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BMI Calculator: Body Mass Index and Healthy Weight

Calculate your body mass index and healthy weight range. Learn about WHO BMI categories, the Devine ideal weight formula, and waist measurements.

Vücut Kitle İndeksi (VKİ / BMI) Hesaplama
DSÖ (WHO) Standardı

Boy, kilo, yaş ve cinsiyete göre vücut kitle indeksi, obezite sınıfı ve ideal kilo aralığı

cm
kg
Vücut Kitle İndeksi (BMI)
23.5 kg/m²
Normal Kilo
Sağlıklı Kilo Aralığı
53.5 — 72 kg
WHO 18.5 - 24.9 BMI referansı
Klinik İdeal Kilo
~61.4 kg
Devine formülü klinik referansı
Zayıf (<18.5)Normal (18.5 - 25)Fazla Kilolu (25 - 30)Obez (>30)
23.5
Tebrikler! Vücut ağırlığınız boyunuza göre ideal ve sağlıklı aralıkta.

Dünya Sağlık Örgütü (WHO) VKİ Referans Tablosu

KategoriVKİ / BMI AralığıSağlık Riski Düzeyi
Zayıf0 — 18.49Beslenme yetersizliği riski
Normal Kilo18.5 — 24.99Düşük risk (Sağlıklı)
Fazla Kilolu25 — 29.99Kardiyovasküler & metabolik risk
1. Derece Obez30 — 34.99Kardiyovasküler & metabolik risk
2. Derece Obez35 — 39.99Kardiyovasküler & metabolik risk
3. Derece Morbid Obez40 — 40.0+Kardiyovasküler & metabolik risk

Tıbbi Bilgilendirme: Vücut Kitle İndeksi (VKİ), kas kütlesi ile yağ dokusu arasında ayrım yapmaz. Sporcular, hamileler ve yaşlılar için farklı klinik değerlendirmeler gerekebilir. Buradaki sonuçlar genel bilgilendirme amaçlı olup hekim teşhisi yerine geçmez.

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BMI Calculation Guide: Body Mass Index and Healthy Weight Range

Body mass index (BMI), known internationally as Body Mass Index (BMI); is a basic screening measure used to assess whether body weight is balanced in relation to height. First developed in the 19th century by Belgian mathematician Adolphe Quetelet, this formula is now accepted by the Dünya Sağlık Örgütü (WHO, World Health Organization) as a global reference for monitoring weight distribution in individuals and populations.
HesapYap BMI Calculator; calculates your BMI score from your height and weight in seconds, identifies your WHO category, and lists the healthy weight range for your height.

1. How Is Body Mass Index (BMI) Calculated?

The BMI formula divides body weight by the square of height:

VKI˙=Vu¨cut Ag˘ırlıg˘ı (kg)[Boy (m)]2\text{VKİ} = \frac{\text{Vücut Ağırlığı (kg)}}{[\text{Boy (m)}]^2}



Example Calculation

For an adult who is 1.75 meters, weighing 75 kilograms :
  • Height squared:
    1,75×1,75=3,0625 m21{,}75 \times 1{,}75 = 3{,}0625\text{ m}^2
    
    
  • BMI:
    75÷3,0625≈24,49 kg/m275 \div 3{,}0625 \approx \mathbf{24{,}49\text{ kg/m}^2}
    
    (At the Normal Weight Threshold)

2. World Health Organization (WHO) Adult BMI Table

The internationally accepted weight classification for adults (aged 20 and over) is as follows:
BMI Range (
kg/m2\text{kg/m}^2

)
Category
Health Risk Assessment
< 18.5
Underweight (Low Body Weight)
Risk of weakened immunity, vitamin deficiencies, and osteoporosis
18.5 – 24.9
Normal Weight
Low risk of cardiovascular and metabolic disease
25.0 – 29.9
Overweight
Increased initial risk of type 2 diabetes and hypertension
30.0 – 34.9
Class 1 Obesity
High risk of chronic disease
35.0 – 39.9
Class 2 Obesity
Very high cardiovascular risk

≥\ge

40.0
Class 3 Obesity (Morbid)
A serious clinical condition that threatens quality and length of life

3. How Is the Healthy Weight Range Found?

The theoretical healthy weight range for your height is calculated using the lower (18.5) and upper (24.9) limits of normal BMI:

Sag˘lıklı Alt Kilo Sınırı=18,5×[Boy (m)]2\text{Sağlıklı Alt Kilo Sınırı} = 18{,}5 \times [\text{Boy (m)}]^2


Sag˘lıklı U¨st Kilo Sınırı=24,9×[Boy (m)]2\text{Sağlıklı Üst Kilo Sınırı} = 24{,}9 \times [\text{Boy (m)}]^2


Example: 1.70 m is the height of a person whose healthy weight range is
18,5×2,89≈53,5 kg18{,}5 \times 2{,}89 \approx \mathbf{53{,}5\text{ kg}}

to
24,9×2,89≈72,0 kg24{,}9 \times 2{,}89 \approx \mathbf{72{,}0\text{ kg}}

.

4. What Is the Devine Ideal Weight Formula?

This formula was developed in 1974 by Dr. Ben Devine to adjust certain medication doses according to body weight in clinical pharmacology. It provides a single reference point based on height and biological sex:
  • For men:
    50 kg+[2,3×(I˙nc¸ Cinsinden Boy−60)]50\text{ kg} + [2{,}3 \times (\text{İnç Cinsinden Boy} - 60)]
    
    
  • For women:
    45,5 kg+[2,3×(I˙nc¸ Cinsinden Boy−60)]45{,}5\text{ kg} + [2{,}3 \times (\text{İnç Cinsinden Boy} - 60)]
    
    
(1 inch = 2.54 cm; 60 inches = 152.4 cm).
Clinical Note: The Devine result is not a single, absolute "aesthetic ideal weight" target for everyone; it is an additional reference value in clinical screening.

5. The Limits of BMI: Why Is It Insufficient on Its Own?

Although BMI is a practical population screening tool, it cannot distinguish body composition (the proportions of fat, muscle, bone, and water) . It can therefore give misleading results in the following groups:
  1. Athletes and Bodybuilders: Muscle tissue is denser than fat. An athlete with substantial muscle mass and low body fat may have a BMI of 25-29.9 (overweight) or even 30 and above (obese); however, because body fat is low, this value may not carry the same metabolic risk as it does for a person with more body fat at the same BMI.
  1. Older Adults: Muscle loss (sarcopenia) occurs with age. An older person whose weight and BMI appear normal may have dangerously low muscle mass and high levels of fat around the internal organs.
  1. Pregnant and Postpartum Women: Fetal growth and fluid retention make the standard BMI formula invalid.
  1. Waist Circumference Factor (Visceral Fat): Fat accumulating around the hips or legs does not have the same biological effect as fat around the abdominal organs. According to WHO guidelines, when waist circumference exceeds 102 cm in men, 88 cm in women , the risk of cardiovascular disease rises significantly (even if BMI is normal).

6. Why Is BMI Different in Children and Adolescents?

The fixed adult range of 18.5 - 24.9 cannot be applied to children and young people aged 2 to 19. During growth, body proportions change rapidly with age and sex.
Children are assessed using Sağlık Bakanlığı (Ministry of Health) and CDC growth curves and BMI Percentile tables:
  • Below the 5th percentile: Underweight
  • Between the 5th and 85th percentiles: Normal and healthy weight
  • Between the 85th and 95th percentiles: Overweight
  • 95th percentile and above: Risk of obesity

Frequently Asked Questions

My BMI is 26. Should I go on a diet? The 25-29.9 range is classified as overweight. However, rather than starting a strict diet immediately, you should review your waist circumference, blood tests (blood sugar, cholesterol), and physical activity level with a doctor or nutrition professional.
What time of day is best for weighing yourself? The most accurate way to track weight is 1 time a week on the same scale, in the morning before eating, after using the toilet, and without clothing or in light clothing.
What measures besides BMI can I use to monitor metabolic health? Waist-to-height ratio (a waist circumference less than half your height is recommended), blood pressure, fasting blood sugar, and lipid profile are much more comprehensive measures for monitoring overall health.

Sources and Standards

Medical Notice: This content and calculator are intended for general awareness and information; they do not replace a personal medical diagnosis, treatment, or prescribed diet. Consult your doctor or a qualified dietitian for weight management and chronic health assessments.