BMI Calculator
BMI Calculator
Calculate your Body Mass Index (BMI) with this easy-to-use calculator. BMI is a measurement of body fat based on height and weight.
Input Measurements
Choose between metric (kg/cm) or imperial (lb/in) units
Your weight in kilograms
Your height in centimeters
Your weight in pounds
Your height in feet
Additional inches
Calculation Formula
BMI = weight (kg) / height² (m²)
BMI = 703 × weight (lb) / height² (in²)
Results
15
18.5
25
30
35
40+
Your BMI
24.2
Normal weight
BMI Categories
Underweight
BMI less than 18.5
Normal weight
BMI 18.5 to 24.9
Overweight
BMI 25 to 29.9
Obesity Class I
BMI 30 to 34.9
Obesity Class II and higher
BMI 35 or greater
Information & FAQs
What is BMI?
BMI (Body Mass Index) is a measurement of body fat based on height and weight that applies to adult men and women. It is a simple way to screen for weight categories that may lead to health problems, but it does not diagnose the body fatness or health of an individual.
Frequently Asked Questions
Is BMI accurate for everyone?
BMI may not be accurate for athletes, elderly individuals, or pregnant women. Athletes may have higher weight due to muscle mass, not fat. BMI also doesn't account for where fat is stored on the body, which impacts health risks.
How often should I check my BMI?
For most adults, checking BMI once or twice a year is sufficient. If you're actively trying to lose or gain weight, you might want to check more frequently, but remember that weight can fluctuate day to day.
What are alternatives to BMI?
Alternative measurements include waist circumference, waist-to-hip ratio, body fat percentage, and bioelectrical impedance analysis. These can provide more detailed information about body composition.
Can children use this BMI calculator?
No, this calculator is for adults. Children and teens should use age and sex-specific BMI calculators, as their body composition changes with growth. Consult a pediatrician for proper assessment.
How can I lower my BMI?
To lower BMI, focus on a balanced diet with calorie control, regular physical activity (both cardio and strength training), adequate sleep, stress management, and consistent habits. Consult healthcare providers before starting any weight loss program.
Does BMI consider age and gender?
Standard BMI calculations for adults don't account for age, gender, or body composition differences. Some newer BMI calculators offer adjustments for these factors, but they're not universally used.
What health risks are associated with high BMI?
Higher BMI is associated with increased risk of heart disease, type 2 diabetes, high blood pressure, certain cancers, sleep apnea, and joint problems. However, BMI alone doesn't determine overall health.
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