FIRE Number Calculator
Calculate your FIRE number (25x annual expenses) and see how many years until you reach Financial Independence, based on your savings rate and expected return.
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Additional Details
Your FIRE Number
Estimated • Based on your inputs
Years to Financial Independence
18
Detailed Breakdown
Growth Over Time
Disclaimer: This calculator provides estimates for informational purposes only. Results should not be considered financial, tax, or legal advice. Consult a qualified professional for your specific situation.
How This Calculator Works
Calculation methodology and assumptions
Your FIRE number = annual retirement expenses ÷ safe withdrawal rate (the "25x rule" at a 4% SWR, since 1 ÷ 0.04 = 25). This comes from the 1998 Trinity Study, which found that withdrawing ~4% of a stock/bond portfolio in the first year of retirement, then adjusting that dollar amount for inflation each year after, had a historically high (roughly 95%) success rate over a 30-year retirement. To find years to FI, this calculator compounds your current invested assets plus monthly contributions at your expected annual return until the projected balance reaches your FIRE number.
How to Use This Investment & Retirement Calculator
- 1
Fill in Current Age and Annual Expenses in Retirement
Current Age starts at 30; Annual Expenses in Retirement starts at $40,000. Replace each one with your own figure.
- 2
Fill in Current Invested Assets and Monthly Contribution
Current Invested Assets starts at $50,000; Monthly Contribution starts at $2,000. Replace each one with your own figure.
- 3
Fill in Expected Annual Return and Safe Withdrawal Rate (SWR)
Expected Annual Return starts at 7%; Safe Withdrawal Rate (SWR) starts at 4%. Replace each one with your own figure.
- 4
Read the results
The calculator leads with Your FIRE Number and Years to Financial Independence, followed by 4 supporting figures.
Example Calculation
What the calculator above returns before you change anything: age 30, $40,000 of yearly spending, $50,000 invested, $2,000 added a month, a 7% return and a 4% withdrawal rate.
The FIRE number is spending divided by the withdrawal rate: $40,000 ÷ 4% = $1,000,000. What you have today is 5% of it.
Result: Growing 7% a year (compounded monthly) with the monthly deposits, the portfolio reaches it after 17.9 years, at age 47.9. By then you have added $430,000 and growth has added $523,161. The return and withdrawal rate are assumptions, not guarantees.
What Affects Your Results
Rate of Return
Even small differences compound massively over time. 7% vs. 8% over 30 years on $100K means a difference of $200K+. Asset allocation drives your expected return.
Time Horizon
Compounding accelerates exponentially. Most of your wealth is generated in the final years — a 30-year investment earns more in its last 5 years than its first 15.
Contribution Consistency
Regular monthly investments (dollar-cost averaging) smooth out market volatility and ensure you're always buying — including during dips when prices are low.
Fees & Expenses
A 1% annual fee vs. 0.1% fee on a $500K portfolio costs you $4,500/year extra. Over 30 years, high fees can consume 25–30% of potential returns. Use low-cost index funds.
Tips & Best Practices
- Start early. Thanks to compounding, $200/month invested from age 25 to 65 at 8% returns grows to ~$700K. Waiting until 35 cuts that to ~$300K — a $400K penalty for the 10-year delay.
- Don't try to time the market. Research consistently shows that time in the market beats timing the market. Missing the 10 best trading days over 20 years can halve your returns.
- Consider tax-advantaged accounts first: 401(k) (especially with employer match), IRA, HSA. These reduce your tax drag — a 25% tax bracket investor keeps more in a tax-deferred account.
- Rebalance annually. If stocks outperform and grow from 80% to 90% of your portfolio, rebalancing back to 80% locks in gains and manages risk.
- Factor in your state's tax treatment of investment income. Some states exempt certain investment income or have lower rates on capital gains.
StateCalc Team
Editorial Team
The StateCalc team builds financial calculators using data from official government sources including the IRS, U.S. Census Bureau, BLS, and state revenue departments. All formulas are validated by an automated test suite and cross-referenced against published data.
Our editorial standardsFrequently Asked Questions
What is a FIRE number?
Your FIRE number is the total invested-asset balance you need to sustain your desired annual spending in retirement indefinitely (or for a very long retirement), without running out of money. It's calculated as annual expenses ÷ safe withdrawal rate — commonly "25x your annual expenses" at the traditional 4% withdrawal rate.
What is the 4% rule and where did it come from?
The 4% rule comes from the 1998 Trinity Study, which analyzed historical U.S. stock/bond returns from 1926-1995 and found that withdrawing 4% of a portfolio in the first year of retirement, then adjusting that amount for inflation every year after, succeeded (didn't run out of money) in the large majority of 30-year periods tested. Because FIRE retirements are often much longer than 30 years, many in the FIRE community use a more conservative 3-3.5% SWR instead.
Is the 4% rule guaranteed to work?
No — it's a historically-backed guideline, not a guarantee. It was tested against a 30-year time horizon using historical U.S. market returns; a longer retirement, a period of poor early returns ("sequence of returns risk"), or unusually high inflation could all cause a 4% withdrawal rate to run out of money sooner. Many FIRE planners build in a buffer (a lower SWR, or the flexibility to reduce spending in a down market) to reduce this risk.
How is FIRE different from a normal retirement plan?
The math is the same (a target invested-asset number based on a safe withdrawal rate), but FIRE plans typically target a much younger retirement age, which means a much longer withdrawal period and less reliance on Social Security or Medicare, which aren't available until later ages.
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