BMI Health Calculator

Calculate your Body Mass Index instantly with our free online health calculator. Get personalized health recommendations.

BMI Calculator

Enter your height and weight to calculate your Body Mass Index and get personalized health recommendations.

Your Information

cm
kg

Your BMI Result

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BMI Categories

Underweight < 18.5
Normal 18.5 - 24.9
Overweight 25.0 - 29.9
Obese ≥ 30.0

BMI Formula

Understanding how BMI is calculated and what it means for your health.

BMI Calculation

Metric Formula

BMI = weight (kg) ÷ height² (m²)

Imperial Formula

BMI = weight (lb) ÷ height² (in²) × 703

Example Calculation

Height: 170 cm = 1.70 m
Weight: 65 kg
BMI = 65 ÷ (1.70)² = 22.49
Result: Normal weight

BMI Distribution Chart

BMI Calculation Examples

See how BMI calculations work for different body types and learn about healthy weight ranges.

Sarah, 25

Office Worker

Height: 165 cm
Weight: 55 kg
BMI: 20.2
Normal

Mike, 35

Athlete

Height: 180 cm
Weight: 75 kg
BMI: 23.1
Normal

John, 45

Manager

Height: 175 cm
Weight: 85 kg
BMI: 27.8
Overweight

Lisa, 30

Teacher

Height: 160 cm
Weight: 80 kg
BMI: 31.3
Obese

BMI Health Ranges

Category BMI Range Health Risk
Underweight < 18.5 Moderate
Normal 18.5 - 24.9 Low
Overweight 25.0 - 29.9 Moderate
Obese Class I 30.0 - 34.9 High
Obese Class II 35.0 - 39.9 Very High
Obese Class III ≥ 40.0 Extremely High

Calculation History

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