BMI Calculator

Calculate your Body Mass Index. Metric and imperial supported.

Standard

Height

Weight

BMI Ranges

WHO Technical Report 894, 2000

Category	BMI Range
Underweight	Below 18.5
Normal weight	18.5 – 24.9
Overweight	25 – 29.9
Obese	30 and above

Underweight

Increase nutrient-dense foods — nuts, legumes, whole grains. Strength training builds lean mass.

Overweight / Obese

A 500 kcal/day deficit ≈ 0.5 kg/week loss (NHS). 150 min/week moderate activity (WHO).

How it works

The BMI formula

BMI divides your weight in kilograms by the square of your height in metres.

BMI = kg ÷ m²

Example

70 kg ÷ (1.75)² = 22.9

Understanding results

What BMI cannot measure

–Muscle vs fat mass
–Where fat is stored
–Bone density
–Metabolic health

Full explanation →

Not medical advice. These are reference numbers only. BMI is a screening tool, not a diagnosis. Please consult a qualified doctor or registered nutritionist about your individual health situation.