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Blood type calculator
What blood types a child can have from the parents' blood types and Rh factor.
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About Blood type calculator
Pick both parents' ABO groups and Rh factor to see which blood types a child can have and how likely each one is. A and B alleles are dominant over O, so two type A parents can still have a type O child if both carry a hidden O allele.
How to use Blood type 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.
Also known as
Frequently asked questions
Can two O parents have a child with type A?
No. Type O is recessive and both parents carry only O alleles, so every child is type O. A child with another type would suggest a rare genetic exception or a lab error.
Is Blood type calculator free?
Yes. Blood type 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.