BMI Calculator
Free online BMI Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
BMI = weight(kg) / height(m)^2. For imperial: BMI = weight(lb) / height(in)^2 x 703. Categories: Underweight <18.5, Normal 18.5-24.9, Overweight 25-29.9, Obese 30+.
Example Calculations
Normal Weight
Input: Height: 5'9" (175cm), Weight: 160 lbs (72.5kg)
Result: BMI: 23.6 - Normal weight range
Overweight
Input: Height: 5'6" (168cm), Weight: 185 lbs (84kg)
Result: BMI: 29.9 - Overweight range
Metric Calculation
Input: Height: 1.80m, Weight: 80kg
Result: BMI: 24.7 - Normal weight range
About This Calculator
Free online bmi calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our bmi calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
What is a healthy BMI range?
A healthy BMI is 18.5 to 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
How is BMI calculated?
BMI = weight(kg) / height(m)^2. For imperial: (weight(lb) / height(in)^2) x 703.
Is BMI accurate for everyone?
BMI is useful but limited. It does not distinguish muscle from fat, so athletes may have high BMI despite being healthy.
Health risks of high BMI?
High BMI increases risk of heart disease, type 2 diabetes, high blood pressure, certain cancers, and sleep apnea.
Alternatives to BMI?
Waist circumference, body fat percentage, waist-to-hip ratio, and DEXA scans provide more accurate health assessment.
Can BMI be used for children?
BMI works for children 2+, but results use age- and sex-specific percentile charts rather than adult categories.