FIRE & Retire · Lean

Lean FIRE Calculator — Freedom, lean.

Lean FIRE is financial independence on a frugal budget — a smaller number, reached sooner, if you live light.

What you enter

  • Lean expenses
  • Progress
  • Invested / yr

How this is calculated

Identical maths to the FIRE calculator — expenses ÷ withdrawal rate, portfolio simulated to the crossing point — but framed around a deliberately frugal budget, which shrinks the target and the timeline.

Common questions

What budget counts as Lean FIRE?

Commonly, annual spending well under the typical household's — in Australia, roughly $40,000 or less for a single. At 4%, a $35,000 budget needs $875,000; every $1,000 trimmed from annual spending removes $25,000 from the target.

What's the catch?

No slack. A frugal budget has little room to absorb rent shocks, health costs or inflation running hot — and decades are long. Lean FIRE plans benefit from a paid-off home, a lower withdrawal rate, or a willingness to return to work if needed.

Lean FIRE vs regular FIRE — how do I choose?

It's a values question the maths just prices: years of extra working time versus permanent spending headroom. Run both numbers here and compare the timelines — the gap is what the lifestyle difference costs.

How does it rank?

Once you have your result, see how your number compares against your demographic with our full money rank — by age, sex, state and household composition.

Methodology & data

INDICATIVE · 4% RULE. Australian context, FY 2026–27 tax brackets by default (15% lowest marginal rate from 1 July 2026) with a financial-year selector on tax calculators. Calculations are indicative and based on simplified public models — not personal financial, tax or legal advice. See the full disclaimer.

Primary data sources

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