✌️
Rule of 72 Calculator
Estimate how many years it takes to double your money at a given interest rate.
About This Calculator
At 8% annual returns — close to the long-run S&P 500 average — money doubles roughly every 9 years. The Rule of 72 also works in reverse: a 3% inflation rate halves your purchasing power in 24 years. Albert Einstein reportedly called compound interest the most powerful force in the universe.