For adults, a BMI of 18.5–24.9 is generally considered a “normal” or healthy range. Below 18.5 is underweight, 25–29.9 is overweight and 30+ falls into obesity ranges. This calculator also shows a healthy weight range for your height.
BMI Calculator – Fast Body Mass Index (cm/kg & in/lb)
Calculate your BMI instantly and see your healthy weight range. Works with cm/kg or in/lb. Clear category and healthy range. Fast, free, and mobile‑friendly.
Frequently Asked Questions
The BMI formula doesn’t change with age, but body composition does. As we get older, people often lose muscle and gain fat at the same BMI value. That’s why doctors interpret BMI together with age, waist size, blood work and other markers instead of relying on BMI alone.
The safest approach is a combination of a moderate calorie deficit, more movement and strength training. Aim to lose around 0.25–1.0 kg per week. For help with daily calories and structured meals you can combine this BMI result with our calorie deficit calculator and AI meal planner.
The BMI categories (underweight, normal, overweight, obesity) are the same for men and women, but body fat percentage at a given BMI can differ. Women naturally carry more essential fat, so two people with the same BMI can have different body compositions.
BMI is useful for checking if your overall weight is in a typical range for your height, while waist circumference reflects abdominal fat, which is more closely linked to heart and metabolic risk. The best picture comes from tracking both — BMI for general trend, waist and blood tests for health risk.