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Blood Type Calculator

Blood Type Calculator: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

Blood Type Calculator

Mother's blood group (1 = O, 2 = A, 3 = B, 4 = AB)
Mother is Rh-positive (1 = yes)
Father's blood group (1 = O, 2 = A, 3 = B, 4 = AB)
Father is Rh-positive (1 = yes)
Child's group to calculate (1 = O, 2 = A, 3 = B, 4 = AB)
Child Rh-positive (1 = yes)
Chance of the selected child's blood type
91.8367%
Parents' genotypes are estimated from allele frequencies (Europe): O 0.66, A 0.26, B 0.08, Rh d 0.40Blood Type Calculator: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
Group O
100%
Group A
0%
Group B
0%
Group AB
0%
Rh-positive
91.8%

More about: Blood Type Calculator

What it calculates

The “Blood Type Calculator” calculator computes Chance of the selected child's blood type in % from 6 parameters: mother's blood group (1 = o, 2 = a, 3 = b, 4 = ab), mother is rh-positive (1 = yes), father's blood group (1 = o, 2 = a, 3 = b, 4 = ab), father is rh-positive (1 = yes), child's group to calculate (1 = o, 2 = a, 3 = b, 4 = ab), child rh-positive (1 = yes).

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters Mother's blood group (1 = O, 2 = A, 3 = B, 4 = AB) = 1, Mother is Rh-positive (1 = yes) = 1, Father's blood group (1 = O, 2 = A, 3 = B, 4 = AB) = 1, Father is Rh-positive (1 = yes) = 1, Child's group to calculate (1 = O, 2 = A, 3 = B, 4 = AB) = 1, Child Rh-positive (1 = yes) = 1 the result is 91.84 % (Parents' genotypes are estimated from allele frequencies (Europe): O 0.66, A 0.26, B 0.08, Rh d 0.40).

How to use

  1. Enter mother's blood group (1 = o, 2 = a, 3 = b, 4 = ab), mother is rh-positive (1 = yes), father's blood group (1 = o, 2 = a, 3 = b, 4 = ab), father is rh-positive (1 = yes), child's group to calculate (1 = o, 2 = a, 3 = b, 4 = ab) and child rh-positive (1 = yes) — each field above is adjustable with a slider.
  2. Chance of the selected child's blood type (%) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.

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