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In finance, the rule of 72, the rule of 70 [1] ... is the number of periods required. The formula above can be used for more than calculating the doubling time. If ...
The formula for the Rule of 72. The Rule of 72 can be expressed simply as: Years to double = 72 / rate of return on investment (or interest rate)
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:
The Summa de arithmetica of Luca Pacioli (1494) gives the Rule of 72, stating that to find the number of years for an investment at compound interest to double, one should divide the interest rate into 72. Richard Witt's book Arithmeticall Questions, published in 1613, was a landmark in the history of compound interest.
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The formula contained in this law, which determined the amount due to lenders, was called the "rule of 78" method. The reasoning behind this rule was as follows: A loan of $3000 can be broken into three $1000 payments, and a total interest of $60 into six. During the first month of the loan, the borrower has use of all three $1000 (3/3) amounts.
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