What savings rate do I need to retire in 10 to 15 years?

To reach financial independence in 10 years at a 7% return and 4% withdrawal rate, you need approximately a 65% to 70% savings rate. For 15 years, approximately 50% to 55%. These rates are achievable for dual-income households with moderate housing costs and controlled lifestyle inflation, but require deliberate prioritization. The exact rate depends heavily on your current portfolio balance and expected investment returns.

What is the difference between FIRE, Lean FIRE, and Fat FIRE?

FIRE typically targets $40,000 to $60,000/year in retirement spending ($1 to $1.5 million portfolio). Lean FIRE is below $40,000/year (portfolio below $1 million) with a more frugal lifestyle. Fat FIRE targets $100,000+ annually ($2.5 million+ portfolio) allowing a full lifestyle without spending compromise. Barista FIRE or Coast FIRE are intermediate approaches combining a smaller portfolio with part-time income to bridge the gap.

Should I use a 3.5% or 4% withdrawal rate for FIRE planning?

For early retirement (ages 40 to 55) with a 40 to 50 year horizon: 3.3% to 3.7% is the range most financial planners recommend. The lower rate builds a larger margin for sequence-of-returns risk. If you have spending flexibility (ability to reduce withdrawals in down markets), the flexibility itself functions like a lower withdrawal rate -- allowing you to target 3.7% to 4.0% more safely.

Investment & WealthPopular

FIRE Number Calculator

Calculate your Financial Independence, Retire Early number, years to FIRE, savings rate, and Coast FIRE target.

FIRE Planning

Annual Expenses in Retirement ($)

Current Savings / Investments ($)

Annual Savings / Contributions ($)

Annual Gross Income ($)

Withdrawal Rate (%)

Expected Return (%)

Your FIRE Plan

Enter your financial details and click calculate.

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Introduction

Financial Independence, Retire Early is built on one equation: your FIRE number equals your annual expenses divided by your withdrawal rate. At a 4% withdrawal rate, every $40,000 in annual spending requires $1,000,000 in invested assets. That relationship is mathematically precise. What most FIRE calculators get wrong is the path to that number -- how many years it actually takes depends almost entirely on your savings rate, not your income. A person earning $120,000 and spending $90,000 saves 25% and reaches FIRE in approximately 32 years. A person earning $70,000 and spending $35,000 saves 50% and reaches FIRE in approximately 17 years -- with a lower FIRE number to boot. The Mr. Money Mustache savings rate analysis popularized this relationship, and the underlying math from the Financial Samurai's FIRE data substantiates it with historical portfolio simulations. This calculator computes your FIRE number, years to financial independence, Coast FIRE number, and exact savings rate from your actual income and expense inputs.

What This Calculator Does

This FIRE number calculator determines: (1) your FIRE number -- the portfolio size needed to sustain your annual retirement expenses indefinitely at your chosen withdrawal rate; (2) years to FIRE -- how many years until your savings and investment growth reach your FIRE number; (3) your current savings rate; and (4) your Coast FIRE number -- the amount already saved that will grow to your FIRE number by traditional retirement age without any additional contributions. Enter your annual income, annual expenses, current portfolio value, and expected annual return.

The Formula

FIRE Number = Annual Expenses / Withdrawal Rate | Coast FIRE = FIRE Number / (1 + Annual Return)^Years to Traditional Retirement | Savings Rate = (Income - Expenses) / Income

The FIRE number is the portfolio size that, at your withdrawal rate, generates enough annual income to cover expenses indefinitely. At 4%, dividing annual expenses by 0.04 equals 25 times annual expenses -- the standard FIRE multiple. Years to FIRE is calculated iteratively: starting from your current portfolio, add annual savings and apply investment return each year until the balance reaches your FIRE number. Coast FIRE is the present value of your FIRE number discounted at the investment return rate over the years remaining to traditional retirement age (65) -- meaning if you have this amount already, investment growth alone will reach your FIRE number by 65 with no additional contributions.

Step-by-Step Example

Calculate your FIRE number

Annual retirement expenses: $45,000. Withdrawal rate: 4.0%. FIRE number: $45,000 / 0.04 = $1,125,000. This is the portfolio you need to retire indefinitely at $45,000/year.

Determine your current position

Annual income: $85,000. Annual expenses: $55,000. Annual savings: $30,000. Savings rate: 35.3%. Current portfolio: $180,000.

Calculate years to FIRE

Expected return: 7%. Year 1: $180,000 x 1.07 + $30,000 = $222,600. Year 2: $222,600 x 1.07 + $30,000 = $268,182. Continue until balance reaches $1,125,000. At these inputs: approximately 18 years to FIRE at age 50 (if age 32 today).

Calculate Coast FIRE number

Years from today to traditional retirement (age 65): 33 years. Coast FIRE: $1,125,000 / (1.07)^33 = $1,125,000 / 8.99 = $125,139. If your portfolio is already $125,139, investment growth alone will reach $1,125,000 by age 65 with no additional contributions.

Real-World Use Cases

Classic FIRE (Full Financial Independence)

A couple in their 30s with $95,000 combined income, $42,000 in annual spending, and $230,000 saved calculates their FIRE number at $1,050,000 (4% withdrawal on $42,000). At a 56% savings rate and 7% return: approximately 13 years to FIRE at age 46. A small increase in annual spending from $42,000 to $52,000 pushes the FIRE number to $1,300,000 and extends the timeline by 4 years -- demonstrating how spending choices compound into years of work.

Barista FIRE or Semi-Retirement

An investor aiming to reduce to part-time work at 48 will earn $18,000/year in flexible income. Their total spending is $55,000, so the portfolio needs to cover only $37,000. FIRE number: $37,000 / 0.04 = $925,000. By reducing the gap the portfolio must cover by $18,000, the FIRE number drops $450,000 -- taking years off the timeline.

Coast FIRE for Mid-Career Assessment

A 42-year-old with $400,000 saved and a FIRE number of $1,500,000 calculates their Coast FIRE: $1,500,000 / (1.07)^23 = $1,500,000 / 4.74 = $316,456. They have already passed their Coast FIRE number at $400,000 -- meaning they could stop all additional retirement contributions and their portfolio will still grow to $1,500,000 by age 65. They continue contributing to retire earlier than 65, but the pressure is off.

Comparison

Savings Rate	Years to FIRE (7% return, 4% withdrawal)	Required Annual Income Multiple	Monthly Savings on $80K income
10%	~43 years	25x expenses	$667
20%	~37 years	25x expenses	$1,333
30%	~28 years	25x expenses	$2,000
40%	~22 years	25x expenses	$2,667
50%	~17 years	25x expenses	$3,333
60%	~12 years	25x expenses	$4,000
70%	~9 years	25x expenses	$4,667

Common Mistakes to Avoid

Underestimating annual expenses in retirement. The largest budget categories that change in retirement are healthcare (often dramatically increases before Medicare at 65) and discretionary spending (travel tends to increase in early retirement). A common error is projecting current working-years spending without adjusting for these shifts.
Using a 4% withdrawal rate for a 40 to 50 year retirement horizon. The Trinity Study's 4% rule was designed for 30-year retirements. FIRE retirees in their 30s or 40s should model 3.3% to 3.5% to account for the longer time horizon and increased sequence-of-returns risk.
Not accounting for taxes on retirement withdrawals. Traditional 401(k) and IRA withdrawals are taxed as ordinary income. FIRE investors with significant pre-tax savings may face higher-than-expected effective tax rates in retirement, particularly before age 65 when Social Security income begins.
Ignoring inflation on expenses. $45,000 in annual spending today becomes $85,000 in 25 years at 2.6% average inflation. FIRE projections must account for inflation on both the withdrawal amount and the required portfolio size.

Frequently Asked Questions

Accuracy and Disclaimer

FIRE calculations are projections based on user inputs and simplified assumptions including constant annual returns and inflation rates. Actual outcomes depend on market performance, sequence of returns, inflation variability, healthcare costs, tax law changes, and changes in spending patterns. This calculator does not account for Social Security income, pension income, or other guaranteed income sources. Early retirement involves significant financial risks. This is an educational planning tool, not personalized financial advice. Consult a certified financial planner for comprehensive retirement planning.

Conclusion

The years-to-FIRE calculation is most sensitive to your savings rate, not your income. Every increase in the gap between income and spending -- whether from earning more or spending less -- dramatically shortens the timeline. After computing your FIRE number and path, use the Safe Withdrawal Rate Calculator to stress-test whether your FIRE number holds up under different return and inflation scenarios. The Net Worth Tracker Calculator tracks your progress toward your FIRE number as your portfolio grows.