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BMI Calculator

Calculate your Body Mass Index in seconds and see the healthy weight range for your height. Works with metric and imperial units.

BMI is a screening tool for adults aged 20+. It doesn't measure body fat directly and may be less accurate for athletes, older adults, and during pregnancy.

Your BMI
24.2
Category
Healthy weight

A healthy weight for your height is 53.5 kg to 72.0 kg (BMI 18.5–24.9).

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BMI categories for adults

BMICategory
Below 18.5Underweight
18.5 – 24.9Healthy weight
25 – 29.9Overweight
30 and aboveObesity

The BMI formula

Metric: BMI = weight (kg) ÷ height (m)². For example, 70 kg at 1.75 m gives 70 ÷ 3.06 = 22.9.

Imperial:BMI = 703 × weight (lb) ÷ height (in)². For example, 154 lb at 5'9" (69 in) gives 703 × 154 ÷ 4,761 = 22.7.

What to do with your result

If your BMI is above the healthy range, a moderate calorie deficit is the most reliable way to bring it down. Use our calorie calculator to find your daily target, then track your meals so you actually hit it. If your BMI is below 18.5, a small calorie surplus with enough protein helps you gain healthy weight.

BMI is not suitable for children, pregnant women or very muscular people. Talk to a healthcare professional about your individual health.

Frequently asked questions

What is a healthy BMI?

For adults, a BMI between 18.5 and 24.9 is classed as a healthy weight by the World Health Organization. Below 18.5 is underweight, 25–29.9 is overweight and 30 or above is obesity.

How is BMI calculated?

BMI is your weight in kilograms divided by your height in metres squared (kg/m²). In imperial units it is 703 × weight (lb) ÷ height (in)².

Is BMI accurate?

BMI is a quick screening tool, not a diagnosis. It doesn't distinguish muscle from fat, so very muscular people may be classed as overweight. Waist measurement and body-fat percentage give extra context.

Are BMI ranges different for Asian adults?

Some health bodies use lower cut-offs for people of South Asian, Chinese and other Asian backgrounds, because health risks start at a lower BMI — often 23 for overweight and 27.5 for obesity.

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