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FIRE Number

Your FIRE number is how much you'd need invested so your portfolio can pay your yearly expenses instead of your boss.

I know my expenses per…
$
What you expect to spend per year once you stop working.
%
4% is the classic rule of thumb. 3–3.5% is more conservative for long retirements.
Your FIRE number
$1,000,000
Annual expenses
Monthly expenses
Multiplier
At 3.5% instead

How it works

FIRE number = annual expenses × (100 ÷ withdrawal rate). At a 4% withdrawal rate that's 25× your annual spending, so $40,000 a year means $1,000,000 invested.

The 4% figure comes from historical research like the Trinity study, which looked at how much people could withdraw from a stock/bond portfolio (adjusting for inflation each year) without running out over about 30 years. It's a rule of thumb, not a promise. Early retirees planning for 40+ years often use a lower rate, which means a bigger number.

Use what you'll spend in retirement, including things work currently pays for, like health insurance.

Educational only, not financial advice. These are simplified estimates using constant returns. Real markets are bumpy, and taxes, fees and inflation vary.