A simple, free BMI calculator to determine your body mass index and understand what it means for your health. Calculate your BMI in seconds using either metric or imperial units.
Body Mass Index (BMI) is a numerical value calculated from your weight and height. It provides a simple way to categorize individuals as underweight, normal weight, overweight, or obese based on tissue mass (muscle, fat, and bone).
The formula for BMI is weight (kg) divided by height squared (m²). While BMI is a useful screening tool, it is important to remember that it does not directly measure body fat or account for factors like muscle mass, bone density, or overall body composition.
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Increased risk of nutritional deficiencies and osteoporosis |
| 18.5 - 24.9 | Normal weight | Lowest risk of health problems |
| 25.0 - 29.9 | Overweight | Increased risk of heart disease, stroke, and type 2 diabetes |
| 30.0 - 34.9 | Obesity (Class 1) | High risk of health problems |
| 35.0 - 39.9 | Obesity (Class 2) | Very high risk of health problems |
| 40.0 and above | Obesity (Class 3) | Extremely high risk of health problems |
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| Gender | Age Group | Recommended Intake | Notes |
|---|---|---|---|
| Men | Adults | About 3.7 liters (15.5 cups) | Includes water from food and beverages |
| Women | Adults | About 2.7 liters (11.5 cups) | Includes water from food and beverages |
| Pregnant Women | Any age | About 3 liters (13 cups) | Increased needs during pregnancy |
| Breastfeeding Women | Any age | About 3.8 liters (16 cups) | Increased needs during lactation |
| Age Group | Recommended Activity | Duration | Frequency |
|---|---|---|---|
| Adults (18-64) | Moderate aerobic activity | 150 minutes | Weekly |
| Adults (18-64) | Vigorous aerobic activity | 75 minutes | Weekly |
| Adults (18-64) | Muscle-strengthening activities | All major muscle groups | 2+ days per week |
| Older Adults (65+) | Moderate aerobic activity | 150 minutes | Weekly |
| Older Adults (65+) | Balance training | Varies | 3+ days per week |
Based on BMI 18.5-24.9 for adults
| Height | Healthy Weight Range (kg) | Healthy Weight Range (lbs) |
|---|---|---|
| 5'0" (152 cm) | 43 - 57 kg | 94 - 126 lbs |
| 5'3" (160 cm) | 47 - 63 kg | 104 - 139 lbs |
| 5'6" (168 cm) | 52 - 70 kg | 115 - 154 lbs |
| 5'9" (175 cm) | 57 - 76 kg | 125 - 168 lbs |
| 6'0" (183 cm) | 62 - 83 kg | 136 - 183 lbs |
| 6'3" (190 cm) | 67 - 90 kg | 147 - 198 lbs |
Important: These tables provide general guidelines. Individual needs may vary based on factors like activity level, metabolism, and specific health conditions. Always consult with healthcare professionals for personalized advice.
Our BMI Calculator allows you to calculate your Body Mass Index based on your height and weight. It helps you understand if your weight is in a healthy range according to standard medical guidelines.
Simply enter your height and weight (in either metric or imperial units), and the calculator will automatically display your BMI value and the corresponding weight category.
Generally, a BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is classified as obese. However, BMI is just one health indicator and doesn't account for factors like muscle mass.
BMI is a useful general guideline, but it has limitations. It doesn't distinguish between muscle and fat, so athletes or muscular individuals may have a high BMI despite being healthy. It also may not be as accurate for elderly people, pregnant women, or certain ethnic groups.
This calculator is designed for adults. BMI for children and teens (aged 2-19) is calculated differently, using age and gender-specific percentiles, as children's body composition changes as they grow.
Yes, we take data security seriously. Your height and weight information is processed locally in your browser and never sent to our servers. This ensures complete privacy and security of your information.
If your BMI falls outside the healthy range, consider consulting with a healthcare professional. They can provide personalized advice based on your overall health, lifestyle, and other factors beyond just BMI.