Blood-type predictor

ABO chances from two parent types — classroom genetics.

What it does

The Blood-type predictor works out which ABO blood types a baby could have, and their approximate chances, from two parent types using a classroom Mendelian table. The Rh factor (+/−) is ignored, as the tool notes, and the label is clear: entertainment only — not a paternity test and not medical advice. Copy options cover the possible types, the chances, and the parent types; print and share included.

Who it’s for

The science-curious, and parents who know their own types and enjoy a probability table.

How to use it, step by step

Select Parent 1's blood type.
Select Parent 2's blood type.
Tap Estimate for possible types and approximate chances.
Copy the types, chances, or parents — or print the result.

What you get

Possible baby ABO types with approximate chances from the parent combination.

✦ A worked example

You give it

Parent 1: A. Parent 2: B.

You get

The famous classroom result: all four ABO types are possible — the chart that made a generation of students sit up in biology class.

💡 Tips & tricks

O + O is the only combination with a single outcome; every other pairing is a spread worth peeking at.
Actual blood type is confirmed by testing after birth — this sketch is for the fun of the odds.

Enough reading — the tool itself is one tap away, and it is free.

Try the Blood-type predictor →

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