FIRE Gap Calculator
Find out exactly how far you are from financial independence — and which lever closes the gap fastest.
What Is the FIRE Gap?
Your FIRE gap is the difference between where your portfolio will be at your current savings rate and the amount you actually need to retire early. Most people know their FIRE number — but very few know their FIRE gap, or which single change would close it fastest.
The Three Levers That Close the Gap
Every FIRE gap comes down to three variables: how much you spend (which determines your FIRE number), how much you save (which determines how fast your portfolio grows), and what return you earn (which determines compounding power). The calculator above shows you exactly how much each lever moves your timeline — because the answer is different for everyone.
Why Expenses Are the Most Powerful Lever
Reducing expenses does something double: it increases your monthly savings AND lowers your FIRE number simultaneously. Spending $300 less per month does not just add $300 to your portfolio — it also reduces your FIRE target by $90,000 (at the 4% rule). This double effect makes expense reduction the single most powerful lever in the FIRE equation, especially in the early years.
The Cost of Waiting
One year of delay at age 25 can cost you $100,000-$200,000 in final portfolio value due to lost compounding time. The FIRE gap is not just about money — it is about time. Every month you close the gap is a month added back to your free life. Use this calculator regularly to track your progress and identify which changes to make first.