Magic Number for AI/ML at Seed
2026 data · Sample size: 361 · Source: ChartMogul SaaS Growth Report 2025
About This Metric
Sales efficiency metric. Revenue growth per dollar of sales and marketing spend. Above 0.75 means accelerate spending.
Higher is better · Unit: ratio
How to Improve
Ehsan's Analysis
The Magic Number for AI companies is misleading because a large portion of "sales & marketing spend" should actually be classified as "model development and inference cost." If your AI company spends $500K on marketing and $500K on inference costs for free-tier users, your true acquisition spend is $1M, not $500K. The AI-adjusted Magic Number: (net new ARR) ÷ (S&M spend + free-tier inference costs + trial inference costs). By this calculation, most AI companies have magic numbers of 0.2-0.4 — well below the healthy SaaS threshold. The AI companies with healthy adjusted magic numbers (Canva AI, Grammarly) achieved it by: (1) keeping free-tier inference costs under $2/user/month through small models, and (2) converting free users to paid within 30 days before inference costs accumulate. The AI magic number lesson: free-tier costs ARE acquisition costs. If you are not tracking them as such, your go-to-market efficiency is worse than you think.
Ehsan Jahandarpour
AI Growth Strategist & Fractional CMO
Forbes Top 20 Growth Hacker · TEDx Speaker · 716 Academic Citations · Ex-Microsoft · CMO at FirstWave (ASX:FCT) · Forbes Communications Council