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BMI calculator — body mass index

Enter your height and weight to instantly get your body mass index (BMI), which category you fall into, and a healthy weight range for your height. Free, no account.

Underweight< 18.5
Normal weight18.5 – 24.9
Overweight25 – 29.9
Obesity≥ 30
Your BMI
24.5kg/m²

Category: Normal weight

Healthy weight range for your height
5776 kg
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BMI is a rough guide and doesn't tell muscle from fat — not medical advice.

What is BMI?

Body mass index (BMI) is a ratio of weight to height that gives a rough estimate of whether your weight is in a healthy range. It's worked out with a simple formula:

BMI = weight(kg) ÷ height(m)²

BMI categories (adults)

Underweightbelow 18.5
Normal weight18.5 – 24.9
Overweight25 – 29.9
Obesity30 and above

BMI limitations

BMI only looks at weight and height — it doesn't tell muscle from fat. A muscular person can have a “high” BMI with little fat, while an inactive person with a normal BMI may carry too much fat. So use BMI as a guide, and for your real goal look at calories and macros, body composition and your waist.

Frequently asked questions

How is BMI calculated?

BMI = body weight (kg) divided by height in metres squared (m²). For example, 75 kg and 1.75 m gives 75 / (1.75 × 1.75) = 24.5.

What is a normal BMI?

A range of 18.5–24.9 is considered a normal (healthy) body weight for adults.

What do the BMI categories mean?

Below 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30 or above is obesity.

Is BMI accurate for everyone?

It isn't perfect: it doesn't tell muscle from fat, so it can overestimate for muscular people and underestimate for inactive ones. Use it as a rough guide.

BMI or body-fat percentage?

For body composition, body-fat percentage is more precise. BMI is a quick guide; for your real goal also look at your waist, photos and measurements.

What's a healthy weight for my height?

The weight that gives a BMI of 18.5–24.9. The calculator above shows you the exact range in kilograms for your height.

Go beyond BMI

MicroPlan turns your measurements into a real meal and training plan and tracks your progress — free, no account.

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