How to use the fixation index fst calculator
Find how genetically differentiated subpopulations are from expected heterozygosity values. Enter expected heterozygosity of total population, average heterozygosity within subpopulations in the fields above; the fixation index fst, differentiation level are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “Fst”, “population differentiation index”, “fixation index subpopulations”, “calculate fixation index fst”, “find fixation index fst”.
Formula
Variables
- Ht — Expected heterozygosity of total population
- Hs — Average heterozygosity within subpopulations
Worked example
With expected heterozygosity of total population = 0.5, average heterozygosity within subpopulations = 0.4, the calculator gives fixation index fst ≈ 0.2; differentiation level ≈ Moderate differentiation text.
Frequently asked questions
What is the fixation index fst calculator used for?
Find how genetically differentiated subpopulations are from expected heterozygosity values. It helps with questions such as “Fst”, “population differentiation index”, “fixation index subpopulations”.
What is the formula for the fixation index fst calculation?
Fixation index Fst = (Ht-Hs) / Ht. Differentiation level (text) = [Fixation index Fst]>0.25?"Great differentiation":([Fixation index Fst]>0.05?"Moderate differentiation":"Little differentiation"). Here Ht is expected heterozygosity of total population, Hs is average heterozygosity within subpopulations.
What inputs do I need for the fixation index fst calculator?
You need expected heterozygosity of total population, average heterozygosity within subpopulations. 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 the fixation index fst 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 fixation index fst 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.