Calculate your path to Financial Independence, Retire Early. See exactly when you can quit work and live off your investments.
Calculate Your FIRE Number →Last updated February 2026 · 2025 IRS tax data
FIRE stands for "Financial Independence, Retire Early." It's a movement focused on aggressive saving and investing to retire decades before traditional retirement age.
Retire on a minimal budget. Typically under $40k/year spending. Requires less savings but more frugality.
Middle-class retirement lifestyle. $40-100k/year spending. Balance of savings time and lifestyle.
Retire with a luxurious lifestyle. $100k+/year spending. Requires substantial savings.
The total you need invested to sustain your lifestyle indefinitely.
How to cover expenses from early retirement until age 59½.
1,000+ scenarios to show your success probability.
Tax-efficient conversions to access retirement funds early.
Model SS benefits starting at any age from 62-70.
Plan for couples with different ages and retirement dates.
Based on the 4% safe withdrawal rate from the Trinity Study
If you spend $60,000/year, your FIRE number is $1,500,000. But this is just the starting point. BridgeToFI accounts for inflation, healthcare costs, Social Security, taxes, and market volatility to give you a more realistic picture.
The 25x formula assumes constant spending in nominal dollars. In reality, a $60,000 lifestyle today costs roughly $108,000 in 20 years at 3% inflation. It also ignores healthcare before Medicare (potentially $1,000 to $2,000 per month for a couple), taxes on retirement account withdrawals, and the fact that early retirees face 40 to 60-year retirements rather than the 30 years studied in the Trinity research. That is why BridgeToFI models inflation-adjusted spending, healthcare costs that drop at 65, progressive tax brackets, and runs 1,000+ Monte Carlo scenarios rather than relying on a single multiplier.
Sarah and James, both 45, spend $72,000 per year. Using the simple formula, their FIRE number is $1,800,000. But here is what they actually need to plan for:
BridgeToFI models all of these factors simultaneously, showing exactly which accounts fund each year and when they are at risk of running short.
The FIRE movement is not one-size-fits-all. Different variations have emerged for different lifestyles and risk tolerances.
Target: $30K to $45K/year spending
Minimalist approach. Cut expenses aggressively to reach financial independence faster. Popular with single individuals in low cost-of-living areas. The risk: very little room for unexpected expenses or lifestyle inflation. A $750K to $1.1M portfolio at 4% withdrawal rate.
Target: $50K to $80K/year spending
Maintains a middle-class lifestyle without employment income. Covers comfortable housing, travel, dining out, and some discretionary spending. Most FIRE planners target this range. Requires $1.25M to $2M at a 4% rate, or more at 3.5%.
Target: $100K+/year spending
Full lifestyle maintenance with generous discretionary budgets. Includes premium travel, dining, hobbies, and financial cushion for surprises. Requires $2.5M to $5M+ depending on spending level. Takes longer to reach but provides the most flexibility.
Target: Enough invested now to grow to FIRE by 65
Once you reach your Coast FIRE number, compound growth does the rest. You only need to earn enough to cover current expenses. A 35-year-old with $350K invested (growing at 7%) will have $2.7M by 65 without adding another dollar. This frees you to take lower-stress, more fulfilling work.
Target: Partial FIRE with part-time income
Leave your career but work part-time (the name comes from working at Starbucks for health insurance). If your portfolio covers 60% to 70% of expenses and part-time work covers the rest, you can "retire" years earlier. BridgeToFI models this using Income Streams with custom start and end dates.
BridgeToFI supports all of these approaches. Set your spending level, add part-time income streams if desired, and the calculator shows whether your plan works across thousands of market scenarios.
Your FIRE number depends entirely on your annual spending. Here are common targets at the standard 4% withdrawal rate (25x multiplier):
| Monthly Spending | Annual Spending | FIRE Number (4%) | FIRE Number (3.5%) | Category |
|---|---|---|---|---|
| $2,500 | $30,000 | $750,000 | $857,000 | Lean FIRE |
| $4,000 | $48,000 | $1,200,000 | $1,371,000 | Lean FIRE |
| $5,000 | $60,000 | $1,500,000 | $1,714,000 | Regular FIRE |
| $7,000 | $84,000 | $2,100,000 | $2,400,000 | Regular FIRE |
| $10,000 | $120,000 | $3,000,000 | $3,429,000 | Fat FIRE |
| $15,000 | $180,000 | $4,500,000 | $5,143,000 | Fat FIRE |
The 3.5% column reflects a more conservative withdrawal rate often recommended for retirements lasting 40 or more years. Many early retirees target between 3.25% and 3.5% to add a safety margin beyond the traditional 4% rule.
The 4% rule comes from the 1994 Trinity Study, which analyzed 30-year retirement periods. But early retirees face a different challenge: retirements lasting 40, 50, or even 60 years.
The classic approach. Works well for traditional 30-year retirements starting at 65. Historical success rate of approximately 95% over 30-year periods using a 60/40 stock/bond portfolio.
Better for 40 to 50-year retirements. Adds about 15% more savings but significantly reduces failure risk. Many FIRE researchers including Wade Pfau and Michael Kitces suggest this range for early retirees.
Instead of a fixed percentage, adjust spending based on portfolio performance. BridgeToFI calls these "Spending Guardrails": spend more in good years, less in bad years. This approach dramatically improves success rates.
BridgeToFI does not assume any single withdrawal rate is correct. Instead, it runs Monte Carlo simulations with 1,000+ randomized market scenarios to show the probability that your specific plan survives. This is far more useful than any single "safe" percentage.
Your savings rate matters more than your income. Someone earning $80K and saving 50% will reach FIRE faster than someone earning $200K and saving 10%.
| Savings Rate | Years to FIRE | Note |
|---|---|---|
| 10% | ~51 years | Traditional retirement timeline |
| 20% | ~37 years | Slightly ahead of schedule |
| 30% | ~28 years | Retire in your mid-50s starting at 25 |
| 40% | ~22 years | FIRE-friendly pace |
| 50% | ~17 years | Aggressive FIRE target |
| 60% | ~12.5 years | Early 30s or 40s retirement |
| 70% | ~8.5 years | Extremely aggressive |
These estimates assume 7% real returns (after inflation) and starting from $0. Having existing savings shortens the timeline significantly. The double effect of a higher savings rate is powerful: you save more while simultaneously proving you need less to live on.
Most FIRE calculators treat all your money as equally accessible. In reality, if you retire before 59.5, your retirement accounts are locked behind a 10% early withdrawal penalty. This is the "bridge problem."
Taxable brokerage accounts, savings, CDs. No age restrictions, no penalties. This is your bridge fuel. You need enough here to cover spending from retirement until age 59.5.
Roth IRA contributions (penalty-free anytime), HSA for medical expenses. Roth conversion ladder funds become accessible after a 5-year seasoning period. A critical mid-bridge resource.
Traditional 401k, IRA, 403b. The bulk of most people's savings. Penalty-free at 59.5, with exceptions through Rule of 55 and SEPP 72(t) distributions. BridgeToFI models when these unlock.
Suppose you have $2M total: $400K in a taxable brokerage (P1), $100K in Roth contributions (P2), and $1.5M in a 401k (P3). You spend $60K/year. Without a bridge strategy, you might think $2M at 4% = $80K/year, plenty of room. But your P1 only covers about 7 years of spending ($400K / $60K). You hit a wall at age 52, still 7.5 years from accessing your 401k penalty-free. BridgeToFI solves this by modeling Roth conversions (moving $40K/year from 401k to Roth, accessible after 5 years), potential SEPP distributions, and optimal withdrawal sequencing to bridge the entire gap. The result is a detailed year-by-year plan showing exactly how your money flows from each bucket.
Your FIRE number is specifically for early retirement (before 59.5), meaning you need accessible funds AND tax-advantaged accounts. Traditional retirement planning assumes you'll access 401k/IRA at 60+. BridgeToFI calculates both your total FIRE number and your bridge fund requirement, showing exactly how much needs to be accessible before 59.5 and how much can stay locked in retirement accounts.
The 4% rule was designed for 30-year retirements starting at 65. For 40 to 60-year early retirements, many experts recommend 3.25% to 3.5% to reduce failure risk. BridgeToFI goes beyond any single "safe" rate by running Monte Carlo simulations with 1,000+ randomized market scenarios, giving you an actual success probability. It also supports spending guardrails (variable withdrawals) that adapt to portfolio performance, which dramatically improves plan survival compared to rigid fixed-rate withdrawal strategies.
Medicare starts at age 65. Until then, you need private insurance or ACA marketplace coverage. Costs typically range from $500 to $2,000 per month depending on age, location, and coverage level. BridgeToFI includes a healthcare cost toggle that automatically drops off at 65. Healthcare inflation typically runs 1% to 2% above general inflation, which the calculator accounts for. Managing your MAGI is also critical for ACA premium tax credits, and Roth conversions affect this calculation.
Most retirement savings sit in 401(k) and IRA accounts that charge a 10% penalty for withdrawals before 59.5. Early retirees need "bridge" funds in accessible accounts to cover this gap. BridgeToFI uses P1 (accessible anytime), P2 (some restrictions), and P3 (after 59.5) priorities. Strategies to bridge the gap include building a taxable brokerage account, Roth conversion ladders (5-year seasoning), SEPP 72(t) distributions, and the Rule of 55. The calculator models all of these and shows exactly which accounts fund each year.
Many FIRE practitioners pursue Barista FIRE or Coast FIRE, where part-time income covers some expenses. BridgeToFI supports this through Income Streams with custom start and end dates. This reduces the portfolio size needed, extends your bridge period coverage, and can provide benefits like employer health insurance. You can model multiple income streams with different durations and amounts.
Yes. BridgeToFI includes full partner/spouse modeling with separate ages, retirement dates, Social Security benefits, and pension income. The calculator handles combined household spending and tracks when each person's income sources begin and end. Filing status (Single vs Married Filing Jointly) affects tax brackets, standard deduction amounts, and capital gains thresholds. The tool also handles scenarios where one partner outlives the other.
Taxes can add 10% to 25% to the amount you need to withdraw. A $60,000 spending need might require $68,000 to $75,000 in gross withdrawals from tax-deferred accounts. BridgeToFI offers both flat tax rate mode and full 2025 IRS progressive brackets (10% through 37%) with filing status awareness, standard deduction, and the 0% long-term capital gains bracket for brokerage withdrawals. Marginal rates are used for accurate gross-up calculations.
Avoiding these pitfalls can make the difference between a secure retirement and running out of money.
At 3% inflation, $60,000 in annual spending becomes $108,000 in 20 years and $146,000 in 30 years. Plans using nominal dollars dramatically understate future needs.
A 50-year-old couple can spend $24,000/year on ACA insurance. Over 15 years to Medicare, that is $360,000+ the simple FIRE formula ignores entirely.
Having $2M total but $1.8M locked in retirement accounts means only $200K accessible before 59.5. At $60K/year, that is barely 3 years. Roth ladders and SEPP 72(t) take years to plan.
Sequence of returns risk can destroy a plan. A 30% drop in year one of retirement shrinks your portfolio permanently. Monte Carlo simulation tests thousands of sequences, not just the average.
401(k) withdrawals are taxed as income. Using a flat 24% when your effective rate is 12% (or vice versa) creates thousands in errors per year. Progressive brackets matter for accurate projections.
Fixed withdrawal rates ignore reality. Spending guardrails that reduce spending 10% in downturns and increase it in good years dramatically improve plan survival rates.
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