Free FIRE Retirement Calculator — When Can You Retire?

Calculate your FIRE number, projected retirement savings, and how many years your nest egg will last.

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Retirement Details

Enter your retirement details to see your FIRE number.

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What Is the FIRE Movement?

FIRE stands for Financial Independence, Retire Early. It is a personal finance movement centered on the idea that through aggressive saving, disciplined investing, and intentional spending, ordinary people can achieve financial independence and retire decades ahead of traditional retirement age. The FIRE movement gained mainstream attention in the 2010s, partly through popular blogs, books like "Your Money or Your Life," and the influential blog Mr. Money Mustache. Today, millions of people worldwide use FIRE principles to plan their retirement strategy.

FIRE is not one-size-fits-all. The movement encompasses several variants: Lean FIRE (retiring on a very minimal budget, typically under $40,000/year), Fat FIRE (retiring with a large enough portfolio to maintain a comfortable, high lifestyle), Barista FIRE (semi-retiring with part-time work to cover some expenses), and Coast FIRE (saving aggressively early so the portfolio can grow to retirement readiness without further contributions). The calculator above helps you plan for any of these approaches.

The 4% Withdrawal Rule Explained

The 4% rule is the foundation of most FIRE calculations. It originated from the Trinity Study (1998), a landmark analysis of US stock and bond portfolio survival rates over 30-year retirement periods. The study found that a portfolio invested in a diversified mix of stocks and bonds could sustain a 4% annual withdrawal rate (adjusted for inflation) with a very high probability of lasting 30 years or more, based on historical US market data going back to 1926.

In practical terms: if you need $50,000 per year in retirement, divide $50,000 by 4% (or 0.04) to get your FIRE number of $1,250,000. Once your portfolio reaches that level, you can theoretically withdraw 4% annually, adjust for inflation each year, and historically your portfolio would have survived even the worst market sequences. For FIRE retirees planning a 40–50 year retirement (much longer than the original 30-year study), many practitioners use 3–3.5% as a more conservative withdrawal rate.

How to Calculate Your Retirement Number

The FIRE number calculation is straightforward: FIRE Number = Annual Expenses ÷ Withdrawal Rate. But understanding what goes into annual expenses requires careful planning. Consider all recurring costs: housing (rent or mortgage), food, healthcare, transportation, entertainment, travel, insurance, and taxes. Many FIRE planners use their current annual spending as a baseline, then adjust for anticipated lifestyle changes in retirement.

This calculator also projects whether your current savings rate and investment return will reach your FIRE number by your target retirement age. If there is a shortfall, it calculates the monthly savings increase needed to close the gap. These projections use standard time-value-of-money formulas: the future value of a lump sum (for current savings) and the future value of an annuity (for regular monthly contributions).

Investment Return Assumptions

The default 7% annual return in this calculator reflects a common planning assumption for a diversified investment portfolio (broadly based on historical real returns for US equity index funds, net of inflation). Some planners use 10% as the nominal return and then subtract 2–3% for inflation to get the real return. Either approach is valid as long as you are consistent. For more conservative planning, use 5–6%. For aggressive scenarios, 8–9% may be appropriate if your portfolio is heavily weighted in equities.

Remember that investment returns are never guaranteed. Sequence-of-returns risk — the danger of experiencing poor returns in the early years of retirement — is one of the most significant challenges for FIRE retirees. This is why building a cash buffer (1–2 years of expenses in cash or short-term bonds) and maintaining spending flexibility are important components of a robust FIRE plan.

Frequently Asked Questions

Your FIRE number is the total portfolio value you need to retire safely based on your planned annual spending and withdrawal rate. The formula is: FIRE Number = Annual Expenses ÷ Withdrawal Rate. With a 4% withdrawal rate and $60,000 in annual expenses, your FIRE number is $1,500,000. Once your portfolio reaches this target, your investments can theoretically support your lifestyle indefinitely — you no longer need employment income to cover expenses.

The 4% rule has faced criticism in recent years due to lower expected future returns and longer retirement horizons. Many financial researchers now suggest 3.3–3.5% as a safer withdrawal rate for very long retirements (40+ years) or in lower-return environments. However, the 4% rule remains a useful planning benchmark. FIRE practitioners often build in additional safety margins: geo-arbitrage (living in lower-cost regions), part-time income, flexible spending cuts during market downturns, or side income from hobbies.

Social Security can significantly reduce your required FIRE number, but it typically doesn't begin until age 62–70 in the United States. For early retirees in their 30s or 40s, there may be a gap of 20–30 years before Social Security kicks in. Many FIRE planners model two phases: a pre-Social Security phase requiring full portfolio withdrawals, and a post-Social Security phase with reduced portfolio dependence. The UK equivalent is the State Pension, available from age 66; Australia's Superannuation becomes accessible at preservation age (currently 60).

The higher your savings rate, the faster you reach FIRE. A classic FIRE analysis shows that saving 10% of income leads to roughly 40 years of working life; saving 50% leads to retirement in about 17 years; saving 75% means retirement in about 7 years. This is because a higher savings rate simultaneously grows your portfolio faster and reduces the annual spending amount that determines your FIRE number. The most powerful lever in FIRE is not investment returns — it is the savings rate.

If this calculator shows a shortfall, you have several options: increase your monthly contributions, delay retirement age, reduce planned retirement expenses (which also lowers your FIRE number), increase your investment return through portfolio adjustments, or pursue a Barista FIRE approach with part-time income. The "Monthly Savings Needed" figure in the results shows exactly how much more you would need to save monthly to hit your FIRE number by your target retirement age.

Healthcare is one of the biggest challenges for early retirees in the US, where employer-sponsored health insurance ends at retirement. Options include: ACA marketplace plans (premiums depend on income, so strategic income management can reduce costs), health sharing ministries, COBRA (expensive, short-term), or relocating to a country with public healthcare. In the UK and Australia, the public healthcare system (NHS and Medicare respectively) largely removes this concern for retirees. Budget at least $5,000–$15,000/year per person for healthcare costs in your US retirement expense estimate.

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