Rule of 70

In addition to the Rule of 72, you can also use the Rule of 70 to calculate the time it takes to double an investment. Apart from the obvious difference between the Rule of 72 and the Rule of 70 is that the annual yield is exchanged for constant annual growth rate.

The formula is based on dividing the number 70 of the constant annual growth rate. For example, a quantity growing consistently at 5% per year, according to the rule of 70, will take 14 years (70 ÷ 5 = 14) to double the quantity.

It is important to note that the Rule of 70 is an approximate calculation and not an exact forecast. Keep in mind that several other factors, such as taxes and inflation, can also affect investments.