Body fat calculator

BMI Calculator

Use this free BMI calculator to check your body mass index (BMI) and see if you're in a healthy weight range.

Unit System: Metric (cm/kg) Imperial (ft-lbs)

Height (cm):

Weight (kg):

Height (ft):

Height (in):

Weight (lbs):

Your BMI Result

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Enter your details to calculate

BMI Categories:

• Underweight: BMI < 18.5
• Normal weight: BMI 18.5–24.9
• Overweight: BMI 25–29.9
• Obese: BMI ≥ 30

What is BMI?

BMI (Body Mass Index) is a numerical value calculated from your weight and height. It provides a simple way to categorize whether a person is underweight, normal weight, overweight, or obese.

How to Use This BMI Calculator

1. Select your preferred unit system (Metric or Imperial)
2. Enter your height and weight
3. Click "Calculate BMI"
4. Check your BMI category in the results

BMI Categories

• Underweight: BMI below 18.5
• Normal weight: BMI 18.5–24.9
• Overweight: BMI 25–29.9
• Obese: BMI 30 or higher

Limitations of BMI

While BMI is a useful screening tool, it has some limitations:

• Doesn't directly measure body fat
• May overestimate body fat in muscular individuals
• May underestimate body fat in older adults who have lost muscle
• Doesn't account for differences in body composition

Frequently Asked Questions

Is BMI accurate for everyone?

BMI is a general indicator but may not be accurate for athletes (who have more muscle) or elderly individuals (who may have less muscle). Other measurements like waist circumference may provide additional information.

What is a healthy BMI?

A BMI between 18.5 and 24.9 is generally considered healthy. However, optimal BMI may vary based on factors like age, sex, and muscle mass.

How often should I check my BMI?

For most adults, checking BMI every 3-6 months is sufficient unless you're actively trying to lose or gain weight.

BMI Chart for Adults

Here's a quick reference BMI chart:

BMI	Weight Status
Below 18.5	Underweight
18.5–24.9	Normal weight
25.0–29.9	Overweight
30.0 and Above	Obese

Take Action Based on Your BMI

If your BMI falls outside the normal range:

• Underweight: Consider consulting a doctor about healthy weight gain strategies
• Overweight/Obese: Small lifestyle changes like increased physical activity and healthier eating can help
• Normal weight: Maintain your healthy habits

Note: This BMI calculator provides general information. For personalized health advice, please consult a healthcare professional.