Barista FIRE Calculator

Barista FIRE is a semi-retirement strategy where you leave your full-time career but continue working part-time — just enough to cover basic living expenses while your investment portfolio grows undisturbed. The name comes from the popular example of working a part-time café job for income (and health benefits) while the portfolio compounds in the background.

Core formulas:

Annual Income Gap = Annual Expenses − Part-Time Income

Barista FIRE Number = Annual Income Gap × 25

Full FIRE Number = Annual Expenses × 25

Savings Required vs. Full FIRE = Full FIRE Number − Barista FIRE Number

The multiplier of 25 comes from the 4% Safe Withdrawal Rate — research showing a diversified portfolio can sustain 4% annual withdrawals indefinitely. Dividing 1 by 4% = 25.

Variable definitions:

• Annual Expenses: your total yearly spending, including housing, food, transport, healthcare, and fun
• Part-Time Income: reliable income from a flexible low-stress job
• Income Gap: the portion your portfolio must cover each year
• FIRE Number: the portfolio size needed to fund the gap indefinitely at 4% withdrawal

Worked example: Annual expenses: $52,000 Part-time barista job income: $18,000 Annual gap = $52,000 − $18,000 = $34,000 Barista FIRE number = $34,000 × 25 = $850,000 Full FIRE number = $52,000 × 25 = $1,300,000

By taking a part-time job, you need $450,000 less in the portfolio — which could represent 5–10 fewer years of full-time work.

FIRE strategy comparison:

Key risk factor: run the numbers without the job. Part-time income is not guaranteed. Cafés close, health changes, and the flexible low-stress job you planned around may not exist when you need it. So the question worth asking is what withdrawal rate the portfolio alone would have to sustain if the income stopped.

Apply that to the example above and it is uncomfortable. The Barista number is $850,000, but without the job the portfolio has to fund the whole $52,000, which is a 6.1% withdrawal rate. That is well outside the 3 to 5% range the research supports. Barista FIRE is not a smaller version of retirement, it is retirement with a dependency, and the dependency is the part you do not control.

The calculator shows this figure on every result, so you can see how exposed the plan is before you hand in your notice. If the number comes back above 5%, the honest options are to keep working a bit longer, spend less, or accept that the part-time work is not optional.