Blood Type (ABO & Rh) Calculator

Estimate possible child blood types from parents’ ABO and Rh factors

Live

Enter parents’ blood types

👩‍🍼 Mother blood type

Pick the full type (ABO + Rh). Leave blank to clear results.

👨‍🍼 Father blood type

ABO rules: A/B codominant, O recessive. Rh: + dominant over −.

Results

Chance for type A

—%

Chance for type B

—%

Chance for type AB

—%

Chance for type O

—%

Chance for Rh+

—%

Chance for Rh−

—%

Select both parents to see probabilities instantly.

Action

Educational tool only — real genotype frequencies vary by population.

More of our calculators...

Cholesterol Ratio Calculator

Free cholesterol ratio calculator. Enter total, HDL, LDL and triglycerides to get TC/HDL, LDL/HDL, TG/HDL, non-HDL and estimated LDL in seconds.

ABSI (A Body Shape Index) Calculator

Calculate your A Body Shape Index (ABSI) from height, weight and waist circumference. Understand your body shape risk instantly with this free online ABSI calculator.

FFMI Calculator (Fat-Free Mass Index)

Use our FFMI calculator to estimate fat-free mass, FFMI, and normalized FFMI from your weight, body fat percentage, and height. Instantly see your muscle category.

Waist-to-Height Ratio (WHtR) Calculator

Free waist-to-height ratio calculator. Enter your height and waist in cm or inches to get WHtR, health risk category, and simple interpretation.

Adjusted Body Weight Calculator

Calculate adjusted body weight (AjBW) using Robinson IBW + 0.4× rule. Easy AjBW calculator for obese patients, ideal body weight and dosing weight in kg or lb.

Waist-to-Hip Ratio (WHR) Calculator

Use our waist-to-hip ratio calculator to quickly assess your body shape and health risk. Supports cm and inches, with separate cut-offs for men and women.

Ideal Weight Calculator

Free ideal weight calculator using the Devine formula. Enter your height and weight to find your ideal body weight in kg and lb instantly.

Body Fat Calculator

Free body fat calculator using U.S. Navy and BMI formulas. Enter height, weight and measurements in cm/in or kg/lb to estimate body fat percentage.

Lean Body Mass Calculator

Free lean body mass calculator using the Boer formula, with an optional body fat% method. Enter your weight and height in kg/lb and cm/in to estimate LBM and fat mass.