Biology & Medicine Tool

Allele Frequency

Calculate allele frequencies from AA, Aa and aa genotype counts. This page combines the live calculator with the underlying formula or method, a worked example and practical study notes.

Study Tools / Biology & Medicine / Allele Frequency
Study note: Genetic calculators model the inheritance assumptions stated on the page. They are educational models rather than individualized genetic predictions.
Interactive calculator
Calculate Allele Frequency

What Is the Allele Frequency?

Calculate allele frequencies from AA, Aa and aa genotype counts. The calculator is paired with the governing relationship so the numerical output stays connected to the concept you are studying.

Use Allele Frequency to test worked problems, inspect how changing an input changes the output, and verify your own arithmetic before returning to the underlying concept.

Formula or Method

Formula / method
p = (2AA + Aa) / 2N; q = (2aa + Aa) / 2N

For AA=30, Aa=40 and aa=30, p=(60+40)/200=0.50 and q=0.50. Genotype counts should represent the same population and locus definition. Keep units and conventions consistent with the problem statement and with the options shown in the calculator.

How to Use the Calculator

  1. Read the input labels and enter the values requested by the problem, exercise or sequence.
  2. Check units, signs, angle mode, date convention, population/sample options or other settings before calculating.
  3. Compare the result with the displayed formula or method and the worked example below.
  4. Round only at the stage required by the question, course or reference convention.

Worked Example

Example: For AA=30, Aa=40 and aa=30, p=(60+40)/200=0.50 and q=0.50.

Common Mistakes

Why It Matters for Students

This tool is useful when a biological or physiologic relationship needs a fast numerical or sequence-based check. Keep the variables, units and assumptions visible while practising.

Genotype counts should represent the same population and locus definition. The interactive calculator is designed to make that relationship easier to verify while studying, not to replace the worked reasoning in a textbook or question stem.

Related NexaMed Study Tools

Hardy–Weinberg
Calculate expected genotype frequencies from an allele frequency.
Punnett Square
Calculate basic monohybrid offspring genotype probabilities.
PCR Copy Number
Estimate theoretical PCR copy number from starting template, cycles and efficiency.
Dihybrid Probability
Calculate classic AaBb × AaBb phenotype probabilities under independent assortment.
DNA Molecular Mass
Estimate DNA molecular mass from sequence length.

These pages are part of the same Study Tools system. For the complete collection, open the 2,420-tool NexaMed Study Tools hub.

Frequently Asked Questions

What is the allele frequency used for?
The Allele Frequency applies the relationship or method shown on this page to the inputs you provide. It is intended as a practical study and reference tool and keeps the calculation method visible beside the interactive result.
What formula or method does the allele frequency use?
For AA=30, Aa=40 and aa=30, p=(60+40)/200=0.50 and q=0.50.
How do I use the allele frequency?
Enter the requested values, check units or options, and calculate. Then compare the result with the displayed method, worked example and notes on the page. Use the same conventions required by your course, textbook or problem statement.
Calculation source: This page uses the NexaMed Prep Study Tools engine and the same tool definition used by the main interactive hub. Formula descriptions are presented for educational reference; follow the conventions, units and assumptions required by your course, textbook or examination.