Population Growth: 2 Million at 2.5% for 25 Years
At 2.5% annual growth, a population of 2 million nearly doubles to about 3.72 million in 25 years.
How to use this tool
- Enter initial population, annual growth rate and years in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your final population and the full breakdown beneath it.
Project a regional population of 2 million growing at 2.5% per year — close to the global average — over 25 years.
Frequently asked questions
- What is the difference between continuous and annual compounding?
- Continuous uses e^(rt); annual uses (1+r)^t. For small r they are close, but continuous growth is slightly faster and is the standard in population biology.
- Can growth rates be negative?
- Yes — a negative rate models population decline or any shrinking quantity.