Article · 8 min read

How to Calculate the Inference Efficiency Ratio

Ben Murray · The SaaS CFO Free Advanced

One metric you can start tracking this month: AI product revenue divided by inference cost. It moves before your gross margin does, which makes it the early warning you want rather than the postmortem you get from the P&L.

  • Inference efficiency ratio is AI product revenue divided by inference cost for the same period.
  • For AI infused SaaS, 8:1 is the floor and 10:1 or better is healthy, below 5:1 is a warning.
  • For AI native products the healthy zone is 5:1 or better, since inference is structurally about 20 percent of revenue.
  • Unlike gross margin, which lags, IER is a leading signal: model routing, prompt caching and tiered pricing moved one example from 4.4:1 to 8.0:1 at the same revenue.
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The question it answers

  1. My AI features cost real money every time someone uses them. How do I stop gross margin from collapsing?

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