FIRE Calculator
The FIRE (Financial Independence, Retire Early) calculator computes your FIRE number — the total nest egg you need to retire early and live indefinitely on investment returns. Based on the 4% rule, you need 25× your annual expenses saved.
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Tip: Every £1 you cut from annual expenses reduces your FIRE number by £25. A £200/month spending cut (£2,400/year) reduces your FIRE target by £60,000.
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