# FIRE Number Calculator

Calculate your FIRE number for financial independence and early retirement. See how long until you can retire based on savings rate and investments.

## What this calculates

Calculate your Financial Independence, Retire Early (FIRE) number and how many years it will take to get there. Enter your expenses, savings, and investment return to find your path to financial freedom.

## Inputs

- **Annual Living Expenses** ($) — min 0 — Your total annual expenses in retirement.
- **Safe Withdrawal Rate** (%) — min 1, max 10 — Annual withdrawal rate (4% is the standard FIRE rule).
- **Current Savings/Investments** ($) — min 0 — Total current investment portfolio value.
- **Annual Savings** ($) — min 0 — How much you save and invest per year.
- **Expected Annual Return** (%) — min 0, max 15 — Expected average annual investment return.

## Outputs

- **Your FIRE Number** — formatted as currency — The portfolio size needed for financial independence.
- **Years to FIRE** — Estimated years until you reach your FIRE number.
- **Savings Rate** — formatted as percentage — Percentage of income you are saving.
- **Progress to FIRE** — formatted as percentage — How far along you are to your FIRE number.
- **Monthly Passive Income at FIRE** — formatted as currency — Monthly income from your portfolio at FIRE.

## Details

The FIRE movement (Financial Independence, Retire Early) is built around the concept that by saving aggressively and investing wisely, you can accumulate enough wealth to live off investment returns indefinitely. Your FIRE number is the portfolio size that generates enough passive income to cover your annual expenses.

The standard formula is: FIRE Number = Annual Expenses / Withdrawal Rate. At the commonly used 4% withdrawal rate, you need 25 times your annual expenses. If you spend $50,000/year, your FIRE number is $1,250,000.

The savings rate is the single most important factor in how quickly you reach FIRE. Someone saving 20% of income might take 37 years, while someone saving 50% could reach FIRE in about 17 years. Saving 70% reduces the timeline to roughly 8 years. This is because a high savings rate both increases the amount invested and demonstrates that you can live on less, reducing your FIRE number.

## Frequently Asked Questions

**Q: What is the FIRE movement?**

A: FIRE stands for Financial Independence, Retire Early. It is a movement focused on aggressive saving and investing to build a portfolio large enough to live off investment returns, allowing you to retire decades before the traditional retirement age. FIRE followers typically aim to save 50-70% of their income and invest in low-cost index funds. Variations include Lean FIRE (minimal expenses), Fat FIRE (comfortable lifestyle), and Barista FIRE (part-time work supplements investments).

**Q: Why is the 4% rule used for FIRE?**

A: The 4% rule comes from the 1998 Trinity Study, which found that withdrawing 4% of a diversified portfolio annually (adjusted for inflation) had a very high probability of lasting at least 30 years. For FIRE, some practitioners use a more conservative 3-3.5% rate since early retirees may need their portfolio to last 40-60 years. The rule assumes a roughly 50/50 to 75/25 stock/bond portfolio. Historically, the 4% rule would have survived even the worst 30-year periods in market history.

**Q: How does savings rate affect time to FIRE?**

A: Savings rate is the most powerful lever for reaching FIRE. At a 10% savings rate, FIRE takes about 51 years. At 25%, about 32 years. At 50%, about 17 years. At 75%, about 7 years. This relationship is not linear because a higher savings rate both increases investment contributions and decreases the amount you need to replace in retirement. Someone saving 50% only needs to replace 50% of their income, while someone saving 10% needs to replace 90%.

**Q: What are the different types of FIRE?**

A: Lean FIRE involves retiring with minimal expenses, typically $25,000-$40,000/year. Regular FIRE targets middle-class expenses of $40,000-$80,000/year. Fat FIRE aims for a comfortable or luxury lifestyle of $80,000-$200,000+/year. Barista FIRE means semi-retirement with part-time work supplementing investment income. Coast FIRE means saving enough that compound growth alone will reach your retirement goal by traditional retirement age, allowing you to stop saving and only earn enough to cover current expenses.

**Q: What about healthcare costs before Medicare age?**

A: Healthcare is one of the biggest challenges for early retirees in the US, as Medicare eligibility starts at 65. Options include ACA marketplace plans (subsidies available based on MAGI), health sharing ministries, spouse's employer plan, COBRA (short-term), or part-time work that includes health benefits (Barista FIRE). Budget $500-$1,500/month per person for healthcare premiums and out-of-pocket costs when calculating your FIRE number. This is often the largest variable expense for early retirees.

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Source: https://vastcalc.com/calculators/finance/fire-number
Category: Finance
Last updated: 2026-04-21