Coast FIRE Calculator

Coast FIRE is the point where your investments can grow to your retirement goal without any new contributions. This calculator shows how close you are to coasting — and how much freedom that milestone unlocks.

Our free Coast FIRE Calculator helps you estimate costs based on 6 key financial variables. The calculator provides 4 detailed outputs based on current rates and financial benchmarks.

Enter your details to get estimates based on current financial data as of 2026.

What you'll learn:

• Accurate coast fire calculator estimates based on your specific inputs
• Low, average, and high cost ranges for budgeting
• How local factors impact pricing
• Strategies for maximizing your financial outcome

Understanding the cost breakdown helps you budget effectively for your coast fire calculator project. Here are the typical cost components:

Our coast fire calculator uses a multi-variable formula that accounts for the following inputs:

1. Current Age — Range: 18 to 80
2. Target Retirement Age — Range: 50 to 80
3. Current Retirement Savings ($) — Range: 0 to 50,000,000
4. Monthly Contribution ($) — Range: 0 to 50,000
5. Expected Annual Return (%) — Range: 0 to 15
6. Desired Monthly Income ($) — Monthly income needed in retirement

Based on your inputs, the calculator provides:

• Projected Savings at Retirement — Dollar amount based on current market rates
• Savings Needed (4% rule) — Dollar amount based on current market rates
• Projected Gap/Surplus — Dollar amount based on current market rates
• Years of Income Supported

All calculations incorporate location-specific cost adjustments when a ZIP code is provided, using data from industry databases updated for 2026.

Determines the Coast FIRE number — the portfolio value at which you can stop contributing and let compound growth carry you to your full FIRE number by your target retirement age. Formula: Coast FIRE Number = FIRE Number / (1 + Expected Return)^(Years Until Retirement). Once your portfolio reaches this threshold, all new income can go toward current living expenses.

Data Sources:

• Historical S&P 500 returns (10.7% nominal, ~7% real after inflation) for growth projections
• Trinity Study and updated research for FIRE number calculation (25x annual expenses at 4% withdrawal)
• BLS Consumer Expenditure Survey for typical expense benchmarking by age bracket

Key Assumptions:

• Investment returns are compounded annually at the specified average rate; actual returns vary year to year
• The FIRE number is calculated as 25x target annual spending (based on 4% safe withdrawal rate)
• No additional contributions after reaching Coast FIRE; the portfolio grows purely through market returns

Learn more about our data methodology

Several factors influence your coast fire calculator estimate:

Current Age

A key variable in determining your coast fire calculator estimate.

Target Retirement Age

A key variable in determining your coast fire calculator estimate.

Current Retirement Savings ($)

A key variable in determining your coast fire calculator estimate.

Monthly Contribution ($)

A key variable in determining your coast fire calculator estimate.

Expected Annual Return (%)

A key variable in determining your coast fire calculator estimate.

Desired Monthly Income ($)

Monthly income needed in retirement

Market Conditions

Interest rates, inflation, and economic indicators fluctuate over time and directly affect your results. Federal Reserve policy changes can shift rates within weeks.

Time Horizon

Longer time horizons amplify the effect of compound interest and rate changes. Even small rate differences compound into significant dollar amounts over years.

After you run the calculator, your results include interactive sections that help you make informed decisions:

Financial Breakdown

Your results separate principal from interest (or contributions from earnings) so you can see exactly how your money is working. Understanding this split helps you evaluate whether refinancing, extra payments, or alternative strategies could save you money over time.

Visual Chart

Charts make it easy to grasp the relationship between what you pay and what you owe (or what you save and what you earn). A quick look at the visual split helps you decide whether your current approach is on track or whether adjustments to your payment or contribution strategy could improve your outcome.

Save and Share Your Results

Download your complete results as a CSV spreadsheet or PDF report. The PDF includes all your inputs and key results — ready to share with financial advisors or anyone else who needs to review the numbers. No account or signup required.

Here are proven strategies to reduce your costs:

1. Compare Rates from Multiple Lenders: Shop rates from at least 3 lenders. Even a 0.25% difference in interest rate can save thousands over time.
2. Automate Your Savings: Set up automatic transfers to savings or investment accounts. Consistent contributions compound significantly over time.
3. Maximize Tax-Advantaged Accounts: Contribute to 401(k) up to employer match, then fund IRA/Roth IRA. Tax-advantaged growth accelerates your returns.
4. Reduce High-Interest Debt First: Pay off credit cards and high-APR loans before investing. Eliminating 18-25% APR debt is a guaranteed return.
5. Review Fees and Expense Ratios: High fund fees erode returns. Index funds with 0.03-0.10% expense ratios outperform most actively managed funds over time.
6. Use Balance Transfer Offers Strategically: 0% APR balance transfer offers can save hundreds in interest — but pay off before the promotional period ends.