Cramer: The magic of compounding — how to double your money in 7 years (2024)

FAQs

Cramer: The magic of compounding — how to double your money in 7 years? ›

After another year and another 10% gain, it's worth $121. After a third year, it's $133. The gains will continue to grow, because each year money is made from the previous year's profits. With that 10% average annual return, an investor can double his money in about seven years, Cramer said.

How the Rule of 72 Works. For example, the Rule of 72 states that $1 invested at an annual fixed interest rate of 10% would take 7.2 years ((72 ÷ 10) = 7.2) to grow to $2. In reality, a 10% investment will take 7.3 years to double (1.10^7.3 = 2). The Rule of 72 is reasonably accurate for low rates of return.

With an estimated annual return of 7%, you'd divide 72 by 7 to see that your investment will double every 10.29 years. In this equation, “T” is the time for the investment to double, “ln” is the natural log function, and “r” is the compounded interest rate.

All you do is divide 72 by the fixed rate of return to get the number of years it will take for your initial investment to double. You would need to earn 10% per year to double your money in a little over seven years.

Divide 72 by your average expected annual return

If instead your average expected annual return was a more modest 7% (accounting for the typical annual inflation of around 3%), dividing 72 by 7 would result in 10.3, meaning it would take slightly over a decade for your money to double under those conditions.

The rule of 8-4-3 when it comes to compounding indicates a style of investment that accelerates growth with time. Initially, a corpus doubles within 8 years through an average annual return of 12% subsequently another doubling happens for the same period after another 4 years following its initial setting up.

Here, the principal sum doubles itself in 7 years. The rate of interest is 14.28%.

The given problem is a compound interest problem. Therefore, it will take about 9 years for the investment to double.

A 10% interest rate will double your investment in about 7 years (72 ∕ 10 = 7.2); an amount invested at a 12% interest rate will double in about 6 years (72 ∕ 12 = 6). Using the Rule of 72, you can easily determine how long it will take to double your money.

What is the rule of 42? ›

One of the key rules within my unique Income Method is the Rule of 42 - holding at least 42 income-generating investments that enable you to have reduced risk from any individual holding.

According to his math, since 1949 S&P 500 investments have doubled ten times, or an average of about seven years each time.

Do you know the Rule of 72? It's an easy way to calculate just how long it's going to take for your money to double. Just take the number 72 and divide it by the interest rate you hope to earn. That number gives you the approximate number of years it will take for your investment to double.

However, if the stock falls 7% or more below the entry, it triggers the 7% sell rule. It is time to exit the position before it does further damage. That way, investors can still be in the game for future opportunities by preserving capital. The deeper a stock falls, the harder it is to get back to break-even.

The 7-Year Rule for investing is a guideline suggesting that an investment can potentially grow significantly over a period of 7 years. This rule is based on the historical performance of investments and the principle of compound interest.

One of those tools is known as the Rule 72. For example, let's say you have saved $50,000 and your 401(k) holdings historically has a rate of return of 8%. 72 divided by 8 equals 9 years until your investment is estimated to double to $100,000.

The 7 Percent Rule is a foundational guideline for retirees, suggesting that they should only withdraw upto 7% of their initial retirement savings every year to cover living expenses. This strategy is often associated with the “4% Rule,” which suggests a 4% withdrawal rate.