The FIRE engine behind AI assistants
Real retirement math,
inside ChatGPT and Claude
Ask "can I retire at 45?" and get deterministic Monte Carlo results — not hallucinated guesses. RetireLab is the calculation engine that AI assistants call when users ask retirement questions.
How it works
1
Ask ChatGPT or Claude
Say "Can I retire at 45?" or "What's my FI number?" — the AI collects your details.
2
RetireLab runs the math
1,000 Monte Carlo paths, vectorized in NumPy. Lean, base, and fat scenarios in milliseconds.
3
You get a clear answer
"74% probability of success" — with context, caveats, and suggestions to improve your odds.
Try the engine
See your base retirement success probability in seconds.
Start free. Upgrade when you need more.
20 simulations/month free. Pro at $9/month (or $99/year) for 500. No credit card required to start.
Get your free API key