BMI Calculator – Body Mass Index & Healthy Weight Range
Calculate your BMI and understand your body mass index category based on height and weight.
Calculator
How to Calculate
- 1Enter your weight in the weight field
- 2Select your weight unit (kilograms or pounds)
- 3Enter your height
- 4Select your height unit (centimeters or feet+inches)
- 5If using feet+inches, enter both feet and inches separately
- 6Optionally enter your gender and age (these are for informational purposes only)
- 7Click 'Calculate' to see your BMI and category
- 8Review the category description and healthy weight range for your height
- 9Read the insights to understand what your BMI means
Calculation Examples
Example 1: Normal Weight (Metric)
Input Values
Calculation Steps
- Weight: 70 kg
- Height: 175 cm = 1.75 meters
- BMI formula: BMI = weight (kg) / height (m)²
- BMI = 70 / (1.75)²
- BMI = 70 / 3.0625
- BMI = 22.9
- Category: Normal (BMI 18.5-24.9)
- This BMI falls within the healthy weight range
Calculated Results
Expected Result
A BMI of 22.9 indicates a normal, healthy weight. This person is within the recommended weight range for their height. The healthy weight range for someone 175 cm tall is approximately 57-76 kg.
Example 2: Overweight (Metric)
Input Values
Calculation Steps
- Weight: 90 kg
- Height: 180 cm = 1.80 meters
- BMI formula: BMI = weight (kg) / height (m)²
- BMI = 90 / (1.80)²
- BMI = 90 / 3.24
- BMI = 27.8
- Category: Overweight (BMI 25-29.9)
- This BMI indicates the person may be overweight
Calculated Results
Expected Result
A BMI of 27.8 falls into the overweight category. While this is above the normal range, it's important to remember that BMI is a screening tool and doesn't account for muscle mass. For someone 180 cm tall, a healthy weight range is approximately 60-81 kg. Consider consulting with a healthcare provider for personalized guidance.
Example 3: Imperial Units (Pounds and Feet+Inches)
Input Values
Calculation Steps
- Weight: 150 lb
- Convert to kg: 150 lb × 0.453592 = 68.04 kg
- Height: 5 ft 10 in
- Convert to meters: (5 × 0.3048) + (10 × 0.0254) = 1.524 + 0.254 = 1.778 meters
- BMI formula: BMI = weight (kg) / height (m)²
- BMI = 68.04 / (1.778)²
- BMI = 68.04 / 3.163
- BMI = 21.5
- Category: Normal (BMI 18.5-24.9)
- This BMI indicates a healthy weight
Calculated Results
Expected Result
A BMI of 21.5 falls within the normal, healthy weight range. This demonstrates how the calculator handles unit conversions automatically. For someone 5'10" tall, a healthy weight range is approximately 129-174 pounds.
Example 4: Borderline Category
Input Values
Calculation Steps
- Weight: 77 kg
- Height: 176 cm = 1.76 meters
- BMI formula: BMI = weight (kg) / height (m)²
- BMI = 77 / (1.76)²
- BMI = 77 / 3.0976
- BMI = 24.8
- Category: Normal (BMI 18.5-24.9)
- This BMI is at the upper end of the normal range, close to overweight
Calculated Results
Expected Result
A BMI of 24.8 is at the upper limit of the normal range (24.9). While still considered normal, this is close to the overweight category. It's important to maintain a balanced diet and regular physical activity. Remember that BMI categories are guidelines, and individual factors like muscle mass, bone density, and body composition should also be considered.
Frequently Asked Questions
Find answers to common questions about using this calculator. If you have additional questions, feel free to explore the examples above or contact our support team.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Individual results may vary based on genetics, body composition, medical conditions, medications, and other factors. Always consult with a healthcare provider or registered dietitian before making significant changes to your diet, exercise routine, or health-related decisions.