BMI Calculator — Check Your Body Mass Index
BMI is the quickest way to see whether your weight sits in a healthy range for your height. Enter your height and weight to get your score, category and healthy range instantly.
The result updates instantly as you change the numbers.
27.8
What the numbers mean
Under 18.5 is underweight, 18.5-24.9 healthy, 25-29.9 overweight and 30+ obese. These WHO cut-offs are a general screening tool for adults.
When BMI misleads
BMI divides weight by height squared, so it can't tell muscle from fat. A lifter can read 'overweight' at 10% body fat, while a sedentary person can read 'normal' with high fat. Pair it with body fat percentage and waist measurement.
Your next step
If you're above 25 and want to lean out, start from your daily calories, run a 400-500 kcal deficit, keep protein high and lift three times a week. Use the calorie calculator to get your starting number.
FAQ
How do I calculate BMI manually?▼
Divide weight in kg by height in metres squared. 80 kg at 1.75 m: 80 ÷ (1.75 × 1.75) = 26.1.
What's a normal weight for my height?▼
A healthy weight keeps BMI between 18.5 and 24.9 — the calculator shows that range in kilos for your exact height.
Does BMI work for kids or pregnancy?▼
No. Children use age-based growth charts and pregnancy changes weight naturally; BMI applies to non-pregnant adults.