Question 1

What is a FIRE Calculator?

Accepted Answer

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.

Question 2

How does the FIRE Calculator work?

Accepted Answer

Calculate annual expenses: everything you spend per year in retirement Then: FIRE number = Annual expenses × 25 (using the 4% safe withdrawal rate) Then: The 4% rule is derived from the Trinity Study showing a diversified portfolio survives 30+ years at 4% withdrawal Then: Lean FIRE: frugal lifestyle, smaller number | Fat FIRE: comfortable lifestyle, larger number.

Question 3

Can you give an example of how to use the FIRE Calculator?

Accepted Answer

Example: Input £30,000 annual expenses gives a result of FIRE number: £750,000 (30,000 × 25 = £750,000).

Question 4

Is the FIRE Calculator free to use?

Accepted Answer

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

Question 5

How accurate is the FIRE Calculator?

Accepted Answer

Our FIRE Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

FIRE Calculator

FIRE Calculator

What is FIRE Calculator?

How to Use FIRE Calculator

Example FIRE Calculator

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