Calculate your BMI instantly with our free calculator. Get personalized health recommendations based on your weight and height
Select metric (kg/cm) or imperial (lbs/in) units using the toggle.
Input your current weight and height in the respective fields.
View your BMI score, category, and personalized health recommendations instantly.
Our free BMI Calculator helps you determine your Body Mass Index quickly and accurately. Whether you prefer metric (kg/cm) or imperial (lbs/in) units, get instant results with personalized health recommendations based on your BMI category.
Body Mass Index is a widely-used screening tool that relates your weight to your height. While it's not a perfect measure of health, BMI provides a useful starting point for understanding your weight category and potential health risks associated with being underweight, normal weight, overweight, or obese.
BMI is calculated using a simple formula that divides your weight by the square of your height. For metric units, it's weight (kg) / height (m)². For imperial units, it's weight (lbs) / height (in)² × 703.
BMI = weight (kg) / [height (m)]²
Example: 70 kg / (1.75 m)² = 22.9
BMI = [weight (lbs) / height (in)²] × 703
Example: (154 lbs / 69²) × 703 = 22.7
BMI values are categorized into ranges that indicate different weight statuses. Understanding these categories can help you assess your health and set appropriate goals.
< 18.5
May indicate malnutrition or health issues
18.5 - 24.9
Healthy weight range for most adults
25 - 29.9
Higher risk for health problems
≥ 30
Significantly increased health risks
Using a BMI calculator provides several advantages for health monitoring and fitness planning:
Track your body mass index over time to monitor your health progress and weight management goals.
Use BMI as a baseline metric to create effective fitness and nutrition plans tailored to your body type.
Healthcare professionals use BMI for initial health screenings and risk assessments for weight-related conditions.
Determine your ideal weight range and set realistic weight loss or gain targets based on BMI categories.
BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared (kg/m²), or weight in pounds divided by height in inches squared, multiplied by 703.
A healthy BMI typically falls between 18.5 and 24.9. Below 18.5 is considered underweight, 25-29.9 is overweight, and 30 or above is classified as obese. However, BMI should be one of several health indicators.
BMI is a useful screening tool but not perfect. It doesn't account for muscle mass, bone density, age, or gender differences. Athletes with high muscle mass may have high BMI but low body fat.
This calculator is designed for adults (18+ years). Children and teens require age and gender-specific BMI-for-age percentile charts because body composition changes significantly during growth.
For general health monitoring, checking BMI monthly or quarterly is sufficient. If you're actively working on weight management, weekly or bi-weekly checks can help track progress without becoming obsessive.
BMI doesn't distinguish between muscle and fat, doesn't account for distribution of fat, and may not be accurate for pregnant women, elderly individuals, or certain ethnic groups with different body compositions.
Consult with a healthcare provider who can assess your overall health, including body composition, diet, and lifestyle. They can provide personalized recommendations for achieving a healthy weight.
The BMI calculation is the same for both genders, but interpretation may vary slightly. Women naturally have more body fat than men, so the same BMI may represent different body compositions.
Higher BMI is associated with increased risk of conditions like heart disease, diabetes, and high blood pressure. However, BMI should be combined with other health indicators like waist circumference and blood tests.
BMI is a simple calculation using height and weight, while body fat percentage measures the actual proportion of fat in your body. Body fat percentage is more accurate but requires specialized equipment to measure.
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