Rule of 72 / 114 / 144
Quick mental math: years to double, triple, or quadruple your money.
Rule of 72 / 114 / 144
Time to Double (72/rate)
10.3 years
Amount when Doubled
20,000
Time to Triple (114/rate)
16.3 years
Amount when Tripled
30,000
Time to 4x (144/rate)
20.6 years
Amount when 4x
40,000
Rule of 72: years to double = 72 ÷ rate. 114 for triple, 144 for quadruple. Approximate for 6-10% returns.