Punnett Square Calculator

How to make a Punnett square

1. Type the genotype of each parent, such as Aa or AaBb. Uppercase letters are dominant.
2. The square shows every combination of gametes.
3. The phenotype ratio appears above the square, and the table lists each genotype with its fraction and percent.

Frequently asked questions

How many genes can I use?

Up to four, which gives a 16 × 16 square for a cross like AaBbCcDd × AaBbCcDd.

Does it assume the genes are unlinked?

Yes. Each gene is assumed to sort independently, with complete dominance.