Ecology & populations · SL/HL
Quadrat Density & Population Estimate Calculator
Enter quadrat counts, quadrat area and total habitat area in matching area units.
Your values
Start with the example or enter your own values. Use a dot for decimals and e for scientific notation.
Calculated locally. No account or input upload.
Result & working
ExampleThe calculator is loading. The worked example is also shown below.
Step-by-step working
The formula
mean count = Σcount/n
density = mean count/quadrat area
estimated population = density × habitat area
| Symbol | Meaning |
|---|---|
| density | Estimated individuals per unit area. |
When to use this calculator
Random or appropriately systematic placement matters; a numerical estimate cannot remove sampling bias.
Worked example
The page opens with these example values. The result below is pre-generated for reference.
- mean count = 60/8 = 7.5
- density = 7.5/0.25 = 30 per m²
- estimate = density × habitat area = 30 × 100 = 3000
Estimated population = 3000
Common mistakes
- Use matching area units for quadrat and habitat.