The Rule of 72 is a shortcut or rule of thumb used to estimate the number of years required to double your money at a given annual rate of return and vice versa.

If you're picturing a stress-free retirement where you live off investment interest, use this easy formula to calculate how much of a principal you'll need.

Master calculating cost of equity in Excel using CAPM. Discover step-by-step guidance on market return, risk-free rate, and ...