BMI Calculator - Body Mass Index

  • Centimeters (cm)
  • Feet & Inches
  • 18 - 64 (Adult)
  • 65+ (Senior)
Results
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The Body Mass Index (BMI) is a simple, widely-used tool to estimate whether a person has a healthy body weight for their height. It's calculated by dividing your weight in kilograms by the square of your height in meters. Our BMI Calculator not only computes your BMI but also tells you the standard weight range for your height — so you know exactly how much you should ideally weigh.

To use the calculator, enter your height (in centimeters or feet & inches) and your weight in kilograms or pounds. Select your age group and the calculator instantly shows: your BMI value, the corresponding weight category, your ideal weight range, and exactly how much weight to gain or lose to reach your target.

BMI is valuable as a quick screening tool, but it has limitations. It doesn't distinguish between muscle, fat, and bone mass — a lean athlete or bodybuilder may fall into the "overweight" category despite being perfectly healthy. Factors like age, sex, body composition, and ethnic background also influence interpretation. Use BMI alongside waist circumference and body fat percentage for a more complete picture.

World Health Organization (WHO) BMI categories provide a global standard: underweight (below 18.5), normal weight (18.5 to 24.9), overweight (25 to 29.9), and obese (30 and above). Our calculator breaks obesity into three subcategories for more precise guidance.

Képlet
BMI = Weight (kg) ÷ Height (m)²

Gyakran Ismételt Kérdések

What is a normal BMI range?
According to the WHO: Underweight (BMI < 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese Class I (30-34.9), Obese Class II (35-39.9), Obese Class III (≥ 40).
What should my ideal weight be for my height?
Your standard weight range is determined by the BMI 18.5-24.9 brackets. For example, if you are 170cm tall, your ideal weight is approximately 53.5-72.0 kg (118-159 lbs). Our calculator shows this range directly.
Is BMI accurate for athletes and bodybuilders?
BMI doesn't account for muscle mass — a bodybuilder may have a BMI of 28 (overweight) yet have very low body fat. For athletes, consider adding waist measurement, body fat percentage, or use a body composition analyzer.
Is there an ideal weight for seniors?
For adults 65+, a slightly higher BMI (22-27) may be healthier. Underweight seniors face higher risks of frailty and complications. However, individual factors like muscle mass and body fat matter more than BMI alone.

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