en.wikipedia.org/wiki/Rule_of_72

In finance, the **rule of 72**, the rule of 70 and the rule of 69.3 are methods for
estimating an investment's doubling time. The rule number (e.g., 72) is divided by
the ...

www.investopedia.com/terms/r/ruleof72.asp

The **rule of 72** is a shortcut to estimate the number of years required to double
your money at a given annual rate of return. The rule states that you divide the
rate ...

www.investopedia.com/ask/answers/04/040104.asp

Apr 4, 2017 **...** The '**Rule of 72**' is a simplified way to determine how long an investment will take
to double, given a fixed annual rate of interest. By dividing 72 ...

www.moneychimp.com/features/rule72.htm

The **rule** says that to find the number of years required to double your money at a
given interest rate, you just divide the interest rate into **72**. For example, if you ...

www.khanacademy.org/economics-finance-domain/core-finance/interest-tutorial/compound-interest-tutorial/v/the-rule-of-72-for-compound-interest

Using the **Rule of 72** to approximate how long it will take for an investment to
double at a given interest rate.

www.primerica.com/public/rule-of-72.html

The **Rule of 72** is an easy way to calculate just how long it's going to take for your
money to double.

betterexplained.com/articles/the-rule-of-72

The **Rule of 72** is a great mental math shortcut to estimate the effect of any growth
rate, from quick financial calculations to population estimates. Here's the ...

financeformulas.net/Rule_of_72.html

The **Rule of 72** is a simple formula used to estimate the length of time required to
double an investment. The **rule of 72** is primarily used in off the cuff situations ...

www.investinganswers.com/financial-dictionary/technical-analysis/rule-72-1615

For example, using the **rule of 72**, an investor who invests $1,000 at an interest
rate of 4% per year, will double their money in approximately 18 years.