FIRE Calculator

Calculate your Financial Independence, Retire Early number and how long until you reach it

FIRE Number
$1.5M
4% withdrawal rate
Years to FIRE
21 yrs
FIRE age: 51
Monthly Income
$5,000
from portfolio withdrawals
Progress
3.3%
Your Details
30 yrs
yrs
$50K
$60,000
$24,000
8%
%
4%
%
FIRE Summary
FIRE number$1,500,000
Current portfolio$50,000
Gap to FIRE$1,450,000
FIRE age51
Annual retirement income$60,000
Monthly retirement income$5,000
Savings rate (annual)28.6%
Portfolio vs FIRE Number
Portfolio Growth
FIRE Target
FIRE Variants
Lean FIRE
Frugal lifestyle, lower expenses (<$40K/yr). Requires a smaller portfolio but less spending flexibility.
$1.0M
at 33% lower expenses
Regular FIRE
Your current expense level. The standard 4% withdrawal target for financial independence.
$1.5M
your FIRE number
Fat FIRE
Comfortable lifestyle with higher spending (>$100K/yr). More buffer and lifestyle flexibility.
$2.3M
at 50% higher expenses

How the FIRE Calculator works

FIRE — Financial Independence, Retire Early — is reached when your investments can sustainably fund your lifestyle without employment income. This calculator finds your FI number (typically 25× annual spending) and projects how many years your current savings rate takes to reach it.

The engine of FIRE is the savings rate. It works from both ends: saving more accelerates the portfolio, and the lower spending it implies shrinks the target itself. That's why the years-to-FI curve responds so dramatically to savings rate changes.

The formula
FI number = Annual expenses × 25
  • Equivalent to a 4% initial safe withdrawal rate
  • Use 28–33× (3–3.5%) for earlier retirements or more conservative plans

Tips to get the most out of it

  • Know your real annual spending first — the FI number is built on it, and most people guess wrong until they track it.
  • A savings rate of 50% implies roughly 17 years to FI from zero at historical returns; 65% brings it near 10.
  • Plan explicitly for pre-65 healthcare costs — it's the most commonly underestimated line item in early retirement budgets.

Frequently asked questions

How is my FIRE number calculated?

Annual expenses × 25, from the 4% guideline: a diversified portfolio has historically sustained 4% initial withdrawals (inflation-adjusted) for 30+ years. Retiring in your 30s or 40s means a longer horizon, so many early retirees target 3–3.5%, i.e., 28–33× expenses.

Why does savings rate matter more than income?

Because it captures both sides at once. At a 10% savings rate you need ~9 years of expenses saved per decade worked; at 50% you bank a full year of freedom every working year while needing a smaller portfolio. A modest income saved aggressively routinely beats a high income spent.

What are Lean FIRE, Fat FIRE, and Coast FIRE?

Lean FIRE: frugal early retirement on a minimal budget. Fat FIRE: financial independence at a generous spending level, requiring a much larger portfolio. Coast FIRE: having enough invested young that growth alone will fund a normal retirement — you still work, but only to cover current expenses.

Does FIRE mean never working again?

Not necessarily. Many people pursue FI for the freedom and keep working on their own terms — part-time, sabbaticals, passion projects ("Barista FIRE" covers part of expenses with light work). The math in this calculator is about when work becomes optional.

From the Knowledge Base

The FIRE Movement: Financial Independence, Retire Early

What is FIRE, why it's gained massive popularity, and how to calculate your FIRE number to achieve financial independence.

Read the guide

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