Hardy-Weinberg calculatorSequence tools

Hardy-Weinberg equilibrium calculator

An newer, enhanced version of this calculator is available here

Chi-sq Hardy-Weinberg equilibrium test calculator for biallelic markers (SNPs, indels etc).
Enter numbers for each genotype, then click "Calculate". (Copyright OEGE, 2006)

Common homozygotes    Heterozygotes    Rare Homozygotes  

Results area - enter data above and click calculate

(all results rounded to 2 decimal places)

Chi-squared distribution (1 degree of freedom):

P value 0.05 0.01 0.005 0.001
Chi-squared 3.84 6.63 7.88 10.83


  • X2 refers to chi-squared
  • The X2 value indicates the difference between expected and observed values for genotype counts
  • The likelihood of observing these differences by chance can be determined from a X2 table (1 d.f.), a brief example of which is above


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