Health Calculators
Blood Type Calculator
Estimate child ABO and Rh probabilities from two parents’ blood types, with a Punnett-style table and phenotype reference.
Select mother and father phenotypes (A/B/AB/O with Rh+ or Rh−). The tool uses the same population assumptions as blood type calculator: A and B parents are modeled as 75% / 25% AO vs AA or BO vs BB, AB as 50/50 A/B gametes, and O as OO.
Rh probabilities follow Rh+ × Rh+ = 93.75% / 6.25%, Rh+ × Rh− = 75% / 25%, and Rh− × Rh− = 100% Rh−.
Chance for type A
50%
Chance for type B
12.5%
Chance for type AB
37.5%
Chance for type O
0%
Chance for Rh+
75%
Chance for Rh-
25%
| ♂️\♀️ | A | O | A | A |
| A | AA | A0 | AA | AA |
| B | AB | B0 | AB | AB |
Punnet square for possible blood types
| Phenotype | Genotype |
|---|---|
| A | AO or AA |
| B | BO or BB |
| AB | AB |
| O | O |