BMI Calculator
Calculate your Body Mass Index (BMI) and get instant health insights. Free, accurate, and easy to use with support for both Imperial and Metric units.
Disclaimer: This BMI calculator is for informational purposes only and should not be considered medical advice. Please consult with a healthcare professional for personalized health guidance.
What is BMI?
Body Mass Index (BMI) is a numerical value derived from your weight and height. It's a widely used screening tool to categorize individuals into different weight categories that may lead to health problems.
BMI is calculated by dividing a person's weight by the square of their height. While it doesn't directly measure body fat, it provides a reasonable indicator of body fatness for most people and is used to screen for weight categories.
The BMI calculator is a useful tool for adults aged 20 and older. For children and teens, BMI is age and sex-specific and is often referred to as BMI-for-age.
How to Calculate BMI
Imperial Formula (US Units)
Example: If you weigh 150 lbs and are 5'8" (68 inches) tall:
BMI = (150 / (68 × 68)) × 703 = 22.8
Metric Formula
Example: If you weigh 70 kg and are 170 cm (1.7 m) tall:
BMI = 70 / (1.7 × 1.7) = 24.2
BMI Categories
| Category | BMI Range | Health Risk |
|---|---|---|
Underweight | < 18.5 | Increased risk of malnutrition |
Normal Weight | 18.5 - 24.9 | Healthy weight range |
Overweight | 25 - 29.9 | Increased risk of health issues |
Obese | ≥ 30 | High risk of health complications |
Limitations and Considerations
Doesn't Measure Body Fat Directly
BMI doesn't distinguish between muscle mass and fat mass. Athletes with high muscle mass may have a high BMI but low body fat.
Age and Gender Variations
BMI doesn't account for age, gender, or ethnicity differences. The same BMI may represent different levels of body fat in different populations.
Not Suitable for Everyone
BMI may not be accurate for pregnant women, children, elderly individuals, or people with certain medical conditions.
Use as a Screening Tool
BMI should be used as a screening tool, not a diagnostic tool. Consult healthcare professionals for comprehensive health assessments.
Health Tips Based on BMI
🥗Balanced Diet
Focus on whole foods, fruits, vegetables, lean proteins, and whole grains for optimal nutrition.
🏃Regular Exercise
Aim for at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity per week.
💧Stay Hydrated
Drink plenty of water throughout the day to support metabolism and overall health.
😴Quality Sleep
Get 7-9 hours of quality sleep each night to support weight management and overall wellness.