BMI Calculator
Calculate your Body Mass Index and see which health category you fall into.
⚖️ Calculate Your BMI
Your BMI
BMI Calculator — Free Body Mass Index Tool
Calculate your Body Mass Index (BMI) instantly with our free online calculator. Supports both metric (kg/cm) and imperial (lbs/inches) units. Shows your BMI value, category, healthy weight range, and a visual BMI scale — no account or signup required. BMI is a widely used screening tool that estimates body fat based on height and weight....
Calculate your Body Mass Index (BMI) instantly with our free online calculator. Supports both metric (kg/cm) and imperial (lbs/inches) units. Shows your BMI value, category, healthy weight range, and a visual BMI scale — no account or signup required.
BMI is a widely used screening tool that estimates body fat based on height and weight. It's used by healthcare professionals to quickly assess whether a person is in a healthy weight range. While BMI has limitations (it doesn't account for muscle mass, age, or body composition), it remains a useful starting point for discussions about weight and health.
BMI Categories (WHO Standard)
- Underweight: BMI below 18.5
- Normal weight: BMI 18.5–24.9
- Overweight: BMI 25.0–29.9
- Obese (Class I): BMI 30.0–34.9
- Obese (Class II): BMI 35.0–39.9
- Obese (Class III): BMI 40.0 and above
How to Calculate BMI — Step by Step
- Choose unit system: Select metric (kg/cm) or imperial (lbs/inches).
- Enter weight: Input your weight in kilograms or pounds.
- Enter height: Input your height in centimetres or inches.
- Calculate: Click "Calculate BMI" to see your result instantly.
- Review results: Check your BMI value, category, and healthy weight range for your height.
⚠️ BMI is a general screening tool only and does not account for muscle mass, age, gender, or ethnicity. Always consult a healthcare professional for personalised medical advice.
❓ Frequently Asked Questions
According to the WHO, a BMI between 18.5 and 24.9 is considered normal or healthy weight. However, BMI is only one indicator — consult a doctor for a complete health assessment.
BMI can overestimate body fat in athletes and very muscular people, classifying them as overweight despite having low body fat. Body composition measurements are more accurate for athletes.
The same BMI ranges are used for adult men and women. However, women generally have more body fat than men at the same BMI level.
Children's BMI is interpreted differently using age- and sex-specific percentile charts. This calculator is designed for adults.
Yes, 100% free with no account required.
No — BMI is a starting point only. Consult a healthcare professional who can consider your full health picture.
🔗 Related Tools