BMI calculator for men
BMI uses the same formula for men and women, but body composition differs significantly. Men typically carry less body fat than women at the same BMI and have more muscle mass. Enter your details to see your BMI, WHO category, and the healthy weight range for your height.
How it works
After converting any imperial inputs to kilograms and metres, the WHO formula weight(kg) / height(m)^2 produces your BMI in one step. The calculator then maps the result onto the WHO categories and also computes the healthy weight band by rearranging the same formula at the 18.5 and 24.9 boundaries for your height, so muscular athletes can see how close they are to the next category.
Processing runs in your browser
All calculations happen locally in your browser tab. Our servers are not involved at any point.
Technical specification
The BMI formula was standardised by the WHO Technical Report Series 894 (2000): BMI = weight(kg) / height(m)². WHO classifies BMI into four categories for adults: Underweight (<18.5), Normal weight (18.5–24.9), Overweight (25.0–29.9), and Obese (≥30.0). BMI does not distinguish between muscle and fat mass and is intended as a population-level screening tool, not an individual diagnostic.
- Formula
- weight(kg) / height(m)²
- Standard
- WHO Technical Report Series 894 (2000)
- Normal range
- 18.5 – 24.9
- Browser API
- Pure JavaScript arithmetic. No library
Related operations
To estimate daily energy needs, try the calorie calculator. For body composition with circumference measurements, use the body fat calculator. To find a reference weight range for your height, see the ideal weight calculator.
Frequently asked questions
- What is a healthy BMI for a man?
- The WHO healthy range of 18.5–24.9 applies to adult men. However, men with high muscle mass (such as athletes or those who lift weights regularly) may have a BMI in the overweight range while having a healthy body fat percentage.
- Is the BMI formula different for men?
- No, the same formula (weight ÷ height²) is used for everyone. The WHO category thresholds are also the same. BMI does not directly account for the difference in body composition between sexes.
- At what BMI is a man considered overweight?
- A BMI of 25.0–29.9 is classified as overweight by the WHO. A BMI of 30 or above is classified as obese. These thresholds apply regardless of sex.
- Is my data sent to a server?
- All calculations are pure JavaScript running in your browser. Our servers are not involved at any point.
Last reviewed May 26, 2026