Calculate your FIRE number and early retirement. Covers LeanFIRE, FatFIRE, BaristaFIRE and CoastFIRE with 4% rule and sequence risk guidance. Calculator4U.
Calculate when you can achieve Financial Independence and Retire Early.
A FIRE calculator determines your Financial Independence number — the invested portfolio size at which you can retire early and never need a paycheck again — using the 4% rule: FIRE Number equals Annual Expenses multiplied by 25. Spending $50,000 per year requires $1,250,000. Spending $80,000 per year requires $2,000,000. For early retirees planning 40 to 50 year retirements well beyond the 30-year Trinity Study horizon, most FIRE practitioners use a more conservative 3 to 3.5% withdrawal rate — multiplying expenses by 28.5 to 33 rather than 25. Use Calculator4U to find your FIRE number and see exactly how many years of disciplined saving stand between you and financial freedom.
Savings rate is the single most powerful variable in FIRE — more impactful than investment returns. Saving 50% of your income requires approximately 17 years to reach FIRE regardless of salary. Saving 70% takes 8 to 9 years. Every percentage point increase in savings rate simultaneously grows your portfolio faster and reduces the FIRE number you need to hit. The fastest path to FIRE combines aggressive saving with geographic arbitrage — living in a lower-cost area or country to reduce expenses dramatically. Sequence of returns risk is the biggest threat once you stop working: a severe market downturn in your first years of retirement can permanently damage your portfolio in ways later recoveries cannot fully repair. Mitigate this by maintaining 1 to 2 years of living expenses in cash and using a flexible spending approach that reduces withdrawals during down markets.
FIRE Number equals annual expenses multiplied by 25, derived from the inverse of the 4% safe withdrawal rate. Spending $50,000 per year requires a $1,250,000 FIRE number. For early retirees planning 40 to 50 year retirements beyond the 30-year Trinity Study horizon, use 3 to 3.5% withdrawal rate — multiplying expenses by 28.5 to 33 rather than 25 for a meaningful safety margin. The 25x rule is the floor, not the ceiling, for early retirement planning.
The 4% rule comes from the 1994 Trinity Study which analyzed rolling 30-year retirement periods from 1925 onward. It found a 60% stock and 40% bond portfolio using 4% initial withdrawal adjusted annually for inflation survived 95% of all 30-year periods. Critical limitation for FIRE: the study modeled 30-year retirements. A 35-year-old FIRE retiree needs their portfolio to last 50 to 60 years — requiring a more conservative 3 to 3.5% withdrawal rate for comparable survival odds. The 4% rule also assumes flexible spending, not rigid withdrawals regardless of market conditions.
To reach a $1,250,000 FIRE number in 10 years starting from $0 at 7% return, save approximately $7,200 per month or $86,400 per year. Starting with $200,000 already saved, you need approximately $5,400 per month. Starting with $500,000, approximately $2,900 per month. The faster route is reducing your annual expenses — lowering spending from $50,000 to $40,000 cuts your FIRE number from $1,250,000 to $1,000,000, shaving 2 to 3 years from your timeline without earning a dollar more.
Sequence of returns risk is the danger that a severe market downturn in the early years of retirement permanently damages your portfolio in ways later recoveries cannot repair. If markets drop 40% in year one and you continue withdrawing 4%, you sell more shares at depressed prices — permanently reducing shares available to recover. Mitigate by keeping 1 to 2 years of expenses in cash, using a flexible spending plan that cuts 10 to 20% in down market years, and using a 3 to 3.5% withdrawal rate rather than 4%
BaristaFIRE reduces your required portfolio by combining investment income with part-time earnings. Example: you need $1,500,000 to fully FIRE at $60,000 annual spending. But earning $20,000 from part-time work means you only need $40,000 from investments — requiring only $1,000,000 invested and retiring 3 to 5 years sooner. Part-time work at a company like Starbucks often includes health insurance benefits — solving the biggest US early retirement challenge of pre-Medicare healthcare coverage.
CoastFIRE is when your invested portfolio will grow to your full FIRE number by traditional retirement age without any additional contributions. A 30-year-old with $200,000 invested at 7% real returns already has enough to coast to approximately $1,000,000 by age 65. CoastFIRE number equals full FIRE number divided by (1 plus return rate) to the power of years until traditional retirement. Once you hit your Coast number, you only need to earn enough to cover current living expenses — the pressure to aggressively save disappears.
Healthcare is one of the most underestimated US early retirement expenses. Private health insurance before Medicare eligibility at 65 costs $5,000 to $20,000 per year for a family depending on age and coverage level. A 45-year-old couple can expect premiums of $1,000 to $2,500 per month for an ACA marketplace plan before subsidies. Add $12,000 to $18,000 per person per year to your annual expense estimate when calculating your FIRE number if retiring before 65. Managing taxable income strategically can qualify early retirees for significant ACA marketplace subsidies.