FST Calculator

Calculate FST (fixation index) to measure genetic differentiation between populations.

Input Data

Population 1 Frequency

Population 2 Frequency

Include third population

FST = (Ht - Hs) / Ht

0.0909

9.09% differentiation

Moderate - Moderate differentiation

Ht (Total)0.4950

Hs (Subpopulations)0.4500

Mean Frequency (p-bar)0.4500

Nm (Migrants per Gen)2.5000

GST (Nei's)0.0909

D (Jost's)0.1636

0 - 0.05Little differentiation

0.05 - 0.15Moderate

0.15 - 0.25Great

>0.25Very great