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Rule of 72 Chart

The rule of 72 is one of the methods for estimating the doubling period of an investment. It states that the rule number (72) is divided by the interest percentage to obtain the periods (years) required for doubling. The below given Rule of 72 chart shows you the number of years required to double the investment at a interest rate, as per the Rule of 72, Rule of 70, Rule of 69.3 and the 72 adjusted rule and the E-M rule. Refer this Rule of 72 table and plan to double your investment.

Rule of 72 Table

Rate(%) Actual Years Rule of 72 Rule of 70 Rule of 69.3 72 adjusted E-M rule
0.25 277.605 288.000 280.000 277.200 277.667 277.547
0.5 138.976 144.000 140.000 138.600 139.000 138.947
1 69.661 72.000 70.000 69.300 69.667 69.648
2 35.003 36.000 35.000 34.650 35.000 35.000
3 23.450 24.000 23.333 23.100 23.444 23.452
4 17.673 18.000 17.500 17.325 17.667 17.679
5 14.207 14.400 14.000 13.860 14.200 14.215
6 11.896 12.000 11.667 11.550 11.889 11.907
7 10.245 10.286 10.000 9.900 10.238 10.259
8 9.006 9.000 8.750 8.663 9.000 9.023
9 8.043 8.000 7.778 7.700 8.037 8.062
10 7.273 7.200 7.000 6.930 7.267 7.295
11 6.642 6.545 6.364 6.300 6.636 6.667
12 6.116 6.000 5.833 5.775 6.111 6.144
15 4.959 4.800 4.667 4.620 4.956 4.995
18 4.188 4.000 3.889 3.850 4.185 4.231
20 3.802 3.600 3.500 3.465 3.800 3.850
25 3.106 2.880 2.800 2.772 3.107 3.168
30 2.642 2.400 2.333 2.310 2.644 2.718
40 2.060 1.800 1.750 1.733 2.067 2.166
50 1.710 1.440 1.400 1.386 1.720 1.848
60 1.475 1.200 1.167 1.155 1.489 1.650
70 1.306 1.029 1.000 0.990 1.324 1.523

Rule of 72 is one of the three methods of estimating investment doubling period, the others being the rule of 70 and the rule of 69.3. It works well in common interest situations, whereas 69 is more accurate for continuous compounding. Feel free to refer the above Rule of 72 chart to know the doubling time of your investment.