BMI Calculator
Calculate your Body Mass Index (BMI) to assess your weight status and get personalized health recommendations. Our BMI calculator uses the standard WHO formula and provides detailed analysis.
What is Body Mass Index (BMI)?
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The BMI formula is weight (kg) ÷ [height (m)]². It provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.
BMI is used by healthcare professionals worldwide as a quick and easy method to assess whether someone has a healthy body weight for their height. While it doesn't directly measure body fat, research shows that BMI correlates with direct measures of body fat.
BMI Categories (Adults):
Calculate Your BMI
Your BMI Results
Weight Status
Current BMI:
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Category:
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Health Recommendations
Ideal Weight Range
BMI Categories and Chart
BMI Categories for Adults
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | Below 18.5 | Increased risk |
| Normal weight | 18.5 - 24.9 | Lowest risk |
| Overweight | 25.0 - 29.9 | Increased risk |
| Obese Class I | 30.0 - 34.9 | High risk |
| Obese Class II | 35.0 - 39.9 | Very high risk |
| Obese Class III | 40.0 and above | Extremely high risk |
BMI Visual Scale
BMI Formula
Metric: BMI = weight (kg) ÷ [height (m)]²
Imperial: BMI = [weight (lb) ÷ height (in)²] × 703
BMI Calculation History
Your BMI calculations will appear here...
BMI Limitations
Muscle vs. Fat: BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may have high BMI but low body fat.
Age and Gender: BMI doesn't account for age or gender differences in body composition.
Body Frame: People with different body frame sizes may have different healthy BMI ranges.
Ethnicity: Health risks associated with BMI may vary among different ethnic groups.
Healthy Weight Tips
Balanced Diet: Focus on whole foods, fruits, vegetables, lean proteins, and whole grains.
Regular Exercise: Aim for at least 150 minutes of moderate aerobic activity weekly.
Stay Hydrated: Drink plenty of water throughout the day.
Adequate Sleep: Get 7-9 hours of quality sleep per night.
Consult Professionals: Work with healthcare providers for personalized advice.
Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations. It may not be accurate for athletes, elderly people, or those with certain medical conditions.
What's a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. However, individual factors should be considered.
How often should I calculate my BMI?
Monthly or quarterly calculations are sufficient for monitoring. Daily calculations aren't necessary as weight naturally fluctuates.
Can children use this calculator?
This calculator is designed for adults. Children and teens need special BMI-for-age percentile charts as their body composition changes with growth.
What if my BMI is outside the normal range?
Consult with a healthcare professional who can assess your overall health and provide personalized recommendations.
Does BMI account for pregnancy?
No, standard BMI calculations don't apply during pregnancy. Pregnant women should consult their healthcare provider for appropriate weight monitoring.