Blood Type Calculator

Written by Great Medico

Updated September 24, 2026 •2 min read

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CBC and coagulation data often become more useful after one focused calculation. Blood Type Calculator applies the specific hematology formula or score built into this tool and keeps its assumptions visible.

What this calculator does

Blood Type Calculator uses Mother blood type and Father blood type to calculate possible child ABO/Rh groups. Where supported, it also shows Possible Rh so the primary result is easier to check. It follows the exact field flow and engine behavior in this plugin rather than describing a different calculator with the same name. Hematology formulas can organize CBC, coagulation, transfusion, or prognostic data, but a score or derived index does not replace the smear, assay method, disease context, or treatment protocol.

How to use it

Enter or select Mother blood type and Father blood type. Use the units offered by the calculator and keep paired laboratory or treatment values from the same clinical episode whenever the formula assumes that. If an entry is unknown, do not substitute a guess simply to obtain a number.

How the calculation works

The calculator uses a simplified Mendelian ABO model, combining possible A, B, or O alleles from each parent to list possible child ABO groups. Rh is simplified to phenotype-level possibilities rather than full genotype modeling.

Example

Using the sample values prefilled in this calculator, the primary result is A, AB, B, O ABO (Possible child blood groups) and Possible Rh is positive or negative. This example demonstrates the plugin’s own calculation path; replace the sample inputs with verified values before interpreting a real result.

How to interpret the result

Read the output as possible child blood groups derived from the entered laboratory or clinical variables. Use the relevant disease pathway and laboratory context before turning the number into a diagnosis, prognosis, or treatment decision.

Limitations and notes

ABO and Rh genetics are more complex than phenotype-only educational models. Rare variants, cis-AB, weak/partial D, Bombay phenotype, and other genetics can produce outcomes not represented here; blood type must be laboratory tested.