Population Decrease Calculator

Calculate how a population decreases over time using initial population, annual decrease rate, and time period

Input Parameters

Calculation Results

Calculation Formula

Final Population = Initial Population × (1 - Rate/100)^Time Period

Where:
Initial Population: The starting population size
Rate: Annual population decrease percentage
Time Period: Number of years
Final Population: Projected population after the specified time period

Population Decrease Calculator Usage Guide

Learn how to use the Population Decrease Calculator and understand its working principles

How to Use This Calculator

  1. Enter the Initial Population - the starting population size.
  2. Enter the Annual Decrease Rate as a percentage (e.g., 1.5 for 1.5%).
  3. Enter the Time Period in years.
  4. Click the Calculate button to see the results.
  5. Use the Reset button to clear all inputs and start over.

Understanding Population Decrease

This calculator uses the formula:

Final Population = Initial Population × (1 - Rate/100)^Time Period

This exponential decay formula calculates how a population decreases over time when experiencing a constant annual decrease rate.

Example

If a city has an initial population of 50,000 people with an annual decrease rate of 2%, you can calculate the population after 10 years:

  • Initial Population: 50,000
  • Decrease Rate: 2%
  • Time Period: 10 years
  • Final Population: 50,000 × (1 - 2/100)^10 = 50,000 × 0.98^10 ≈ 37,688

Important Notes

This calculator assumes a constant decrease rate throughout the time period. In reality, population changes can be affected by many factors including birth rates, death rates, migration, and changes in decrease rate over time.