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BMI Calculator

Enter your height and weight to calculate your Body Mass Index. See your BMI category, a visual scale, and the healthy weight range for your height.

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cm
Your BMI
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How to Use the BMI Calculator

1
Choose your units. Select metric (kg and cm) or imperial (lbs and feet/inches) using the toggle at the top.
2
Enter your weight and height. Type in your measurements and your BMI appears instantly with a category label.
3
Read your results. The scale bar shows where your BMI falls. The healthy weight range shows what you would need to weigh to be in the normal range.

BMI Formula

Metric:

BMI = weight (kg) / height (m)^2

Imperial:

BMI = (weight (lbs) / height (in)^2) x 703

BMI is a screening tool, not a diagnostic test. Factors like muscle mass, bone density, age, and ethnicity can affect its accuracy.

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Frequently Asked Questions

What is a healthy BMI?

For most adults using WHO standard: underweight is below 18.5, healthy is 18.5-24.9, overweight is 25-29.9, and obese is 30 or above. For Asian adults, Singapore MOH recommends overweight starts at BMI 23.

How is BMI calculated?

Metric: BMI = weight in kg divided by height in meters squared. For a person who is 70 kg and 1.75 m tall: 70 / (1.75 x 1.75) = 22.9. Imperial: BMI = (weight in lbs / height in inches squared) x 703.

Is BMI accurate?

BMI is a useful starting point but has real limitations. It does not measure body fat directly, so a very muscular person may have a "overweight" BMI while having low body fat. It also does not account for where fat is stored, which matters for health risk. Use BMI as one of several indicators, not the only one.

What BMI is overweight?

WHO standard: overweight is BMI 25-29.9, and obese is 30 or above. For Asian adults, the WHO Asia-Pacific guidelines set overweight at BMI 23-27.4, and obese at 27.5 or above. For Asian-specific results, visit HealthCalcAsia.com.

What is BMI for Asian adults?

For Asian adults, health organisations in Singapore, China, and Japan use lower cut-offs: healthy BMI is 18.5-22.9, overweight is 23-27.4, and obese is 27.5 or above. This is because Asians tend to carry more body fat at the same BMI compared to people of other ethnicities, leading to higher health risks at lower BMI values.