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.
The rule of 72 is only an approximation that is accurate for a range of interest rate (from 6% to 10%). Outside that range the error will vary from 2.4% to 14.0%.
The rule is this: 72 divided by the interest rate number equals the number of years for the investment to double in size. For example, if the interest rate is 12%, you would divide 72 by 12 to get 6. This means that the investment will take about 6 years to double with a 12% fixed annual interest rate.
Final answer:
It will take approximately 15.27 years to increase the $2,200 investment to $10,000 at an annual interest rate of 6.5%.
Try Flipping Things
Another way to double your $2,000 in 24 hours is by flipping items. This method involves buying items at a lower price and selling them for a profit. You can start by looking for items that are in high demand or have a high resale value. One popular option is to start a retail arbitrage business.
The magic of compound interest
Any saver can turn an initial deposit of $5000 into $416,325 (before fees) over 20 years by earning an annual return of 10 per cent and investing an additional $500 each month into their investment kitty.
This rule is based on the principle of compounding interest and suggests that if you invest in a mutual fund with a 12 per cent annual return, your investment will double approximately every 8 years. After the first doubling, it will double again in the next 4 years, and then a final time in the subsequent 3 years.
What is the Rule of 72? Here's how it works: Divide 72 by your expected annual interest rate (as a percentage, not a decimal). The answer is roughly the number of years it will take for your money to double. For example, if your investment earns 4 percent a year, it would take about 72 / 4 = 18 years to double.
Here are the best low-risk investments in 2025:
High-yield savings accounts. Money market funds. Short-term certificates of deposit. Cash management accounts.
To answer the question of how to double my money quickly, simply invest in a portfolio of investment options like ULIPs, mutual funds, stocks, real estate, corporate bonds, Gold ETFs, National Savings Certificate, and tax-free bonds, to name a few.
Before buying an item, figure out how many times you'll use it. If it breaks down to $1 or less per use, I give myself the green light to buy it.
The classic approach to doubling your money is investing in a diversified portfolio of stocks and bonds, which is likely the best option for most investors. Investing to double your money can be done safely over several years, but there's a greater risk of losing most or all your money when you're impatient.
Keep It Simple:- Consider using low-cost index funds or ETFs to build your investment portfolio. These can provide diversification and potentially higher returns over the long term. Understand and Manage Risk:- While aiming for a 20% return, it's important to understand the associated risks.
Trading options is one of the fastest ways to double your money — or lose it all. Options can be lucrative but also quite risky. And to double your money with them, you'll need to take some risk. The biggest upsides (and downsides) in options occur when you buy either call options or put options.
If you start with 1 dollar and double it every day for 30 days, you would have approximately $1,073,741,824. This shows the concept of exponential growth. Like the penny example, this is not typically possible in real-world investing scenarios.
Dividend stocks can be a great choice for investors looking for passive income. View our list of high-dividend stocks, and learn how to invest in them. There are a lot of ways to invest money — high-yield savings accounts, CDs, bonds, funds and stocks are all options.