BMI Calculator
Your BMI Result
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Your BMI
Health Tips
Calculate your BMI to get personalized health recommendations.
Understanding Body Mass Index (BMI)
Body Mass Index (BMI) is a widely used screening tool that measures the relationship between your weight and height. It provides a general indicator of whether you're at a healthy weight for your height.
How BMI is Calculated
The standard formula for calculating BMI is:
BMI = weight (kg) / height² (m²)
For those using imperial measurements, the formula is:
BMI = (weight (lb) / height² (in²)) × 703
BMI Categories
Based on your BMI result, you'll fall into one of these categories:
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obesity: BMI 30 or greater
Limitations of BMI
While BMI is a useful screening tool, it has limitations:
- Doesn't directly measure body fat
- May overestimate body fat in athletes and those with muscular builds
- May underestimate body fat in older adults and those who have lost muscle mass
- Doesn't account for distribution of fat (waist circumference is also important)
Health Implications
Maintaining a healthy BMI is associated with reduced risk for various health conditions:
- Heart disease and stroke
- Type 2 diabetes
- Certain types of cancer
- Sleep apnea and respiratory problems
- Osteoarthritis
Use our Calorie Calculator to determine your daily calorie needs or our BMR Calculator to find your basal metabolic rate.
Frequently Asked Questions
What is the most accurate BMI calculator?
Our BMI calculator uses the standard formula recommended by health organizations worldwide. For most adults, it provides an accurate assessment of weight category.
How to calculate BMI correctly at home?
Use accurate measurements: stand against a wall to measure height, and use a reliable scale for weight. Our calculator handles the conversions and calculations for you.
Which BMI calculator is best for athletes?
Athletes with high muscle mass may get BMI results that categorize them as overweight. In such cases, body fat percentage measurements may be more appropriate.
Should I trust online BMI calculators?
Our calculator uses the standard formula accepted by health professionals. However, for medical purposes, always consult with a healthcare provider.
Why is BMI calculator important for health tracking?
BMI provides a quick snapshot of your weight status, helping you understand if you're at risk for weight-related health issues.
When to use a BMI calculator during weight loss?
You can use it periodically (monthly) to track progress, but don't rely on it exclusively. Also consider measurements, how clothes fit, and energy levels.