Divide 72 by an assumed annual percentage return to estimate doubling time. It is a planning shortcut, not a forecast.
OUR METHODSources → assumptions → European context → verdict
Simple examples
At 8%, 72 ÷ 8 suggests roughly nine years. At 4%, it suggests about eighteen years. At 0.5%, the estimate is about 144 years.
Use real assumptions
Inflation, fees and tax reduce purchasing-power growth. Use a net return when comparing long-term outcomes.
Know the limit
Markets do not deliver a fixed return every year. The rule illustrates the power of rate and time; it does not promise a date.
Educational illustration only—not personal financial, tax or investment advice. Tax, salary, broker and market figures change; verify current local information before acting.