# Genotype Frequency Calculator Compute genotype frequencies from counts: freq = count / N. Also derives allele and phenotypic frequencies. Derived from Hartl & Clark 2007, Griffiths, StatPearls. Educational use only. > Canonical page: https://elysiatools.com/en/tools/genotype-frequency-calculator - **Category:** Education - **Keywords:** genotype frequency, genotype frequency calculator, genotype count, biallelic, aa frequency, aa frequency, phenotype frequency, population genetics, genetics, biology ## Overview The Genotype Frequency Calculator computes AA, Aa, and aa frequencies from observed genotype counts, then derives allele frequencies p and q and phenotype frequencies under complete dominance. It is intended for educational use. ## Inputs - **AA count (homozygous dominant)** (number): Observed count of genotype AA. - **Aa count (heterozygous)** (number): Observed count of genotype Aa. - **aa count (homozygous recessive)** (number): Observed count of genotype aa. - **Decimal Places** (number) ## When to use - Calculate genotype frequencies from AA, Aa, and aa counts in a population sample. - Derive allele frequencies p and q for a biallelic locus. - Report dominant and recessive phenotype frequencies under complete dominance. ## How it works - Enter the observed counts for AA, Aa, and aa. - The calculator adds the counts to obtain N, then divides each genotype count by N. - It calculates p as freq(AA) + 0.5 × freq(Aa) and q as freq(aa) + 0.5 × freq(Aa). - It reports dominant phenotype frequency as AA + Aa and recessive phenotype frequency as aa, using the selected decimal places. ## Use cases - Population genetics lessons that compare observed genotype proportions. - Biology exercises involving allele-frequency calculations from sample counts. - Classroom demonstrations of dominant and recessive phenotype frequencies. ## Frequently asked questions ### What inputs are required? Enter counts for AA, Aa, and aa. Decimal places are optional and default to 4. ### What does N represent? N is the total sample count: AA count + Aa count + aa count. ### How are genotype frequencies calculated? Each genotype frequency equals its observed count divided by N. ### What do p and q represent? p and q are the calculated frequencies of the two alleles at the biallelic locus. ### Can this calculator be used for medical diagnosis? No. It is provided for educational use only. ## Related tools - [Allele Frequency Calculator (p = (2AA + Aa) / 2N)](https://elysiatools.com/en/tools/allele-frequency-calculator): Compute allele frequencies from genotype counts: p = (2AA + Aa) / 2N, q = (2aa + Aa) / 2N. Derived from Hartl & Clark 2007, Griffiths, StatPearls. Educational use only. - [Hardy-Weinberg Equilibrium Calculator (p² + 2pq + q² = 1)](https://elysiatools.com/en/tools/hardy-weinberg-equilibrium): Compute allele and expected genotype frequencies under Hardy-Weinberg equilibrium. 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