FIRE Calculator

Plan your path to Financial Independence and Early Retirement. Calculate your FIRE number and see when you might be able to retire.

Your Details

Standard assumption is 4%

Target FIRE Number

$1,000,000
Time to FI (Base Case)
30 Years
Target Year
2056

Sensitivity Scenarios

Conservative (-2% Return)
39 Yrs
Base Case
30 Yrs
Aggressive (+2% Return)
25 Yrs

Disclaimer: The results provided by this calculator are estimates and projections, not predictions or financial advice. Actual market returns, inflation, and personal circumstances will vary over time. Please consult a qualified financial advisor before making important financial decisions.

Author / Editor:PenGenie Editorial Team
Review note:Check current official rules before acting
Calculation details

Private Browser-Based Financial Planning

Fast calculator execution with private inputs, clear estimates, and responsive layouts across desktop and mobile.

Browser-based processing

In-Browser Processing

Salary, tax, savings, and career planning values are processed locally wherever possible. No account or saved calculation history is required.

Immediate recalculation

Fast local recalculation

Update inputs and see planning results immediately, without waiting for signups, dashboards, or checkout flows.

Cross-Engine Support

Browser Compatibility

Works across modern desktop and mobile browsers so salary, tax, and savings calculations remain usable on any screen size.

What is a FIRE Calculator?

This tool projects when you may be able to stop working based on Financial Independence, Retire Early (FIRE) math. It applies your annual expenses, safe withdrawal rate, savings, and growth assumptions to estimate when your portfolio could support your lifestyle.

Who Should Use This Tool?

Anyone aiming to retire before the traditional age of 65 can use it to compare scenarios. Whether you are pursuing Lean FIRE, Coast FIRE, or Fat FIRE, treat the result as a planning estimate and revisit it as your spending, savings, and returns change. Use our savings rate calculator to refine your inputs.

Examples

Standard Coast FIRE

Example Input

Current portfolio: $200k. Annual spending: $40k. Target Safe Withdrawal Rate: 4%. Expected return: 7%.

Sample Output

Your target FIRE number is $1,000,000. By investing $2,000 a month, you will hit this target in roughly 15 years.

Fat FIRE Trajectory

Example Input

Current portfolio: $500k. Desired annual retirement spending: $120k. Target SWR: 3.5%.

Sample Output

Your Fat FIRE number is roughly $3,428,000. With a $5,000 monthly contribution, it will take approximately 18 years to reach your goal.

Actionable Use Cases

Model out different scenarios to see the impact of cutting expenses versus increasing income. Lowering your retirement living expenses by just $5,000 a year can shave years off your working life. See our compound interest calculator to visualize the heavy lifting your portfolio does in the final years.

How to Optimize Your Output

Be brutally honest about your future expenses. Will you have a paid-off house? Will you need to pay for private healthcare? Read our comprehensive FIRE guide to understand how to stress-test your safe withdrawal rate against historical market downturns.

Common Pitfalls

The biggest mistake is assuming a constant 10% market return with no inflation. Always use real (inflation-adjusted) returns, typically around 5% to 7%. Another pitfall is forgetting to plan for taxes in retirement; use our capital gains tax calculator to estimate your future tax drag.

FAQ

What is the 4% rule?

The 4% rule is a rule of thumb based on the Trinity Study that suggests you can safely withdraw 4% of your initial retirement portfolio balance each year, adjusted for inflation, for 30 years without running out of money.

How do I calculate my FIRE number?

The simplest method is to multiply your expected annual expenses in retirement by 25. For example, if you need $40,000 a year, your FIRE number is $1,000,000.

What is the difference between Lean FIRE and Fat FIRE?

Lean FIRE involves extreme frugality and retiring with a minimal budget (e.g., $30k/year). Fat FIRE is for those who want a luxurious early retirement and build a much larger portfolio to support high spending.

Why Use Our Tool?

Calculations run locally in your browser (compatible with modern versions of Chrome, Safari, Edge, Firefox). The tool does not connect to bank or investment accounts; review the Privacy Policy because standard site services may still make network requests.

Workflow Sequence

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