Barista FIRE Calculator Formula

Understand the math behind the barista fire calculator. Each variable explained with a worked example.

Use the Barista FIRE Calculator

Formulas Used

Barista FIRE Number

barista_fire_number = withdrawal_rate > 0 ? gap / (withdrawal_rate / 100) : gap * 25

Annual Income Gap

income_gap = gap

Surplus/Deficit

surplus_deficit = current_savings - (withdrawal_rate > 0 ? gap / (withdrawal_rate / 100) : gap * 25)

Annual Portfolio Income

portfolio_income = current_savings * withdrawal_rate / 100

Variables

VariableDescriptionDefault
annual_expensesAnnual Living Expenses(USD)50000
part_time_incomePart-Time Annual Income(USD)20000
current_savingsCurrent Savings(USD)400000
withdrawal_rateSafe Withdrawal Rate(%)4
gapDerived value= max(annual_expenses - part_time_income, 0)calculated

How It Works

Barista FIRE

Barista FIRE (named after the idea of working at a coffee shop for health insurance) is a semi-retirement strategy.

How It Works

1. Save enough so portfolio withdrawals + part-time income cover expenses 2. Quit your high-stress career 3. Work a lower-paying job you enjoy for spending money and benefits

Formula

Barista FIRE Number = (Annual Expenses - Part-Time Income) / Withdrawal Rate

Benefits

  • Freedom from demanding career much earlier
  • Part-time work provides structure and social connection
  • Employer benefits (health insurance) from part-time job
  • Portfolio continues growing during part-time years

    • Worked Example

    $50,000 expenses, $20,000 part-time income, $400,000 saved, 4% withdrawal rate.

    annual_expenses = 50000part_time_income = 20000current_savings = 400000withdrawal_rate = 4
    1. 01Income gap = $50,000 - $20,000 = $30,000
    2. 02Barista FIRE number = $30,000 / 4% = $750,000
    3. 03Current savings ($400,000) vs target ($750,000)
    4. 04Deficit = $400,000 - $750,000 = -$350,000 (not there yet)

    Frequently Asked Questions

    What jobs work well for Barista FIRE?

    Jobs offering health insurance for part-time workers: Starbucks, Costco, UPS, and REI are well known. Other options include substitute teaching, seasonal work, freelancing, tutoring, or any flexible work you enjoy.

    Is 4% a safe withdrawal rate for Barista FIRE?

    Since you have part-time income as a buffer, the 4% rule is arguably even safer for Barista FIRE than full retirement. If the market drops, you can temporarily increase work hours instead of drawing down your portfolio.

    How is Barista FIRE different from Coast FIRE?

    Coast FIRE means you stop saving and let compound growth reach your retirement target by a future date. Barista FIRE means you start withdrawing now (in semi-retirement). Barista FIRE requires more saved upfront.

    Ready to run the numbers?

    Open Barista FIRE Calculator