Free · Biology and garden models

Hardy–Weinberg Recessive Frequency & Carriers

Calculate hardy–weinberg recessive frequency & carriers with the retained input modes, unit choices and stated arithmetic assumptions.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

An affected fraction of 1 in 100 is q²=0.01 under the model. Then q=0.1, p=0.9 and the expected heterozygote fraction is 0.18.

q=√affected frequency; p=1−q; genotype fractions p²,2pq,q².

Worked example

Enter these known values and leave the other values blank.

Occurrence of the disease:
100
Healthy allele frequency (p)
0.9
Mutant allele frequency (q)
0.1

Assumptions and limitations

  • This is a two-allele autosomal-recessive Hardy–Weinberg model, assuming random mating, a large population and no relevant migration, selection or mutation effects.
  • Affected frequency is a population fraction under the stated genotype model. The result does not determine an individual person’s genotype, inheritance risk or need for testing.
  • Both allele frequencies lie strictly between zero and one for a finite reciprocal carrier-frequency result. Percentage and one-in-N inputs express the same affected fraction.

Common questions

What does this result represent?

This is a two-allele autosomal-recessive Hardy–Weinberg model, assuming random mating, a large population and no relevant migration, selection or mutation effects.

Can I solve for another quantity?

Enter the known quantities and clear the unknown where an inverse relationship is available. Selection presets remain separate from measurements you supply; use locks to retain known inputs.

References

Bookify enforces finite physical or discrete inputs for this model and detects the stated selected-scenario relationships without changing the captured arithmetic graph.

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