How the FIRE Number Is Calculated
If you've spent any time in personal finance circles, you've heard it: "$1 million" — the number that supposedly unlocks financial freedom. Plenty of personal finance gurus repeat it like gospel, as if a single figure applies equally to everyone, everywhere.
Here's how that number is usually worked out, based on the well-known 4% rule — the idea that you can safely withdraw 4% of your liquid investments each year without running out of money:
Annual Expenses × 25
Multiply your yearly expenses by 25, and you get the amount you'd need invested to sustain that spending indefinitely. Simple, clean, and treated as universal — except it isn't. Your real FIRE number depends on where you live, how you live, and how you expect your relationship with money to change over time. You can run your own numbers using FinCalc's Compound Interest Calculator to see how a target portfolio grows toward that figure.
Same Formula, Three Very Different Realities
Below are three examples from different locations — notice the stark difference. All examples assume the person already owns the place they live in.
- 🇵🇰 Pakistan — $1080/month (≈300,000 PKR) in expenses: $1080 × 12 = $12,960/year × 25 = $324,000
- 🇬🇧 United Kingdom — $3,350/month (≈£2,500) in expenses: $3,350 × 12 = $40,200/year × 25 = $1,005,000
- 🇦🇪 Dubai — $5,500/month (≈20,000 AED) in expenses: $5,500 × 12 = $66,000/year × 25 = $1,650,000
That's a spread from $324,000 to $1,650,000 — nearly 5x apart — using the exact same formula and the exact same 4% rule, just applied to different costs of living.
Why Location (and Lifestyle) Changes Everything
The math itself isn't wrong — but treating the output as a universal target is. A FIRE number is only ever a reflection of the expenses you plug into it, and those expenses are shaped by your city, your housing costs, and your day-to-day lifestyle.
This also doesn't account for lifestyle inflation. Someone chasing a more luxurious standard of living in any of the three locations above will push their number higher still, regardless of where they live.
So the next time someone tells you FIRE requires "a million dollars," the real question is: a million dollars — for whose expenses, in which city, at what standard of living?