Population Growth: 100,000 at 5% for 20 Years
A small population of 100,000 at 5% annual growth nearly triples to about 265,330 in 20 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.
Track the rapid expansion of a small population growing at 5% annually over 20 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.