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

The calculator uses the standard published formula for fire calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: FIRE number = Annual expenses × 25 (using the 4% safe withdrawal rate). Each step in the calculation is shown so you can verify the result manually.