Allele Carrier Frequency Calculator
Estimate heterozygous carrier frequency under Hardy-Weinberg equilibrium.
Allele Carrier Frequency measurements
Enter your values, then calculate.
Result
How to calculate allele carrier frequency
This calculator applies the Hardy-Weinberg principle to estimate the frequency of heterozygous carriers in a population, based on the frequency of a recessive allele.
How the calculation works
Carrier frequency = 2 × (1 − q) × q, where q is the recessive allele frequency (a value between 0 and 1). This comes from the Hardy-Weinberg equation 2pq, where p = 1−q is the dominant allele frequency.
Example
A recessive allele frequency (q) of 0.2: Carrier frequency = 2 × (1−0.2) × 0.2 = 2 × 0.8 × 0.2 = 0.32, meaning roughly 32% of the population is expected to be a carrier.
Frequently asked questions
What does Hardy-Weinberg equilibrium assume?
It assumes a large population with random mating, no significant mutation, no migration in or out, and no natural selection acting on the gene in question. Real populations often deviate from these assumptions to some degree.
Allele Carrier Frequency Calculator
Carrier frequency = 2 × (1 − q) × q, where q is the recessive allele frequency (a value between 0 and 1). This comes from the Hardy-Weinberg equation 2pq, where p = 1−q is the dominant allele frequency.
Let's understand your allele carrier frequency result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Allele Carrier Frequency
- Enter q as a decimal proportion between 0 and 1 (e.g., 0.2 for 20%), not as a percentage or raw count.
- This calculation assumes Hardy-Weinberg equilibrium — a population not undergoing significant selection, mutation, migration, or non-random mating for that gene.
Common Allele Carrier Frequency Mistakes to Avoid
- Entering q as a whole percentage (like 20) instead of a decimal proportion (0.2), which produces a nonsensical result outside the valid 0-1 range.
When to Use This Calculator
This calculator applies the Hardy-Weinberg principle to estimate the frequency of heterozygous carriers in a population, based on the frequency of a recessive allele.