BMI Calculator
Body Mass Index (BMI)
Calculate Body Mass Index and assess weight health status
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Please enter your height and weight to calculate BMI
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StartAbout BMI
BMI (Body Mass Index) is an indicator used to assess whether weight is healthy. It is calculated by dividing weight (kg) by the square of height (m). Please note that BMI is only a reference indicator and cannot fully reflect an individual's health status.
- BMI does not distinguish fat from muscle; athletes, pregnant women, elderly and children should also consider body fat and other metrics
About this tool
What is BMI Calculator?
Uses the ratio of weight to height to quickly estimate whether you're under- or overweight.
What is it for?
The most common screening metric for healthy weight, telling you at a glance if your weight is in a reasonable range.
How to read your result
(WHO) <18.5 underweight / 18.5–24.9 normal / 25–29.9 overweight / ≥30 obese. BMI doesn't distinguish fat from muscle, so muscular people may score high.
Classification & Reference
| Category | BMI |
|---|---|
| Underweight | <18.5 |
| Normal | 18.5–24.9 |
| Overweight | 25–29.9 |
| Obese | ≥30 |
Formula
BMI = weight(kg) ÷ height(m)²Frequently asked questions
What is a healthy BMI?
By the WHO international classification, a BMI of 18.5–24.9 is the normal, healthy range. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
What BMI counts as overweight or obese?
Overweight is a BMI of 25 to 29.9, and obesity is 30 or higher. Below 18.5 is considered underweight.
Is BMI accurate for muscular people?
Not always. BMI uses only height and weight, so it can't separate fat from muscle. Very muscular people may read as 'overweight' despite low body fat, so pair it with body fat % or waist-to-height ratio.
How do I calculate my BMI?
Divide your weight in kilograms by your height in metres squared: BMI = weight ÷ (height × height). For example, 70 kg at 1.75 m is 70 ÷ 3.06 = 22.9.
What is a healthy BMI for Asians?
For adults of Asian descent, the WHO suggests lower cut-offs because health risks such as type 2 diabetes appear at a lower BMI: overweight starts from about 23 and obesity from about 27.5, so a 'healthy' BMI is roughly 18.5–22.9. moodji applies these lower Asian cut-offs automatically in its Chinese, Japanese and Korean versions.