Updated · Methodology: named formula library
RAG vs Fine-Tune Cost
Compare RAG operational cost vs one-time fine-tune cost.
RAG/yr to Fine-Tune/yr = 3:2 (2 as decimal).
RAG vs Fine-Tune
RAG: ongoing inference cost (each query expensive), but always-fresh data. Fine-tune: upfront training cost, lower per-query cost, but stale knowledge. Most production teams use RAG; fine-tune only for tone/format.
Worked Example
12000 RAG/yr to 8000 Fine-Tune/yr
- a
- 12000
- b
- 8000
- Result
- 3:2 (1.50)
12000 / 8000 = 1.50. Simplified: 3:2.
When to Use This Calculator
- Architect AI systems on cost
Limitations & Common Mistakes
- Results are estimates from your inputs.
- Verify with current data for major decisions.
Frequently Asked Questions
How is the RAG vs Fine-Tune Cost computed?
RAG/yr divided by Fine-Tune/yr, plus a simplified ratio (e.g., 4:3) using greatest common divisor. Both decimal and ratio forms are useful in different contexts: decimal for math, ratio form for comparisons or recipe scaling.
What does RAG/yr:Fine-Tune/yr mean?
It's a comparison: for every Fine-Tune/yr unit, you have a corresponding amount of RAG/yr. Useful when the absolute numbers matter less than the proportion (e.g., reading 8:1 LTV/CAC immediately tells you the unit economics are healthy without needing the dollar amounts).
Why simplify the ratio?
4:3 is more readable than 200:150. The simplified form (using greatest common divisor) preserves the proportion while making it easier to interpret. Common simplified ratios: 16:9 (widescreen), 4:3 (legacy displays), 3:1 (LTV:CAC for SaaS).
When is a ratio more useful than the absolute values?
Comparison across scales. A $1B company and a $1M company can both have a 3:1 LTV:CAC; the ratio reveals comparable unit economics regardless of scale. Use ratios for benchmarking; use absolute numbers for budgeting.
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