BMI Calculator
Calculate your Body Mass Index — check if you're at a healthy weight.
<18.5 Normal
18.5-24.9 Overweight
25-29.9 Obese
≥30
BMI Calculator — Free Online Tool
Our free BMI Calculator helps you determine your Body Mass Index instantly. Enter your height and weight, and we'll calculate your BMI and show you which category you fall into — underweight, normal, overweight, or obese. Supports both metric (kg/cm) and imperial (lb/ft) units.
What is BMI?
Body Mass Index (BMI) is a widely used screening tool that uses your height and weight to estimate body fatness. It's a quick and simple way to check if your weight is in a healthy range for your height. While BMI doesn't directly measure body fat, it correlates well with more direct measures for most people.
BMI Categories
- Underweight — BMI below 18.5. May indicate insufficient nutrition.
- Normal weight — BMI 18.5 to 24.9. Healthy weight range.
- Overweight — BMI 25 to 29.9. Increased health risks.
- Obese — BMI 30 or above. Significantly increased health risks.
BMI Formula
Metric: BMI = weight (kg) ÷ height (m)²
Imperial: BMI = 703 × weight (lb) ÷ height (in)²
Limitations of BMI
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, bone density, overall body composition, or fat distribution. Athletes with high muscle mass may have a high BMI but low body fat. Always consult a healthcare professional for personalized health advice.
Healthy Weight Tips
- Eat a balanced diet rich in fruits, vegetables, and whole grains
- Aim for at least 150 minutes of moderate exercise per week
- Stay hydrated and limit sugary drinks
- Get adequate sleep (7-9 hours for adults)
- Consult your doctor before starting any weight loss program
Disclaimer: This BMI calculator is for informational purposes only and is not a substitute for professional medical advice.