Ideal Weight & BMI Calculator
Enter your height and sex to get your standard weight and healthy range; add weight for BMI, and age for your BMR and daily calories. In-browser, free.
Enter your weight to get BMI and the standard comparison.
※ Standard weight uses BMI 22 for men and 21 for women. BMI categories follow the Asia-Pacific criteria (normal 18.5–22.9, overweight 23–24.9, obese ≥25). BMR is a Mifflin-St Jeor estimate and is not medical advice.
🔒 Your inputs are calculated in the browser and never sent to a server.
Standard weight and a healthy range from height and sex
Type in your height and pick your sex, and the standard weight appears immediately. Standard weight is your height in metres squared times a target BMI — 22 for men and 21 for women — so a 170 cm man lands around 22 × 1.7 × 1.7 ≈ 63.6 kg. Alongside it you get a healthy weight range, the band of weights that fall within a normal BMI of 18.5 to 22.9, which is a more realistic target than a single number when you are setting a goal.
BMI and how your weight compares
Add your weight and the tool shows your Body Mass Index and a category — underweight, normal, overweight or obese — using the Korean Society for the Study of Obesity's Asia-Pacific cut-offs (normal 18.5–22.9, overweight 23–24.9, obese 25 and above), which are stricter than the WHO's global thresholds. It also shows your weight as a percentage of the standard weight, where 90 to 110 percent is considered the normal range.
Basal metabolic rate and daily calories
Add your age and the calculator estimates your basal metabolic rate with the Mifflin-St Jeor equation, then multiplies it by the activity level you choose to give an estimate of your daily calorie needs. It is a useful starting point for planning a diet, but treat it as an estimate: muscle mass, body composition and health all shift the real figure, and it is not a substitute for medical advice. Everything is calculated in your browser and never sent to a server.
Frequently asked questions
How is the standard weight calculated?
It multiplies your height in metres squared by a target BMI — 22 for men and 21 for women. For a 170 cm man that is about 63.6 kg. The healthy range shown next to it is the span of weights that fall within a normal BMI of 18.5 to 22.9.
Which BMI categories does it use?
The Asia-Pacific criteria used in Korea: under 18.5 is underweight, 18.5–22.9 is normal, 23–24.9 is overweight (pre-obese), 25–29.9 is obese and 30 or above is severely obese. These are stricter than the WHO global standard, which sets the normal upper limit at 25.
Are the BMR and calorie figures exact?
No. BMR is estimated with the Mifflin-St Jeor equation, and daily calories multiply it by an activity factor. Both are estimates that vary with muscle mass and body composition, so they are a planning aid, not a medical result.