Health & Fitness100% Free & Instant
BMI & Ideal Body Weight Calculator
Check your Body Mass Index (BMI) with precision. View visual color-coded WHO health risk ranges, healthy target weight, and personalized fitness recommendations.
kg
30 kgEnter current body weight200 kg
cm
100 cm1.72 meters / 5.6 feet230 cm
Body Mass Index
Normal Weight23 kg/m²
10 (Under)18.524.930.040+ (Obese)
Health Assessment:
Excellent! You are in the optimal healthy weight range according to WHO guidelines.
Healthy Weight Range
54.7 kg – 73.7 kg
Target Difference
Optimal Weight ✓
Formula & Mathematical Definition
Body Mass Index (BMI) is calculated using standard World Health Organization (WHO) biometric equations:
Metric System
BMI = Weight (kg) ÷ [Height (m)]²Imperial System
BMI = [Weight (lbs) ÷ Height (in)²] × 703How to Use & Step-by-Step Example
- Select Preferred Units: Choose Metric (kg, cm) or Imperial (lbs, feet/inches).
- Enter Weight & Height: Use the interactive sliders or type numbers directly.
- Inspect Color Gauge: The visual marker immediately points to your classification on the WHO spectrum.
- Check Healthy Target Weight: Review your target weight range and required surplus/deficit in kg.
Standard Reference Slabs & Benchmarks
| BMI Range (kg/m²) | WHO Category Classification | Health & Cardiovascular Risk |
|---|---|---|
| < 18.5 | Underweight | Nutritional deficiency risk |
| 18.5 – 24.9 | Normal / Healthy Weight | Lowest health risk (Optimal) |
| 25.0 – 29.9 | Overweight (Pre-obese) | Moderate cardiovascular risk |
| 30.0 – 34.9 | Obesity Class I | High risk |
| 35.0 – 39.9 | Obesity Class II | Very High risk |
| ≥ 40.0 | Obesity Class III (Severe) | Extremely High / Clinical risk |
Frequently Asked Questions (FAQ)
Body Mass Index (BMI) is an international screening tool used by healthcare organizations (such as WHO) to assess body weight relative to height and categorize individuals into Underweight, Normal, Overweight, or Obese.
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