FIRE Calculator: How Many Weeks Until You Can Retire Early?
FIRE in Weeks, Not Dollars
The FIRE movement has a clean framework: save 25× your annual expenses, invest it in index funds, and withdraw 4% per year forever. The math works. The problem is that most people track FIRE in dollars, not in weeks of life.
But dollars are abstract. Weeks are not.
If your FIRE number is $1,000,000 and you're currently at $200,000 saving $30,000/year, you're 26.7 years away. That's 1,391 weeks of Monday-morning commutes before freedom.
Or maybe you can cut expenses, increase income, and get there in 800 weeks. Which matters more — the dollar milestone, or the weeks you'd get back?
How the 4% Rule Works
The 4% rule comes from the 1994 Trinity Study. It found that a portfolio invested 50/50 in stocks and bonds could sustain a 4% annual withdrawal for 30 years in nearly all historical scenarios.
Your FIRE number = Annual expenses × 25
Examples:
- $40,000/year expenses → $1,000,000 FIRE target
- $60,000/year expenses → $1,500,000 FIRE target
- $30,000/year expenses → $750,000 FIRE target
The lever most people underestimate: cutting $10,000 from annual expenses reduces your FIRE number by $250,000 and immediately makes your current savings worth more.
The Savings Rate Is Everything
The weeks-to-FIRE calculation is driven primarily by your savings rate:
| Savings Rate | Years to FIRE | Weeks to FIRE |
|---|---|---|
| 10% | ~51 years | ~2,652 weeks |
| 25% | ~32 years | ~1,664 weeks |
| 50% | ~17 years | ~884 weeks |
| 75% | ~7 years | ~364 weeks |
Notice how non-linear this is. Going from 25% to 50% savings rate doesn't halve the time — because savings rate simultaneously increases what you invest AND decreases your FIRE target.
FIRE by Job and Country
The weeks-to-FIRE calculation looks wildly different depending on your profession and where you live:
- A software engineer in San Francisco earning $180k may hit FIRE in 12–15 years (624–780 weeks)
- A teacher in a high cost-of-living city might need 30+ years (1,560+ weeks)
- The same teacher in Portugal, where $2,500/month covers a comfortable life, might get there in 18 years (936 weeks)
This is why geography matters in FIRE planning. The number isn't just about your salary — it's about the gap between income and local expenses.
Visualizing FIRE on Your Life Calendar
Here's what changes when you move from a spreadsheet to a visual calendar:
Before: "I'll retire at 52." (Abstract)
After: You see 52 rows in the grid. You can see exactly which weeks are between now and that row. You can see the weeks of parenting, travel, health, and relationships that will happen — or not happen — before that point.
The weeks become real. The tradeoffs become visible.
The Leanfire vs. Fatfire Spectrum
- Leanfire: Living on $25–$40k/year, often in low-cost countries. Reachable fast, requires minimalism.
- Regular FIRE: $40–$80k/year. The standard target.
- Fatfire: $80k+/year. Maximum comfort, needs $2M+ portfolios.
- Coastfire: Save a lump sum young, let compound interest carry you to retirement without additional savings.
Each translates into a different number of weeks at work. The question is: which tradeoff fits your life calendar?
Ready to run the numbers? Open the Lifeplanr FIRE Calculator →