Allele Frequency Calculator

Adjust the calculator values below

Frequency of the disease in the population

Allele frequency

Healthy allele frequency (p) 0.98
Mutant allele frequency (q) 0.02
Disease frequency 0.0004
Healthy homozygote frequency (p^2) 0.9604
Carrier frequency (2pq) 0.0392
Carrier frequency as 1 in 25.51
0.98
Healthy allele frequency (p) Uses Hardy-Weinberg assumptions from disease occurrence.
Fitness & Health Calculator

Allele Frequency Calculator

Estimate allele frequency from given in:, occurrence of the disease:, and healthy allele frequency (p). Review the formula, key ranges, and practical...

The result is a population-level estimate. It should not be treated as a personal diagnostic result or a substitute for genetic counseling.

What is allele frequency?

Allele frequency describes how common a gene variant is within a population. In this calculator, the focus is a recessive-disease model where the observed disease frequency is used to estimate the mutant allele frequency.

The result is a population-level estimate. It should not be treated as a personal diagnostic result or a substitute for genetic counseling.

How to use the allele frequency calculator?

Choose whether disease occurrence is entered as a proportion or a percentage, then enter the occurrence value. The calculator estimates the healthy allele frequency p, mutant allele frequency q, and carrier frequency 2pq.

The occurrence value should represent the same population you want to analyze. Mixing data from different populations, disease definitions, or screening methods can distort the estimate.

How to calculate allele frequency?

For a recessive disease under Hardy-Weinberg assumptions, disease frequency is q squared. The mutant allele frequency q is the square root of that disease frequency, and the healthy allele frequency p is one minus q.

Carrier frequency is 2pq. The calculator also reports the reciprocal carrier frequency so the result can be read as an approximate one-in-N value.

What is the Hardy-Weinberg equation?

The Hardy-Weinberg equation is p squared plus 2pq plus q squared equals 1. It describes expected genotype frequencies when mating is random and the population is not affected by selection, mutation, migration, or genetic drift.

Real populations may not meet those assumptions exactly. Use the output as a model-based estimate and verify important interpretations with appropriate genetics expertise.

Frequently asked questions

Common questions about allele frequency, input values, result ranges, and when professional guidance matters.

How is allele frequency calculated?

Allele Frequency uses Given in: and Occurrence of the disease: with the relevant health formula or scoring method, then reports healthy allele frequency (p) for interpretation.

Is allele frequency accurate for everyone?

No. Allele Frequency can be useful for screening or planning, but age, sex, body composition, medications, medical history, pregnancy, training status, and measurement quality can affect interpretation.

What does a high allele frequency result mean?

A high result may indicate a higher measurement, score, risk level, or target value depending on the calculator. Read the result with the category labels and clinical context, not as a diagnosis.

What does a low allele frequency result mean?

A low result may be normal, desirable, or a warning sign depending on the metric. Check the calculator's units, reference range, and whether the inputs match the person being assessed.

What inputs matter most for allele frequency?

Given in: and Occurrence of the disease: often drive the result most directly. Use current measurements and the correct units before comparing the result with any reference range.

Can allele frequency replace medical advice?

No. Use it as educational or planning information. Decisions about diagnosis, treatment, medication, pregnancy, or urgent symptoms should be reviewed with a qualified clinician.