BMI Calcualtor
Your Health, Our Priority
Check your Body Mass Index Free
Quick Result
Get Result in Seconds
Accurate Result
WHO Standard Formula
Health Guidance
Know Your BMI,Live Healthy
Calculate Your BMI
Healthy Range
18.5-24.9
Input Result
Height and Weight
Result
< 30 seconds
WHO Classification
UnderWeight, Normal, OverWeight, Obese
BMI calculator inputs
BMI results
Saved history
No saved BMI results yet.
BMI Table For Adults
This table shows the recommended body weight ranges based on BMI values provided by the World Health Organization(WHO). It applies to both men and women aged 20 years and above and is widely used as a general guide to assess healthy body weight.
| BMI Range(Kg/m2) | Category | What it means |
| Below 18.5 | Underweight | Your weight is below the recommended range for your height |
| 18.5 – 24.9 | Normal Weight | Your weight is considered healthy for your height |
| 25 – 29.9 | Overweight | Your weight is higher than normal |
| 30 – 34.9 | Obese (Class 1) | High body fat level |
| 35 – 39.9 | Obese (Class 2) | Very high body fat level |
| 40 and above | Obese (Class 3) | Extremely high body fat |
Note: BMI should be used as a starting point, not a final judgment. It is best to combine your BMI result with other factors such as diet, physical activity, waist measurement, and medical advice to get a more accurate understanding of your health.
BMI Chart by Height
| Height | Healthy weight (kg) | Healthy weight (lb) |
| 150 cm (4’11”) | 41.6 – 56.0 | 92 – 123 |
| 155 cm (5’1″) | 44.4 – 59.8 | 98 – 132 |
| 160 cm (5’3″) | 47.4 – 63.7 | 104 – 141 |
| 165 cm (5’5″) | 50.4 – 67.8 | 111 – 149 |
| 170 cm (5’7″) | 53.5 – 72.0 | 118 – 159 |
| 175 cm (5’9″) | 56.7 – 76.3 | 125 – 168 |
| 180 cm (5’11”) | 59.9 – 80.7 | 132 – 178 |
| 185 cm (6’1″) | 63.3 – 85.2 | 140 – 188 |
| 190 cm (6’3″) | 66.8 – 89.9 | 147 – 198 |
BMI for Men and Women
The BMI formula and the WHO weight categories are the same for all adults aged 18 and over. A woman and a man with the same height and weight get the same BMI, and the same category. What differs is what that number can mean, because body composition varies between people, and on average between men and women.
BMI Calculator Women
On average, women carry a higher percentage of body fat than men at the same BMI, so a “normal” result does not describe body composition in itself. Fat is stored more around the hips and thighs before menopause, and more around the abdomen afterward. Several life stages affect how you should read your result:
Pregnancy: do not use BMI to judge your weight during pregnancy. Doctors use your pre-pregnancy BMI to guide recommended weight gain.
Menopause: hormonal changes can shift fat toward the waist even when your BMI stays the same, so check your waist size too.
Breastfeeding and postpartum: weight changes gradually, so compare results over months, not days.
BMI Calculator Men
On average, men carry more muscle mass and tend to store fat around the abdomen. This means a muscular man can show a BMI in the overweight range with a low body fat percentage, while a man with a “normal” BMI can still carry a lot of belly fat. Waist size is a useful second check, since the risk starts to rise at about 102 cm (40 in) for men.
Male vs Female BMI Calculator
| Feature | Male | Female |
| Formula | Same BMI formula | Same BMI formula |
| Muscle Mass | Usually higher | Usually lower |
| Body Fat | Lower body fat percentage | Naturally higher body fat percentage |
| Fat Storage | Mostly around the abdomen | Mostly around the hips and thighs |
| Accuracy | May overestimate muscular men | May vary during pregnancy or hormonal changes |
| Purpose | Weight and fitness tracking | Weight and health monitoring |
BMI works the same for men and women, but body composition differences can affect the results.
BMI Calculator for Kids and Teens
Children and teenagers should not use the standard adult BMI formula, because their bodies are still growing and change quickly with age, sex, and puberty. Instead, doctors use BMI-for-age percentile charts, based on CDC growth standards, to compare a child’s BMI with others of the same age and gender. This percentile method, along with the BMI Z-score, gives a much clearer picture of a child’s growth pattern than a single BMI number ever could. If you’re checking a child or teenager’s weight, use our Child & Teen BMI Calculator instead, which is built specifically for ages 2 to 18.
BMI Formula
The BMI formula is a straightforward method for estimating whether your body weight is proportionate to your height. It is calculated by dividing your weight by the square of your height. In the metric system, BMI = mass (kg) ÷ height (m²), while in the imperial system, a conversion factor is used. Adolphe Quetelet introduced this formula, and it is widely used by health organizations to classify weight categories and assess potential health risks.
Metric Units:
BMI = Weight (kg) ÷ height (m²)
US Units:
BMI =Weight (lbs)703 ÷ height (inch²)
Matric: 78 ÷ (1.77 × 1.77) = 78 ÷ 3.13 = 24.9 (Normal weight)
US: BMI = 703 × weight (lb) ÷ height (in)²
Example: 703 × 172 ÷ (69.7 × 69.7) = 120,916 ÷ 4,858 = 24.9 (Normal weight)
BMI Ratio
BMI Prime, also called the BMI ratio, compares your BMI with the highest value of the healthy BMI range. It is calculated by dividing your BMI by 25, which is the upper limit of a healthy BMI according to the World Health Organization (WHO). The result shows how far your body weight is from the ideal range of weight. A BMI Prime of 1.0 means you are at the upper limit of a healthy weight. Values under 1 indicate that you are in the normal or underweight category, and values over 1 mean that you are overweight or obese. BMI Prime is, therefore, a simple and helpful way to know what your weight is and to monitor your progress over time.
The BMI ratio/prime formula is:
BMI Prime = BMI ÷ 25
The table below shows a person’s weight classification based on their BMI prime:
| Classification | BMI Range | BMI Ratio | What It Means |
| Severe Thinness | < 16 | < 0.64 | Very low body weight |
| Moderate Thinness | 16 – 17 | 0.64 – 0.68 | Underweight |
| Mild Thinness | 17 – 18.5 | 0.68 – 0.74 | Slightly underweight |
| Normal | 18.5 – 24.9 | 0.74 – 1.0 | Healthy body weight |
| Overweight | 25 – 29.9 | 1.0 – 1.2 | Higher than normal weight |
| Obese Class I | 30 – 34.9 | 1.2 – 1.4 | High body fat level |
| Obese Class II | 35 – 39.9 | 1.4 – 1.6 | Very high body fat |
| Obese Class III | ≥ 40 | > 1.6 | Extremely high body fat |
Limitations of BMI
- BMI does not directly measure body fat percentage.
- It cannot distinguish between fat and muscle mass.
- Athletes and individuals with a muscular build may have a high BMI but low body fat percentage.
- People with a normal BMI may still have unhealthy body fat levels.
- BMI does not take into account age, gender, or ethnic differences.
- It does not measure body shape or fat distribution in the body.
- Pregnant women may get inaccurate BMI results.
- BMI should not be used as the only method to assess overall health.
- Other factors like diet, fitness, lifestyle, and medical history are also important.
- Doctors usually combine BMI with other health measurements for better evaluation.