How long until your investment quadruples? This quadrupling time calculator tells you how many periods it takes for a quantity to reach 4× its starting value given a constant growth rate.
Quadrupling Time Calculator
Using the quadrupling time calculator
Enter your expected Rate per period as a percentage. The calculator instantly shows how many periods it takes to quadruple.
The period can be whatever timeframe matches your rate: if you enter an annual return, you get years; monthly return, months.
The quadrupling time formula
The formula for quadrupling time is:
Where r is the rate per period as a decimal (e.g., 7% = 0.07).
Example: quadrupling at 7%
How long to quadruple an investment growing at 7% per year?
The Rule of 144
For quadrupling, you can use the Rule of 144:
At 8%, money quadruples in roughly 144 / 8 = 18 years. At 6%, about 144 / 6 = 24 years.
Why 144? It's exactly twice 72 (the Rule of 72 for doubling). And that makes sense – quadrupling is just doubling twice: 2 × 2 = 4.
Quadrupling = doubling twice
Here's a useful insight: quadrupling time is exactly twice the doubling time at the same rate. Since ln(4) = ln(2²) = 2 × ln(2), the formula gives exactly double the doubling time.
If your investment doubles in 10 years, it quadruples in 20 years. Simple.
