BMI Calculator
Body mass index with category and healthy weight range.
BMI is a screening tool, not a diagnosis. It cannot distinguish muscle from fat, and it is not valid for children, pregnant people, or athletes.
Your BMI
22.9
Normal weight
BMI categories (WHO)
| Category | BMI range | Weight at your height |
|---|---|---|
| Underweight | Below 18.5 | Under 57 kg |
| Normal weightYou | 18.5 – 24.9 | 57 kg – 76 kg |
| Overweight | 25.0 – 29.9 | 77 kg – 92 kg |
| Obese | 30.0 and above | Over 92 kg |
How the BMI Calculator works
Body mass index compares your weight to your height as a quick population-level screening number. It is useful as a starting point, but it cannot tell muscle from fat, which is why an athlete and a sedentary person can share a BMI and very different health profiles.
Not medical advice. This calculator gives a general estimate, not medical advice. It cannot account for your individual health, medical history, or medication. Talk to a qualified healthcare professional before acting on any result.
Frequently asked questions
How is BMI calculated?
BMI = weight in kilograms ÷ (height in metres)². In imperial units, BMI = 703 × weight in pounds ÷ (height in inches)². A 70 kg person who is 1.75 m tall has a BMI of 70 ÷ 3.06 = 22.9.
What is a healthy BMI range?
The WHO classifies BMI under 18.5 as underweight, 18.5-24.9 as normal weight, 25-29.9 as overweight, and 30 or above as obese. For people of South and East Asian descent, health risk rises earlier, and many guidelines shift the overweight threshold down to 23.
Is BMI accurate for everyone?
No. It overestimates body fat in muscular people and underestimates it in older adults who have lost muscle. It is also not valid for children, pregnant people, or anyone under about 18 without age-and-sex-specific percentile charts.
What should I use instead of BMI?
Waist circumference and waist-to-height ratio track health risk better because they capture abdominal fat specifically. A simple rule of thumb: keep your waist under half your height.