How to Calculate Doubling Time
What is Doubling Time?
A doubling time calculator uses the Rule of 72 (or exact calculation) to determine how long it takes for a quantity to double at a constant growth rate. At 6% annual growth, 72 ÷ 6 = 12 years to double. Applies to investments, population growth, bacterial growth, and any exponential process.
Step-by-Step Guide
- 1Apply Rule of 70 or exact formula
- 2Divide by growth rate
- 3Calculate time to double
Worked Examples
Input
5% annual growth
Result
~14 years to double
Rule of 70: 70/5 = 14
Common Mistakes to Avoid
- ✕Not double-checking results
- ✕Ignoring edge cases
Frequently Asked Questions
What does this calculator do?
Input values
How do I use this calculator?
System calculates
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