Universal BMI standard
Uses the WHO-standard formula (weight kg ÷ height m²) recognized by healthcare professionals worldwide for quick population-level screening.
Universal BMI Calculator
Calculate Body Mass Index (BMI), ideal weight range, and weight category.
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How to use Universal BMI Calculator
- 1
Select your unit system: metric (cm/kg) or imperial (ft, in/lbs).
- 2
Enter your height and current body weight.
- 3
Click Calculate to see your BMI value and weight category.
- 4
Use the healthy weight range output to set a realistic target.
Why use this tool?
Healthy weight range
Shows the exact weight range classified as healthy for your height so you have a clear, personalized target to work toward.
Metric and imperial
Switch between metric and imperial units at any time without re-entering your data.
Continue your workflow
Determine calorie intake targets based on your weight goals. Daily calorie calculator.
Calculate how many calories you burn per day with exercise. Total daily energy expenditure.
Explore healthy weight ranges based on medical formulas. Ideal body weight.
Frequently asked questions
What is a healthy BMI range?
According to the World Health Organization: Underweight is below 18.5, Normal weight is 18.5–24.9, Overweight is 25–29.9, and Obese is 30 or above. However, BMI is a screening tool, not a diagnostic measure.
Is BMI accurate for everyone?
BMI does not distinguish between muscle mass and fat mass. Highly muscular athletes often have a high BMI without excess body fat. It is also less accurate for children, the elderly, and some ethnic groups. Consult a healthcare professional for a full health assessment.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². In imperial: BMI = 703 × weight (lbs) ÷ height (inches)². For example, a person who is 170 cm and weighs 70 kg has BMI = 70 ÷ 1.70² = 24.2.
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