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Blood type calculator

There are eight main blood types: A, B, AB and O, each either Rh positive or Rh negative. Choose yours and it shows which patients can be given your red cells, and which red cells you can receive.

Vérátömlesztést csak egészségügyi személyzet végez, vércsoport-meghatározás és keresztpróba után.

Terepen vért adni vagy kapni nem szabad. Ezt nem lehet rögtönözni.

A kalkulátor tájékoztató: arra való, hogy értsd a szabályt, nem arra, hogy terepen dönts belőle.

Források: Magyar Vöröskereszt, Ausztrál Vöröskereszt (Lifeblood), Amerikai Vöröskereszt.

Blood transfusions are given only by medical staff, after laboratory blood typing and cross-matching. Never give or receive blood in the field: this cannot be improvised. If someone is bleeding heavily, press directly on the wound and call 112.

Sources: Hungarian Red Cross, Australian Red Cross Lifeblood, American Red Cross. Sources as of 25 October 2026.

What it is good for, and what it is not

This calculator comes from the PrepperPapa app, where it is free too. The calculation runs in your browser: we send nothing anywhere and store no data about it.

PrepperPapa app

The same in your pocket, without internet

These calculators are in the app too, free, and they work without a network as well. Alongside them: stock, emergency card, compass and knowledge base.

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