Calculate Burn Multiple Correctly—Capex Can Turn 2.33x Into 2.58x

Calculate burn multiple by dividing net cash burn for a period by the increase in annual recurring revenue (ARR) over that same period. David Sacks’s definition of the ratio is net burn ÷ net-new ARR: cash consumed per additional dollar of annualized recurring revenue.

The cash boundary matters as much as the matching dates. In a worked SaaS quarter, $2.8 million of burn divided by $1.2 million of net-new ARR gives 2.33x; including a $0.3 million server purchase raises burn to $3.1 million and the result to 2.58x. The ARR growth is identical. Each result answers a different cash question, so the capex policy belongs beside the number.

Build the ARR bridge

Use opening and closing ARR balances for the period being measured. A spreadsheet bridge is: opening ARR + new-customer ARR + expansion ARR − contraction ARR − churned ARR + acquired ARR ± currency adjustment = closing ARR. The closing balance minus the opening balance is the total change in ARR. Keeping every component visible shows whether growth came from new sales, existing customers or an acquisition.

For a measure of organic growth, subtract acquired ARR and other nonorganic changes from the total change. An acquisition can lift closing ARR without showing that the existing business generated it. Currency movements can also change a reported balance without reflecting a change in customer contracts; keep those effects separate when they are material.

ARR is an annualized balance, but net-new ARR is the change between two balances. Do not multiply a quarterly change by four. Quarterly recognized revenue, bookings and new-customer ARR are different quantities. Using new-customer ARR alone would miss the loss of recurring revenue from customers who contracted or churned, making the denominator too large and the multiple appear too low.

Reconcile cash and declare the capex policy

Start with opening cash minus closing cash, then remove financing effects. A simple spreadsheet line is: opening cash − closing cash + equity proceeds + debt proceeds − debt-principal repayments = cash consumed outside financing. A loan draw or equity raise increases closing cash, so ignoring it understates consumption. Debt repayment has the opposite effect. Include any other material financing inflows or outflows in the same reconciliation.

The SEC’s cash-flow guide separates operating, investing and financing activity; it places purchases of long-term equipment in investing and borrowing in financing. That separation explains why a cash-balance change and operating cash flow alone can give different burn figures. Reconcile changes in the cash balances counted, and identify material investing flows such as acquisitions or asset sales before treating the result as operating-plus-capex burn.

Under an operating-cash policy, use operating cash consumption and exclude equipment purchases and capitalized software payments recorded in investing activity. Under an operating-plus-capex policy, add those cash payments because they still fund the business. The second policy should not silently include purchases of another company or financial assets merely because they also appear in investing activity. State the treatment of interest, restructuring payments and acquisition consideration if they materially affect the numerator.

Keep the sign of the cash result. Positive burn means cash was consumed within the stated boundary; negative burn means cash was generated. A change in capex policy between periods can create an apparent improvement or deterioration even when the underlying cash flows are unchanged.

Calculate the same quarter both ways

In the illustrative quarter, ARR starts at $8.0 million. New customers add $1.4 million and existing customers expand by $0.4 million; contraction removes $0.2 million and churn removes $0.4 million. The bridge closes at $9.2 million, leaving $1.2 million of net-new ARR: $1.4 million + $0.4 million − $0.2 million − $0.4 million. Closing ARR minus opening ARR gives the same check.

Cash starts at $10.0 million and ends at $7.4 million. The company drew $0.5 million on an equipment loan, so the $2.6 million fall in its cash balance understates consumption. Adding back the draw gives $3.1 million: $10.0 million − $7.4 million + $0.5 million. On a capex-inclusive basis, $3.1 million ÷ $1.2 million of net-new ARR rounds to 2.58x.

The $3.1 million includes a $0.3 million server purchase. Excluding that purchase under the operating-cash policy leaves $2.8 million of burn; $2.8 million ÷ $1.2 million rounds to 2.33x. The difference comes entirely from the numerator. Payments for capitalized software shown outside operating cash flow require the same policy decision as equipment purchases.

Adjust acquisitions and handle a denominator that breaks the ratio

Acquired ARR and acquisition cash need symmetrical treatment in an organic calculation. As a separate variation on the illustrative quarter, suppose $0.5 million of its $1.2 million ARR increase came from an acquisition and $0.9 million of its $3.1 million cash use paid for that business. Organic net-new ARR would be $0.7 million and organic burn $2.2 million, yielding 3.14x. Removing the acquired ARR alone would yield 4.43x, because the numerator would still include cash spent on the deal. If consideration was paid in shares rather than cash, there would be no cash purchase price to remove.

When net-new ARR is zero, the ratio is undefined. When ARR declines, division can produce a negative number that looks superficially better than a positive multiple; if cash generation and ARR decline are both negative, it can even produce a positive number. Neither result has the usual efficiency meaning. Report cash burn or generation, the ARR change, and the contraction and churn components separately.

Cash generation alongside rising ARR also needs a plain description. The arithmetic quotient is negative because the numerator is negative, but ranking it against positive burn multiples obscures the fact that the company added ARR while generating cash. Billing and collection timing can affect that quarter’s cash figure, so the cash bridge remains part of the result.

Interpret the result within its cash boundary

The 2024 B2B SaaS benchmark report shows 936 participants in its profile and calls burn multiples below 1x great, 1x–2x good, and above 2x concerning, especially at $20 million or more in ARR. Its description of net burn refers to cash operating expenses and cash revenue. Those bands therefore need care when applied to a calculation that also includes capex.

• Below 1x: Less than one dollar of measured cash burn per dollar of net-new ARR; the cash boundary and quality of the ARR still matter.
• 1x–2x: A favorable reference range in the cited venture-backed SaaS guidance, provided the inputs use comparable definitions.
• Above 2x: Separate the effects of cash spending, slower new sales, contraction and churn before attributing the increase to one cause.
• Zero or negative net-new ARR: Show the cash and ARR bridges separately instead of applying a positive-multiple benchmark.

A single quarter can place spending before the ARR it helps produce. A sequence of periods calculated under the same cash and ARR policies is more informative than an isolated figure: it shows whether a change came from consumption, recurring-revenue growth or a disclosed change in measurement.