Ideal weight (Devine)
Calculate reference body weight from sex and height using the clinical Devine formula.
Open calculatorBMI
BMI is body weight in kilograms divided by height in metres squared. The adult categories follow World Health Organization (WHO) cut-offs. Note that BMI does not distinguish body fat from muscle mass.
Body mass in kilograms — enter your current weight without shoes or heavy clothing.
kg
Height in centimetres — the calculator automatically converts it to metres for the BMI formula.
cm
BMI
24.2Healthy weight
Healthy weight for this height
53.5–72.0 kg
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Frequently asked questions
How is BMI calculated?
BMI is body weight in kilograms divided by height in metres squared: weight (kg) ÷ [height (m)]². At 70 kg and 170 cm (1.70 m), BMI = 70 ÷ (1.70 × 1.70) ≈ 24.2.
What are the WHO adult BMI categories?
Below 18.5 is underweight, 18.5–24.9 is healthy weight, 25.0–29.9 is overweight, 30.0–34.9 is obesity class I, 35.0–39.9 is obesity class II, and 40.0 or higher is obesity class III.
Does BMI distinguish body fat from muscle mass?
No. Strength athletes often have a BMI above 25 despite low body fat, while a normal BMI can still mask elevated visceral fat. Pair BMI with the Body Fat (US Navy), Waist-to-Hip (WHR) or FFMI calculator for a clearer picture.
How is the healthy weight range for my height calculated?
The calculator multiplies your height in metres squared by 18.5 (lower bound) and 24.9 (upper bound) to show the WHO normal-weight span in kilograms.
Is a BMI result a medical diagnosis?
No. BMI is a general population screening index and does not replace a clinical evaluation by a doctor or registered dietitian.
Educational estimate only. Not medical, tax, legal or financial advice.