Health
BMI Calculator
Calculate your Body Mass Index (BMI) to see if you're at a healthy weight for your height.
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Formula
BMI = weight (kg) / height² (m²)
How It Works
BMI (Body Mass Index) is a measure of body fat based on height and weight.
BMI Categories:
• Under 18.5 - Underweight
• 18.5 to 24.9 - Normal weight
• 25 to 29.9 - Overweight
• 30 and above - Obese
Note: BMI doesn't account for muscle mass, age, or body composition. Athletes may have high BMI but low body fat.
Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a general indicator but doesn't distinguish between muscle and fat. It may overestimate body fat in athletes and underestimate in elderly people.
What's a healthy BMI?
A BMI between 18.5 and 24.9 is considered normal weight. However, health depends on many factors beyond BMI.
How often should I check my BMI?
Checking monthly or quarterly is sufficient for tracking changes. Daily fluctuations in weight are normal.
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Part of the ZIPP family of free online tools