Quickly calculate your Body Mass Index using metric units. Fast, accurate, and easy-to-use.
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Standard World Health Organization thresholds for metric weight and height
| Category | BMI Range (kg/m²) | Health Risk Description | Weight Range Status |
|---|---|---|---|
| Underweight | Less than 18.5 | Risk of nutritional deficiency and bone density loss. | Moderate |
| Normal weight | 18.5 – 24.9 | Lowest overall risk for chronic cardiovascular disease. | Low (Optimal) |
| Overweight | 25.0 – 29.9 | Increased risk of developing diabetes and blood pressure issues. | Elevated |
| Obese (Class I) | 30.0 – 34.9 | High risk of metabolic syndrome and joint deterioration. | High |
| Obese (Class II) | 35.0 – 39.9 | Very high risk of heart conditions, stroke, and sleep apnea. | Very High |
| Obese (Class III) | 40.0 and above | Extremely high clinical risk for overall systemic disease. | Extreme |
In international clinical medicine, healthcare monitoring, and global fitness, standardizing body weight metrics is essential. The **Body Mass Index (BMI)** serves as the primary epidemiological tool to estimate body fat levels and screen for weight-related health risks. While certain countries (like the United States) frequently use imperial units (pounds and inches), the vast majority of the world utilizes the **Metric System**—relying on **kilograms (kg) for weight and centimeters (cm) or meters (m) for height**. This guide provides a detailed, step-by-step breakdown of how to calculate your BMI in metric units, metric-to-imperial conversion tables, and standard health charts.
Calculating your BMI in the metric system is direct and mathematically elegant. The formula is defined as your weight in kilograms divided by your height in meters squared:
BMI = Weight (kg) / [Height (m)]²
Because most people know their height in centimeters (cm) rather than meters (m), you must first convert centimeters to meters. There are 100 centimeters in 1 meter, so you simply divide your height by 100. Here is the exact step-by-step process:
Divide your height in centimeters by 100. For example, if you stand 175 cm tall:
175 cm / 100 = 1.75 meters
Multiply the result from Step 1 by itself. This gives your height in meters squared:
1.75 × 1.75 = 3.0625 m²
Take your current weight in kilograms and divide it by the number from Step 2. For example, if you weigh 70 kg:
BMI = 70 / 3.0625 = 22.85
Your calculated BMI score is **22.85**, which falls comfortably in the healthy normal range (18.5 – 24.9).
If you are accustomed to measuring your height in feet and inches and your weight in pounds, you can convert those values to metric equivalents using these standard reference charts:
| Height (Imperial) | Height (Metric Centimeters) | Height (Metric Meters) |
|---|---|---|
| 5 feet 0 inches (5'0") | 152.4 cm | 1.52 m |
| 5 feet 3 inches (5'3") | 160.0 cm | 1.60 m |
| 5 feet 6 inches (5'6") | 167.6 cm | 1.68 m |
| 5 feet 9 inches (5'9") | 175.3 cm | 1.75 m |
| 6 feet 0 inches (6'0") | 182.9 cm | 1.83 m |
| 6 feet 3 inches (6'3") | 190.5 cm | 1.91 m |
| Weight (Imperial Pounds) | Weight (Metric Kilograms) |
|---|---|
| 100 lbs | 45.4 kg |
| 120 lbs | 54.4 kg |
| 140 lbs | 63.5 kg |
| 160 lbs | 72.6 kg |
| 180 lbs | 81.6 kg |
| 200 lbs | 90.7 kg |
| 220 lbs | 99.8 kg |
Using the metric system is highly recommended because it is the baseline standard for clinical research. When communicating with physicians, clinical staff, or using health calculators, metric parameters prevent rounding errors. For instance, computing BMR using Mifflin-St Jeor or calculating Lean Body Mass uses metric values as their baseline. You can calculate your resting caloric requirements with the BMR Calculator, determine your fat-free tissue ratio with the Lean Body Mass Calculator, or customize macronutrient distributions with the Macro Calculator.
