BMI Calculator for Men and Women
Free BMI calculator in kg and ft. Choose men or women, enter your weight and height, and see your body mass index, category and healthy weight range instantly.
BMI formula
BMI = Weight (kg)Height (m)²BMI formula in pounds and inches: BMI = 703 × weight (lb) ÷ height (in)². To use feet, convert first: 1 ft = 12 in = 0.3048 m.
BMI is a screening number. It does not measure body fat or muscle.
BMI chart for adults
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Normal weight |
| 25 to 29.9 | Overweight |
| 30 and above | Obese |
How to use this BMI calculator
Pick men or women, enter weight
Choose your gender and type your weight in kg or lb.
Enter your height
Use cm, m, or ft and inches.
Read your result
See your BMI, category and healthy range on the gauge.
BMI calculator for men
Men use the same adult BMI formula and categories. Select Men above for your result and an ideal weight estimate. Men often carry more muscle, so a muscular man can show a high BMI without extra body fat.
BMI calculator for women
Looking for a BMI calculator female version? Select Women above. The adult BMI categories are the same, but women usually have a higher body fat share than men at the same BMI, so a doctor can help you read the result.
BMI calculator in kg and ft
Enter weight in kg and choose ft for height to type feet and inches. Example: 70 kg and 5 ft 7 in. Height = 67 in = 1.7018 m, so 1.7018 × 1.7018 = 2.896. Then 70 ÷ 2.896 = 24.2 (Normal weight).
BMI calculation example
A person who weighs 70 kg and is 170 cm tall: 1.70 × 1.70 = 2.89. Then 70 ÷ 2.89 = 24.2, which is Normal weight.
Frequently asked questions
Is BMI different for men and women?
The formula and adult categories are the same. What differs is body composition, so the same BMI can mean different body fat levels in men and women. This tool shows a separate ideal weight estimate for each.
How do I calculate BMI in kg and ft?
Convert feet and inches to meters (total inches × 0.0254), then divide your weight in kg by height squared. This calculator does it when you choose ft.
What is a healthy BMI range?
For adults, 18.5 to 24.9 is usually called the healthy range. BMI is not for children.
Is BMI an accurate measure of health?
It is a quick screening tool and ignores muscle, age and body shape. Use it with advice from a doctor.
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