Burn Multiple

What it measures

Net Burn (the sum of monthly operating losses across the period) divided by Net New ARR (the sum of monthly net new recurring revenue growth across the period). Both are typically summed over the most recent month, quarter, or trailing twelve months (TTM). When Net New ARR is zero or negative (flat or contracting base), Burn Multiple is expressed as infinite or undefined to flag that the company is burning cash while not acquiring or expanding revenue.

Why it matters

Burn Multiple measures efficiency of cash deployment in growth. It answers the question: "For every dollar of ARR growth I'm adding, how many dollars am I burning?" A lower Burn Multiple (e.g., 2.0x) means efficient unit economics—you're spending $2 to add $1 of ARR. A higher Burn Multiple (e.g., 5.0x or 10.0x) signals profligacy or poor unit economics—money is leaving faster than recurring revenue is entering. Early-stage SaaS typically burns far less efficiently than mature SaaS, with the multiple expected to tighten steadily as the company scales and approaches cash-positive on incremental revenue. Burn Multiple is the inverse of Rule of 40—instead of growth + profitability, it's *cost* of growth.

How to read it

Read Burn Multiple as a time-series trend, not a single snapshot. If Burn Multiple is 3.0x this month and 2.5x last month, you're improving efficiency. If it's 2.0x this quarter and 4.0x last quarter, something changed—either Net Burn fell, Net New ARR grew, or both. To diagnose: break down Net Burn into OPEX buckets (R&D, S&M, G&A) and Net New ARR into new customers, expansion, and churn. A rising Burn Multiple on falling Net Burn usually means you're scaling S&M faster—revenue growth didn't keep pace. A rising Burn Multiple on shrinking Net New ARR (contraction + churn outrunning new) is dire: you're spending more to add less. Compare your Burn Multiple to stage and round: a pre-Product-Market-Fit company is expected to burn far less efficiently than a later-stage one, so a high multiple early is normal but the same multiple at a later stage signals a problem.

What good looks like

Watch-outs

• Ignoring the sign of Net New ARR. If ARR is flat or contracting, Burn Multiple becomes infinite or undefined. A company burning $2M/month on a $0 net-new-ARR base is in crisis, not 2.0x efficient. Always check that Net New ARR > 0 before interpreting Burn Multiple.
• Confusing Burn Multiple (cash-to-ARR) with CAC Payback (CAC-to-ARR). CAC Payback is (S&M spend ÷ new MRR × gross margin) / months to payback; Burn Multiple is (total cash burn ÷ all net new ARR). Burn Multiple includes all OPEX; CAC Payback isolates sales efficiency.
• Using period-end snapshots instead of rolling sums. A single month's Burn Multiple is volatile and misleading because both Net Burn and Net New ARR bounce month to month. Always use TTM or at least T3M rolling windows for stability.
• Forgetting that Burn Multiple is a flow-based ratio. A company can have a 2.0x Burn Multiple but still go bankrupt if its absolute burn rate is $10M/month and cash balance is $50M (5 months of runway). Always pair Burn Multiple with absolute cash balance, runway, and cash burn rate.

Worked example