The rules of 72, 114, 144 and 70

Divide 72 by your return to estimate years to double, 114 to triple, 144 to quadruple. Divide 70 by inflation to see how fast prices double and your dollar halves.

Fees and inflation show the doubling that actually builds wealth.

The rules versus the exact math

The rule of 70

Inflation compounds against you the same way returns compound for you.