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BMI Calculator

Calculate your Body Mass Index (BMI) instantly. Check if you're underweight, normal, overweight, or obese. Metric and US units available.

Your Measurements (Metric)
Your Measurements (US)
Tip: 1 foot = 12 inches. For 5'7", enter 67 inches
24.2
Normal Weight
You have a healthy body weight for your height
16 18.5 25 30 35 40+
Underweight
< 18.5
Normal
18.5 - 24.9
Overweight
25 - 29.9
Obese
30+
Healthy Weight Range for Your Height
53.5 kg - 72.0 kg
Based on BMI 18.5 - 24.9
BMI Categories
Category BMI Range Health Risk
Underweight Below 18.5 Increased risk of health problems
Normal Weight 18.5 - 24.9 Lowest risk
Overweight 25 - 29.9 Increased risk
Obese Class I 30 - 34.9 High risk
Obese Class II 35 - 39.9 Very high risk
Obese Class III 40 and above Extremely high risk
Calculation History

How to Calculate BMI

1. Enter Your Weight

Input your weight in kg or lbs

2. Enter Your Height

Input your height in cm or inches

3. Get Your BMI

See your BMI and healthy weight range

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight

BMI Formula

Metric: weight(kg) / height(m)²
US: (weight(lbs) / height(in)²) × 703

Health Implications

BMI helps assess risk for heart disease, diabetes, and other conditions

Limitations

BMI may not be accurate for athletes, elderly, or pregnant women

Frequently Asked Questions

What is BMI?
BMI (Body Mass Index) is a simple calculation using a person's height and weight. It's a screening tool that categorizes individuals into underweight, healthy weight, overweight, and obese categories. BMI is used by healthcare professionals to assess potential health risks.
How is BMI calculated?
For metric measurements: BMI = weight (kg) / height (m)². For US measurements: BMI = (weight (lbs) / height (in)²) × 703. For example, a person weighing 70kg and 170cm tall has a BMI of 70 / (1.7 × 1.7) = 24.2.
What is a healthy BMI?
A healthy BMI range is between 18.5 and 24.9. Below 18.5 is considered underweight, 25-29.9 is overweight, and 30 or above is obese. However, BMI is just one indicator and should be considered alongside other factors like muscle mass, age, and overall health.
Is BMI accurate for everyone?
BMI has limitations. It may overestimate body fat in athletes and muscular individuals, and underestimate it in older adults or those with muscle loss. It's also not suitable for pregnant women, children, or very muscular people. Always consult with a healthcare provider for a complete health assessment.
What's the difference between BMI for men and women?
The BMI formula is the same for both men and women. However, women typically have more body fat than men at the same BMI. Despite this, the same BMI categories are used for both genders as a general screening tool.
How can I improve my BMI?
To improve your BMI, focus on a balanced diet and regular physical activity. If you're underweight, increase calorie intake with nutritious foods. If overweight, create a moderate calorie deficit through diet and exercise. Always consult a healthcare provider before starting any weight management program.

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Health Tip

Regular exercise and balanced diet are key to maintaining a healthy BMI. Aim for 150 minutes of moderate activity per week.

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