiple is an outcome. The causes live in gross margin, NRR and GRR, CAC and payback by channel, rep ramp and quota capacity, implementation load, and runway.
6. Compare against yourself before anyone else#
Stage, gross margin, capital intensity and billing terms all move the number. Your own trailing four quarters and your own plan are better comparators than a benchmark table.
Worked example#
A SaaS company opens the quarter at $8.0M ARR and closes at $9.2M. The ARR bridge shows $1.4M new-logo, $0.4M expansion, $0.2M contraction, $0.4M churn.
net new ARR = $1.4M + $0.4M − $0.2M − $0.4M = $1.2M
check = $9.2M − $8.0M = $1.2M ✓
Cash falls from $10.0M to $7.4M. During the quarter the company bought $0.3M of servers and drew $0.5M on an equipment loan. Under a policy that includes capex and removes financing:
net burn = $10.0M + $0.5M − $7.4M = $3.1M
burn multiple = $3.1M ÷ $1.2M = 2.58x
The same quarter under a different policy. Using operating cash burn only, excluding the server purchase:
net burn = $3.1M − $0.3M = $2.8M
burn multiple = $2.8M ÷ $1.2M = 2.33x
Neither is wrong. Both must be labelled. A 0.25x swing from a policy choice is larger than most quarter-to-quarter operating movement, which is why the policy statement belongs on the same slide as the number.
The acquisition adjustment, done properly. Suppose $0.5M of closing ARR arrived through an acquisition completed in the quarter. Organic net new ARR is $0.7M:
organic burn multiple = $3.1M ÷ $0.7M = 4.43x
The unadjusted 2.58x materially overstated the internal growth engine. But note the symmetric requirement the shortcut usually misses: if the acquisition consumed cash, that consideration is sitting in the numerator too. If the company paid $0.9M for the business, the organic calculation is:
organic net burn = $3.1M − $0.9M = $2.2M
organic burn multiple = $2.2M ÷ $0.7M = 3.14x
Removing acquired ARR without removing acquisition cash charges the operating engine for a deal it did not run — 4.43x against a defensible 3.14x. Adjust both sides or neither.
The caveat that matters: all four of these numbers describe one quarter of a business whose sales investment produces revenue over several quarters. The ratio has no lag structure at all. Use it as a trend against your own history, and let cohort-level payback carry the causal argument.
What are the common mistakes?#
- Using gross operating expense as the numerator. The metric relates net cash consumption to growth. Gross spend answers a different question.
- Using bookings or new-logo ARR as the denominator. Net new ARR already nets churn and contraction; substituting a gross figure inflates apparent efficiency exactly when retention is deteriorating.
- Forgetting to strip financing from the cash bridge. A debt draw or a bridge round reduces the change in cash and makes burn look smaller. It is not.
- Dividing by a small or negative denominator. As net new ARR approaches zero the ratio explodes; below zero it turns negative and reads as though efficiency improved. Report the two numbers separately instead.
- Reading a low multiple as good growth. Low-margin, heavily discounted, concentrated or fast-churning ARR can be cheap to add and still destroy value.
When does the burn multiple break?#
When net new ARR is zero or negative. The metric is undefined pre-revenue and misleading in contraction. Craft Ventures' own marketplace example shows the failure mode concretely: a seasonal dip produced a burn multiple of −51.5, which the author instructs readers to disregard entirely.
Outside recurring revenue. Marketplaces, transactional, hardware and advertising businesses need the gross-profit denominator and a year-over-year period, precisely because quarter-over-quarter revenue is seasonal and P&L classification is subjective.
When billing terms change. Moving customers from monthly to annual prepayment reduces near-term burn without changing the economics at all. Read the multiple alongside deferred revenue, receivables and collections — see Burn Rate and Runway.
When investment and return sit in different quarters. A sales cohort hired in Q1 consumes cash in Q1 and produces ARR in Q3. Rolling and lagged views help; nothing removes the need for cohort-level payback.
When the ARR itself is the problem. The denominator inherits every weakness of your ARR policy. If expired contracts linger in ARR or variable usage is annualised optimistically, the burn multiple simply reports that optimism as efficiency. See ARR and MRR.
Frequently asked questions
01Should capital expenditure be in net burn?
For a software company, usually yes — capitalised software development is cash paid to engineers, and at Blackbaud it was 87% of total capex in FY2025. What matters more than the answer is that you state the policy and keep it stable. A quarter where the policy changed is a quarter with no comparable number.
02What is a good burn multiple?
Sacks' published rules of thumb are around 3 at seed, roughly 2 after a Series A, tighter after a Series B, and approaching 0 as the company approaches profitability; 5x is a cut-costs signal. Craft's marketplace guidance is blunter — above 2.5, consider cutting burn. Treat all of these as calibration for a conversation, not thresholds for a decision.
03What do we do when ARR shrinks?
Do not publish a negative multiple. Report net burn and the ARR decline as two separate lines, plus the churn and contraction bridge that explains the decline. A ratio with a negative denominator communicates nothing except that someone divided anyway.
04How does this differ from the Rule of 40?
The Rule of 40 adds a growth rate to a profitability margin, both as percentages of revenue. The burn multiple divides absolute cash by absolute recurring-revenue growth. Rule of 40 is a screen for scaled companies; the burn multiple works down to the first million of ARR, which is why venture boards reach for it earlier.
05Can we use it for a marketplace?
Yes, with the two documented changes: growth in annualised gross profit instead of ARR growth, and a year-over-year rather than quarter-over-quarter period where seasonality is material.
Related concepts#
- ARR and MRR — construct the recurring-revenue denominator.
- Burn Rate and Runway — define net burn and connect it to financing time.
- NRR and GRR — see how churn nets against the denominator.
- Gross Margin — test the quality of the ARR being added.
- Customer Acquisition Cost — locate the acquisition spend inside the burn.
- SaaS Magic Number — isolate the sales-and-marketing component of efficiency.
- Rule of 40 — compare growth with a defined profitability margin.
- Marketplace Model — understand why GTV is not the platform's revenue.
Sources#
- David Sacks, "The Burn Multiple", Bottom Up, 23 April 2020 (also published on the Craft Ventures Medium publication). Primary source for the formula, its derivation by inverting Bessemer's Efficiency Score, the 2x/5x calibration, the stage progression, and the statement that the ratio does not compute pre-revenue.
- Jeff Fluhr, "Applying the Burn Multiple to Marketplace Business Models", Craft Ventures, 1 June 2022. Source for the attribution of the term to David Sacks, the gross-profit denominator, the year-over-year period for seasonal businesses, the −51.5 illustration, the 35–85% versus 70–85% gross-margin ranges, and the "above 2.5, consider cutting burn" guidance.
- US Securities and Exchange Commission, Division of Corporation Finance, Non-GAAP Financial Measures Compliance and Disclosure Interpretations (Question 102.07), last updated 13 December 2022. Source for the absence of a uniform free-cash-flow definition and the requirement to describe and reconcile cash measures.
- Blackbaud, Inc., Fourth Quarter and Full Year 2025 Results, 10 February 2026. Source for the FY2025 free-cash-flow reconciliation and the capitalised software development share of capital expenditure.
- SaaS Metrics Standards Board, Annual Recurring Revenue standard; accessed 13 August 2026. Source for the point-in-time definition of the ARR base used in the denominator.
Note: This page is educational and does not constitute accounting, tax, legal, or investment advice. Net burn and ARR are unstandardised measures, and their presentation in investor materials is subject to rules that vary by jurisdiction and filing status. Consult a qualified accountant or adviser before relying on them in financing or reporting materials.
Author
Dr. Sarah Zou
Independent economist · EconNova
Commercial strategy for technical products, with a focus on pricing, unit economics, and the operating choices behind the model.
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Zou, S. (2026). Burn Multiple: Measuring the Cash Cost of ARR Growth. In Unit Economics. Pricing & Monetization Wiki. https://sarahzou.com/wiki/unit-economics/burn-multiple
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