How to use the species–area relationship calculator
Predict species richness from habitat area. Enter constant c, exponent z, area in the fields above; the expected species, species remaining after losing 50% area, species lost are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- c — Constant c
- z — Exponent z
- A — Area (km²)
Worked example
With constant c = 10, exponent z = 0.25, area = 100 km², the calculator gives expected species ≈ 31.62278; species remaining after losing 50% area ≈ 26.59148; species lost ≈ 5.031297.
Frequently asked questions
What is the formula for the species–area relationship calculation?
Expected species = c × A^z. Species remaining after losing 50% area = c × (A / 2)^z. Species lost = [Expected species]-[Species remaining after losing 50% area]. Here c is constant c, z is exponent z, A is area (km²).
What inputs do I need for the species–area relationship calculator?
You need constant c, exponent z, area in km². Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.