If you've dabbled in investing, you've likely heard of the "Rule of 72." It's a back-of-the-envelope metric for calculating how quickly an investment will double in value. Most financial metrics are ...

What Is the Rule of 72? The Rule of 72 is an easy way to calculate how long an investment will take to double in value given a fixed annual rate of interest. Dividing 72 by the annual rate of return ...

The Rule of 70 is a mathematical formula used to estimate the time it takes for an investment or any quantity to double, given a fixed annual growth rate. This rule is used by investors and financial ...

For the climate-conscious, a marker of 72 may be good enough when you’re setting the thermostat. But when it comes to measuring money, the financially aware use lucky number 72 principally to ...