Niche Breadth Calculator
Measure how broadly or narrowly a species uses resources across available categories.
Resource Use Data
Enter comma-separated proportions (will be normalized to sum to 1)
Levins' Index: B = 1 / Σ(pi²)
Ranges from 1 (specialist using one resource) to n (uniform use)
Normalized Proportions:
R1: 30.0%R2: 25.0%R3: 20.0%R4: 15.0%R5: 10.0%
Standardized Niche Breadth (BA)
0.861
Generalist - broad niche
Levins' B
4.444
Effective Resources
4.69
Diversity Indices
Shannon Index (H')1.544
Maximum H' (uniform)1.609
Evenness (J)0.960
Simpson's Index (1-D)0.775
Resource Use Distribution
Resource 130.0%
Resource 225.0%
Resource 320.0%
Resource 415.0%
Resource 510.0%
Additional Metrics
Proportional Similarity0.850
Hurlbert's B0.861
Ecological Interpretation:
Generalist strategy - flexible resource use may provide resilience to environmental change