WHO Body Mass Index (BMI) & Ideal Weight Calculator — ZYCalculator

A BMI calculator measures Body Mass Index by dividing weight in kilograms by height in meters squared and classifies results using WHO health categories.

Formula & Method

BMI = Weight (kg) ÷ [ Height (m) ]² | Healthy Range: 18.5 ≤ BMI ≤ 24.9

How to Use

  1. Select Unit System: Choose Metric (cm, kg) or Imperial (ft, lbs).
  2. Input Height & Weight: Use responsive sliders or number inputs to enter current stats.
  3. Read Speedometer & Health Targets: Check WHO classification, healthy weight target range, and Devine ideal weight.

Frequently Asked Questions

What is Body Mass Index (BMI) and how is it calculated?

BMI is calculated as weight in kilograms divided by the square of height in meters: BMI = weight (kg) ÷ (height (m))². For imperial units: BMI = (weight (lbs) × 703) ÷ (height (in))².

What are the standard WHO BMI weight categories?

Underweight: BMI < 18.5, Normal weight: 18.5 ≤ BMI < 25.0, Overweight: 25.0 ≤ BMI < 30.0, Obese: BMI ≥ 30.0.