The most basic example of the Rule of 72 is one we can do without a calculator: Given a 10% annual rate of return, how long will it take for your money to double? Take 72 and divide it by 10 and you get 7.2. This means, at a 10% fixed annual rate of return, your money doubles every 7 years.

At 10%, you could double your initial investment every seven years (72 divided by 10). In a less-risky investment such as bonds, which have averaged a return of about 5% to 6% over the same time period, you could expect to double your money in about 12 years (72 divided by 6).

How many years does it take to double your retirement?

The Rule of 72 suggests that only takes 3.6 years. Please remember that this is an estimation tool. Markets at any point can vary dramatically from historical averages. Strong markets could shorten the time for your money to double, and down markets can push out this timing.

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.

One of the most common percentage-based budgets is the 50/30/20 rule. The idea is to divide your income into three categories, spending 50% on needs, 30% on wants, and 20% on savings. Learn more about the 50/30/20 budget rule and if it's right for you.

Legendary investor Warren Buffett invented the “90/10" investing strategy for the investment of retirement savings. The method involves deploying 90% of one's investment capital into stock-based index funds while allocating the remaining 10% of money toward lower-risk investments.

Once you have an estimate of your annual retirement spending, you can begin to work out how much you need overall by multiplying your annual spending by the number of years you expect to spend in retirement, figuring in an extra 3% per year for inflation.

The rule of 55 is an IRS provision that allows workers who leave their job for any reason to start taking penalty-free distributions from their current employer's retirement plan once they've reached age 55.

By age 40, you should have three times your annual salary already saved. By age 50, you should have six times your salary in an account. By age 60, you should have eight times your salary working for you. By age 67, your total savings total goal is 10 times the amount of your current annual salary.

At age 60, a person can retire on 2 million dollars generating $122,000 a year for the rest of their life starting immediately. At age 65, a person can retire on 2 million dollars generating $134,600 a year for the rest of their life starting immediately.

The average 401(k) balance across all savers who've invested continuously for five years is $267,000. The average 401(k) balance specifically for Gen Z savers who've invested continuously for five years is $23,900.

So, to answer the question, we believe having one to one-and-a-half times your income saved for retirement by age 35 is a reasonable target. It's an attainable goal for someone who starts saving at age 25. For example, a 35-year-old earning $60,000 would be on track if she's saved about $60,000 to $90,000.

A good retirement income is about 80% of your pre-retirement income before leaving the workforce. For example, if your pre-retirement income is $5,000 you should aim to have a $4,000 retirement income.

Although healthcare costs take up an increasingly large chunk of overall expenses in retirement, for most retirees the biggest expense is the same one they faced throughout much of their adult lives: housing. Overall housing costs don't just include monthly mortgage or rent payments.

What Is a Good Retirement Income? According to AARP, a good retirement income is about 80 percent of your pre-tax income prior to leaving the workforce. This is because when you're no longer working, you won't be paying income tax or other job-related expenses.

Retirement planners typically tell Americans to invest 60% of their retirement funds in stocks and 40% in bonds. But that time-tested strategy fell apart this year as poor performance in many financial markets wiped out many workers' savings.

How much retirement should I have at 60? A general rule for retirement savings by age 60 is to aim to have about seven to eight times your current salary saved up. This means someone earning $75,000 a year would ideally have between $525,000 to $600,000 in retirement savings at that age.

The 25x Rule is simply an estimate of how much you'll need to have saved for retirement. You take the amount you want to spend each year in retirement and multiply it by 25. Generally, you can look at your current salary to get an idea of how much you might be able to comfortably live off in retirement.

One suggestion is to have saved five or six times your annual salary by age 50 in order to retire in your mid-60s. For example, if you make $60,000 a year, that would mean having $300,000 to $360,000 in your retirement account. It's important to understand that this is a broad, ballpark, recommended figure.

You may be starting to think about your retirement goals more seriously. By age 40, you should have saved a little over $175,000 if you're earning an average salary and follow the general guideline that you should have saved about three times your salary by that time.

If you're a single adult, depending on your age and sex (the USDA estimates are higher for men and lower for both women and men 71 and older), look to spend between $229 and $419 each month on groceries. For a two-adult household, the figure above will double: $458 to $838.