Rule 70 Time to Double Calculator
This calculator uses Rule 70 to estimate how long it will take to double an investment at a given interest rate. Input the annual interest rate, and this tool will calculate the approximate number of years required to double your investment.
Calculate the Time to Double Your Investment Using Rule 70
Rule 70 Formula for Time to Double
$$text{Time to Double} = frac{70}{r}$$
Where:
- r – Annual interest rate (as a percentage)
The Rule of 70 is an approximation that helps estimate the number of years it takes for an investment to double, based on its annual rate of return. This rule assumes compounding annually and is useful for quick estimates in personal finance, investing, and economic analysis. Unlike the Rule of 72, which is better for periodic compounding, the Rule of 70 is suited for simpler interest compounding scenarios.