FIRE Calculator for Financial Independence and Early Retirement

FIRE Calculator Inputs

Use the form below to model your financial independence timeline.

Large screens: 3 columns | Smaller: 2 | Mobile: 1

Current age

Your age today.

Desired FIRE age

The age you want to be financially independent.

Current invested portfolio

Investments already working for you.

Annual after-tax income

Used to estimate savings rate.

Annual spending today

Current yearly living expenses.

Annual portfolio contribution

Leave 0 to auto-calculate using income minus expenses.

Contribution growth rate %

Expected yearly increase in contributions.

Expected annual return %

Nominal investment growth assumption.

Inflation rate %

Used to grow future spending needs.

Safe withdrawal rate %

Often modeled around 3% to 4%.

Other yearly retirement income

Pension, rent, or other recurring income.

Example data table

Input	Example Value	Why it matters
Current age	32	Sets the starting point for your timeline.
Desired FIRE age	50	Defines the comparison year for your goal.
Current portfolio	$150,000	Existing assets compound from day one.
Annual contribution	$28,000	Fresh capital accelerates growth every year.
Annual expenses	$45,000	Helps estimate the portfolio needed for independence.
Expected return / Inflation / Withdrawal	7% / 2.5% / 4%	These assumptions shape the final FIRE target.

Formula used

1) Net retirement spending

Net retirement spending = Annual expenses − Other retirement income

2) FIRE number today

FIRE target = Net retirement spending ÷ Withdrawal rate

3) Inflation-adjusted future spending

Future spending = Net retirement spending × (1 + inflation rate)^years

4) Annual portfolio growth

Next portfolio = Current portfolio × (1 + return rate) + Annual contribution

5) Contribution growth

Future contribution = Starting contribution × (1 + contribution growth rate)^{years − 1}

6) Coverage ratio

Coverage % = Portfolio ÷ FIRE target × 100

This model is designed for planning, not a guarantee. Real returns, taxes, market volatility, healthcare costs, and lifestyle changes can alter outcomes.

How to use this calculator

Enter your current age and the age when you want financial independence.
Add your invested portfolio, income, and current annual spending.
Type your yearly portfolio contribution, or leave it as zero for an automatic value.
Adjust expected return, inflation, contribution growth, and withdrawal assumptions.
Include other retirement income if you expect rent, pension, or similar cash flow.
Press Calculate FIRE to display results above the form.
Review the graph, summary cards, and yearly table.
Use the CSV or PDF buttons to save your projection.

Frequently asked questions

1) What does FIRE mean?

FIRE stands for Financial Independence, Retire Early. It focuses on saving and investing enough assets so work becomes optional before a traditional retirement age.

2) Why does the calculator use a withdrawal rate?

The withdrawal rate estimates how much annual spending your portfolio can support. A lower rate requires a larger portfolio and adds a margin of safety.

3) Is a 4% withdrawal rate always safe?

No. It is a planning shortcut, not a promise. Your timeline, taxes, market conditions, and spending flexibility may justify using a lower or higher rate.

4) Why does inflation matter so much?

Inflation raises your future spending needs. Even if expenses feel manageable today, they can require a much larger portfolio decades later.

5) Should I enter gross income or net income?

This version works best with after-tax income because contribution capacity and savings rate become easier to interpret against real spending.

6) What if my contribution changes over time?

Use the contribution growth rate field. It increases yearly savings in the projection and better reflects career growth or future raises.

7) Can this calculator model rental or pension income?

Yes. Enter recurring retirement income in the dedicated field. That reduces the spending your portfolio must cover and lowers the FIRE target.

8) Does reaching FIRE mean I must stop working?

No. It simply means your assets may support your lifestyle. Many people continue working part time, build businesses, or change careers after reaching FIRE.