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Allele Frequency Calculator

Biology
0.0(0)

Estimates the frequency of a gene variant in a population using the Hardy-Weinberg equation.

More tools:Science & Lab Calculators
How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Frequency of Allele A (p) in the units shown.

Step 2

Read Genotype Frequency of AA (p^2), Frequency of Allele a (q), Genotype Frequency of Aa (2pq), and Genotype Frequency of aa (q^2) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Balanced Alleles

Frequency of Allele A (p): 0.5

Genotype Frequency of AA (p^2): 0.25; Frequency of Allele a (q): 0.5; Genotype Frequency of Aa (2pq): 0.5; Genotype Frequency of aa (q^2): 0.25

Dominant Allele Prevalent

Frequency of Allele A (p): 0.7

Genotype Frequency of AA (p^2): 0.49; Frequency of Allele a (q): 0.3; Genotype Frequency of Aa (2pq): 0.42; Genotype Frequency of aa (q^2): 0.09

Recessive Allele Prevalent

Frequency of Allele A (p): 0.3

Genotype Frequency of AA (p^2): 0.09; Frequency of Allele a (q): 0.7; Genotype Frequency of Aa (2pq): 0.42; Genotype Frequency of aa (q^2): 0.49

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