What is the formula for doubling investment value ?

Can someone show me using simple math (basic math)
How long it would take to double at various interest rates.
Without regard for Administrative fees.

Rule of 72 is a great approximation when determining amount of time for compound interest to double the initial investment.

Example: you deposit set sum at 6% interest. Forget about the decimal points and divide 72 by 6. So it will take 12 years.

You could always use the rule of 72 you take 72 and divide it by the interest rate so if you get 2% interest it would take 36 years to double.

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