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In finance, the rule of 72, the rule of 70 [1] 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 interest percentage per period (usually years) to obtain the approximate number of periods required for doubling.
To calculate based on a lower interest rate, like 2 percent, drop the 72 to 71. To calculate based on a higher interest rate, add one to 72 for every 3 percentage point increase.
Using the Rule of 72, your money should double every 10.3 years. So, by age 45, you should have around $200,000 in retirement savings. By age 55, you should have around $400,000.
This "Rule of 70" gives accurate doubling times to within 10% for growth rates less than 25% and within 20% for rates less than 60%. Larger growth rates result in the rule underestimating the doubling time by a larger margin. Some doubling times calculated with this formula are shown in this table. Simple doubling time formula:
Here's the formula to calculate your Estimated Due Date using Naegele's rule : Date of Last Menstrual Period + 7 Days + 9 Calendar Months = Date of Estimated Date of Delivery. Example one: LMP = 18 March 2000 +7 days (1 week) = 25 March 2000 +9 months = 25 December 2000. Example two: LMP = 8 May 2020 +1 year = 8 May 2021 −3 months = 8 ...
Account type. Estimated transfer time. When court oversight is required. Individual • 3 to 6 weeks with a beneficiary • 3 to 24 months without a beneficiary