SaaS Spend Efficiency Ratio Calculator
The Spend Efficiency Ratio (SER) divides net new ARR by net cash burn. It tells investors how much growth you buy with each dollar of burn. A ratio of 1.0 means each dollar burned produced a dollar of new ARR — the standard threshold for healthy SaaS in 2026.
What Spend Efficiency Ratio Measures
SER is a stricter cousin of the magic number that uses net burn (cash out the door) instead of S&M spend. It captures whether the entire company — including R&D, G&A, and infrastructure — is generating proportional ARR.
Why The Benchmark Shifted Post-2022
In the ZIRP era SaaS investors tolerated SER below 0.5 if growth was above 100%. Post-2022 the bar rose: Bessemer's 2026 framework expects SER above 1.0 even for hyper-growth, with elite at 1.5+.
Levers To Improve SER
Three highest-impact moves: cut payback period through tighter sales targeting, raise gross margin via infrastructure cost rationalisation, and reduce churn through retention-focused product investment. R&D cuts rarely improve SER long-term because they erode future expansion.
Source: Bessemer Venture Partners State of the Cloud 2026, OpenView SaaS Benchmarks. Last updated: May 2026.