Hardy Weinberg Equilibrium Calculator

Work out hardy weinberg equilibrium instantly with clear inputs, formula shown and shareable results.

About Hardy Weinberg Equilibrium Calculator

Applies the Hardy-Weinberg expansion to give expected genotype frequencies from one allele frequency.

Formula

Hardy-Weinberg

p^2 + 2pq + q^2 = 1, where p and q are the allele frequencies and the three terms are the genotype frequencies

Worked example

With the default values below, Hardy Weinberg Equilibrium Calculator returns Heterozygote frequency of 42.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Frequency of the dominant alleleaccepts 0.001–0.999: 0.7
Population sizeaccepts 1–10,000,000: 1,000

Results

Heterozygote frequency: 42.000%
Homozygous dominant frequency: 49.000%
Homozygous recessive frequency: 9.000%
Expected heterozygotes in the population: 420.0

Step by step

1Values used
2Hardy-Weinberg
3Heterozygote frequency= 42.000
4Homozygous dominant frequency= 49.000
5Homozygous recessive frequency= 9.000
6Expected heterozygotes in the population= 420.0

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or fees or charges into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What assumptions does it make?

No selection, mutation, migration or drift, random mating and an effectively infinite population.

Why is it still useful?

Departures from expectation reveal exactly which of those assumptions is being violated.