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Punnett square calculator
Cross two parents' genes and see the genotype and phenotype chances.
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About Punnett square calculator
Enter the genotypes of two parents, such as Bb and Bb, and the square lists every possible offspring combination with the chance of each genotype and phenotype. A cross of two heterozygous parents gives the classic 3:1 dominant to recessive ratio. Dihybrid crosses give 9:3:3:1.
How to use Punnett square calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
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Frequently asked questions
What ratio does a Bb x Bb cross give?
Genotypes come out 1 BB : 2 Bb : 1 bb, so the phenotype ratio is 3 dominant to 1 recessive, or 75 percent versus 25 percent.
Is Punnett square calculator free?
Yes. Punnett square calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.