Body Mass Index (BMI) Calculator
BMI is a simple indicator of whether your weight is in a healthy range for your height. Enter height and weight to see your BMI, category and healthy weight range.
Your height and weight
Healthy weight
Healthy weight for your height (BMI 18.5–24.9): 53.5 – 72.0 kg
BMI can mislead for under-18s, pregnancy and very muscular people.
How is BMI calculated?
BMI is weight in kilograms divided by height in metres squared. For 70 kg and 1.75 m: 70 ÷ (1.75 × 1.75) = 22.9, in the healthy range.
BMI = weight (kg) ÷ height² (m²)
BMI categories
| BMI (kg/m²) | Category |
|---|---|
| < 18,5 | Underweight |
| 18,5 – 24,9 | Healthy weight |
| 25,0 – 29,9 | Overweight |
| 30,0 – 34,9 | Obesity class I |
| 35,0 – 39,9 | Obesity class II |
| ≥ 40 | Obesity class III |
Healthy weight range by height
| Height | Healthy weight range |
|---|---|
| 150 cm | 41,6 – 56,0 kg |
| 155 cm | 44,4 – 59,8 kg |
| 160 cm | 47,4 – 63,7 kg |
| 165 cm | 50,4 – 67,8 kg |
| 170 cm | 53,5 – 72,0 kg |
| 175 cm | 56,7 – 76,3 kg |
| 180 cm | 59,9 – 80,7 kg |
| 185 cm | 63,3 – 85,2 kg |
| 190 cm | 66,8 – 89,9 kg |
Limitations of BMI
BMI does not distinguish muscle from fat. Muscular athletes may appear overweight, while older adults can have high body fat with a normal BMI. Combine it with waist circumference and body fat. A waist above 88 cm (women) or 102 cm (men) is linked to higher risk.
BMI in children
For ages 2–18 the adult table does not apply; BMI is read against age- and sex-specific percentiles. Use the Child Growth Percentile tool.
Frequently asked questions
What is a normal BMI?
For adults, 18.5 to 24.9 is considered healthy.
Am I overweight with a BMI of 25?
25.0–29.9 is the overweight range, but BMI can mislead if you are very muscular; check waist and body fat too.
Is BMI the same as VKİ?
Yes. VKİ is the Turkish abbreviation for body mass index.
Is BMI different for men and women?
The formula and adult categories are the same; only children use sex-specific percentiles.
Is the ideal BMI different for older adults?
Some studies suggest 23–27 may carry lower risk over 65. Targets for older adults should be set with a doctor.