Rule of 72: Growth at 6% for 12 Years
At 6% growth per period, a value roughly doubles in 12 periods, illustrating the Rule of 72.
How to use this tool
- Enter initial value, growth rate per period and number of periods in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your final value and the full breakdown beneath it.
The Rule of 72 says 72 ÷ 6% ≈ 12 years to double — verify it here with this calculator.
Frequently asked questions
- What is doubling time?
- The number of periods it takes for the quantity to double. For 10% growth the doubling time is about 7.27 periods (the Rule of 72 estimates ~7.2).
- Can I use years, months or any unit?
- Yes — just be consistent. If rate is per year, time must be in years.