BMI Calculator
Calculate your BMI instantly with kg/lbs and cm/ft toggle support. Get a color-coded health category, visual gauge, and ideal weight range for your height.
kg
cm
BMI Categories
Underweight< 18.5
Normal weight18.5 – 24.9
Overweight25 – 29.9
Obese≥ 30
Enter your weight and height to calculate your BMI.
Features
- Supports Metric (kg, cm) and Imperial (lbs, ft/in) units
- Color-coded categories: Underweight, Normal, Overweight, Obese
- Visual BMI gauge chart for quick reading
- Ideal weight range based on your exact height
- Instant results — no button press needed
- 100% private — no data sent to any server
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a numerical value calculated from a person's weight and height. It is a widely used screening tool to identify weight categories — underweight, normal weight, overweight, and obese — that may lead to health problems.
What is a healthy BMI range?
For adults, a BMI between 18.5 and 24.9 is considered healthy or normal. A BMI below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese. These ranges may differ slightly for children and certain ethnic groups.
How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in metres: BMI = kg / m². In Imperial units: BMI = (lbs / in²) × 703. Our calculator handles both formulas automatically.
Is BMI an accurate measure of health?
BMI is a useful population-level screening tool but has limitations for individuals. It does not directly measure body fat or muscle mass. Athletes with high muscle mass may have a high BMI but low body fat. Always consult a healthcare professional for a full health assessment.
What is the ideal weight for my height?
Ideal weight varies by height and is typically the weight range that puts you in the normal BMI category (18.5–24.9). Our BMI calculator automatically calculates and displays your ideal weight range based on your entered height.