Use this accurate BMI calculator to check your Body Mass Index using weight in kg and height in feet or meters.
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The World Health Organization classifies BMI into four main categories for adults aged 18 and over.
BMI < 18.5
May indicate nutritional deficiency or other underlying health concerns. A doctor's guidance is recommended.
BMI 18.5 - 24.9
Associated with the lowest health risks for most adults. Maintain with a balanced diet and regular activity.
BMI 25 - 29.9
Slightly elevated risk of developing chronic conditions. Lifestyle modifications may be beneficial.
BMI ≥ 30
Higher risk of conditions like type 2 diabetes and heart disease. Seek professional medical advice.
Body Mass Index (BMI) is a simple numerical value calculated from a person's weight and height. It provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.
First developed by Belgian mathematician Adolphe Quetelet in the 1830s, BMI remains one of the most widely used health screening tools by doctors, researchers, and public health organisations worldwide.
BMI is calculated by dividing your weight in kilograms by the square of your height in metres:
For imperial units, the formula adjusts to: BMI = 703 × weight (lb) ÷ height² (in²). Our calculator handles both unit systems automatically.
While useful as a general screening tool, BMI has known limitations. It does not directly measure body fat or account for muscle mass, bone density, age, sex differences, or ethnicity. Athletes may register as "overweight" despite being very healthy, while some older adults may fall in the "normal" range despite carrying excess fat.
Always use BMI alongside other health indicators and consult a qualified healthcare professional before making any health decisions.
Everything you need to know about BMI, BMI calculation formula, BMI chart categories, and how to use this accurate BMI calculator in kg and feet.
This BMI calculator uses the official BMI calculation formula recommended by the World Health Organization (WHO): BMI = weight (kg) ÷ height (m²). Simply enter your weight in kilograms and your height in feet or meters. It works as a BMI calculator in kg and feet, making it convenient for users in Nepal and other countries using metric units.
Yes. This is an accurate BMI calculator based on the standard WHO formula. However, BMI is a screening tool and does not directly measure body fat percentage. Highly muscular individuals may have a higher BMI despite having low body fat. For best results, use BMI alongside other health indicators.
For adults aged 18 and above, a healthy BMI for men and women is between 18.5 and 24.9. According to Asian health guidelines, including populations similar to Nepal, health risks may begin at a BMI above 23. This means slightly lower thresholds may apply compared to Western standards.
According to the standard BMI chart: Underweight is below 18.5, Normal weight is 18.5-24.9, Overweight is 25-29.9, and Obesity is 30 or higher. These categories help identify potential health risks related to weight, including heart disease, diabetes, and high blood pressure.
This BMI calculator for women works for adult females aged 18 and above. For girls under 18, BMI must be interpreted using age- and sex-specific percentile charts instead of standard adult BMI categories. For children and teenagers, consult a healthcare professional or use a child-specific BMI calculator.
BMI categories remain the same for adults, but body composition naturally changes with age. A BMI calculator kg with age can help monitor trends over time. Older adults may have different muscle-to-fat ratios, so BMI should be interpreted alongside overall health assessments.
Checking your BMI every 3-6 months is generally sufficient for tracking long-term weight trends. Daily or weekly checks are usually unnecessary. Focus on consistent lifestyle habits rather than short-term fluctuations in weight.
No. This online BMI calculator does not store, track, or share your personal data. All calculations happen securely in your browser. Your height, weight, and health information remain completely private.