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Calculadora Capital

FIRE & Financial Independence Calculator

How much do you need invested to live off your returns, and in what year do you get there? Enter your age, what you have already invested, how much you save each month and the expenses you want to cover: the calculator estimates the portfolio you need (the "FI number") and the time to financial independence.

Use a REAL return (already above inflation): for global equities it is around 4% to 5% a year. The 4% rule assumes you can withdraw 4% of the portfolio each year without depleting it.

Portfolio needed (FI number)
€450,000
Time to independence
20 years and 5 months
Age when reached
50 years
Monthly passive income€1,500/mo
Total you save€255,000
From investment growth€197,407

Year-by-year path

YearPortfolio
1€22,790
2€36,235
3€50,368
4€65,224
5€80,840
6€97,254
7€114,509
8€132,646
9€151,712
10€171,752
11€192,818
12€214,962
13€238,239
14€262,707
15€288,426
16€315,461
17€343,880
18€373,752
19€405,153
20€438,160
21€452,407

Educational estimate, not financial advice. Returns are not guaranteed and investments can lose value.

What this calculator does

It works out two things. First, the portfolio you need to live off your returns: annual expenses divided by the safe withdrawal rate (the 4% rule makes this annual expenses times 25). Then it simulates your portfolio growing, month by month, with the savings you make and the return you set, until it reaches that target.

The 4% rule

The 4% rule says that, with a diversified portfolio, you can withdraw about 4% a year (adjusted for inflation) without running out over a 30-year retirement. It is a historical reference, not a guarantee: for more of a buffer, people use 3% to 3.5%, which requires a bigger portfolio.

Use a real return

Enter the return already above inflation (real). For long-run global equities it is around 4% to 5% a year. Because everything is in today’s euros, the portfolio you need and the time to reach it are already in today’s purchasing power, with no separate inflation adjustment.

Worked example

At 30, with €10,000 already invested, €1,000 of monthly savings, a 5% real annual return and €1,500 of monthly expenses, the FI number is €450,000 (€1,500 × 12 ÷ 4%). You reach it in about 20 years and 5 months, at around age 50: you save €255,000 and investment growth provides the other €197,000.

Frequently asked questions

What is the FIRE movement?
FIRE stands for "Financial Independence, Retire Early". The idea is to save and invest a high share of your income to build enough capital to live off your returns, so you no longer depend on a salary.
How much do I need to be independent?
With the 4% rule, you need about 25 times your annual expenses. For €1,500 a month (€18,000 a year), that is €450,000. For more of a buffer, use a withdrawal rate of 3% to 3.5%, which raises the portfolio you need.
Is the 4% rule safe?
It is a reference based on historical US data (the "Trinity study"), not a guarantee. Weak markets early in retirement, taxes and fees can call for a more prudent rate. Use it as a starting point, not a certainty.
Does the calculator take tax off?
No. In Portugal, capital gains on shares and funds are generally taxed at 28%. To project net figures, use a slightly lower return or a slightly larger FI number.

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Author: Thorben Rasmus Idel · Reviewed by: Nahar Geva · Last reviewed: 2026-06-10