BMI Calculator Saudi Arabia
Whether you are starting a new fitness journey, tracking your weight loss, or just checking in on your general health, knowing your Body Mass Index (BMI) is the perfect starting point.
Our free online BMI calculator instantly evaluates your body weight relative to your height. We also calculate your exact Healthy Weight Range, giving you a clear, science-backed target to aim for based on the World Health Organization’s global guidelines.
BMI Calculator
Check your Body Mass Index & ideal weight range
How to Use Our BMI Calculator
Our calculator removes the complicated math and delivers instant insights.
Choose Your System: Toggle between Standard US units (feet/inches and pounds) or Metric units (centimeters and kilograms) depending on what you are comfortable with.
Enter Your Stats: Input your gender, age, current height, and current weight.
Calculate: Click the button to instantly see your BMI score, your official health category, and the exact weight bracket you should aim for to be considered “Normal Weight.”
How is BMI Calculated? (The Formula)
If you prefer to do the math yourself, Body Mass Index is calculated by dividing a person’s weight by the square of their height. The formula changes slightly depending on whether you use the Metric or US Standard system.
For the Metric System:
For the US Standard System:
Because the standard formula was designed for kilograms and meters, calculating it in pounds and inches requires a conversion factor of 703.
The Standard BMI Categories
Once you have your BMI number, it is categorized into one of four main groups defined by the World Health Organization (WHO) for adults over the age of 20:
Underweight: BMI is less than 18.5
Normal Weight: BMI is 18.5 to 24.9
Overweight: BMI is 25 to 29.9
Obese: BMI is 30 or higher
Note: Individuals in the “Obese” category are often further broken down into Class I (30-34.9), Class II (35-39.9), and Class III / Severe Obesity (40+).
10 Frequently Asked Questions (FAQs)
1. What is a healthy BMI for my age?
For adults over the age of 20, age is actually not a factor in the standard BMI formula. Whether you are 25 or 65, the healthy target range remains the same: a BMI between 18.5 and 24.9.
2. Is BMI a perfectly accurate measure of health?
No. BMI is a great screening tool for broad populations, but it is a flawed diagnostic tool for individuals. Because it only measures height and weight, it cannot distinguish between fat, muscle, and bone mass. You should view your BMI as a starting point, not a definitive health diagnosis.
3. Why do professional athletes have a high BMI?
Because muscle is significantly denser than fat. A professional bodybuilder or football player may weigh 240 lbs at 6 feet tall, putting them in the “Obese” BMI category. However, their actual body fat percentage might be extremely low.
4. What is the difference between BMI and Body Fat Percentage?
BMI is simply a mathematical ratio of your height to your weight. Body fat percentage is a physical measurement of exactly how much of your total body weight is composed of adipose tissue (fat). Body fat percentage is a much more accurate indicator of metabolic health than BMI.
5. Does gender affect my BMI?
The mathematical formula for BMI is identical for men and women. However, women naturally carry higher percentages of essential body fat than men. Because of this, a man and a woman with the exact same BMI will generally have different body compositions.
6. At what BMI is someone considered underweight?
A BMI below 18.5 is officially classified as underweight. Being underweight can carry its own severe health risks, including a weakened immune system, nutritional deficiencies, osteoporosis, and anemia.
7. What is considered a dangerously high BMI?
A BMI over 30 is classified as obese, which elevates the risk of heart disease and type 2 diabetes. A BMI of 40 or higher is classified as “Class III” or “Severe” obesity, which carries a dramatically increased risk of life-threatening metabolic and cardiovascular conditions.
8. Does BMI apply to children and teens?
The formula is the same, but the interpretation is completely different. Because children are constantly growing, their BMI must be compared against other children of the exact same age and sex using a “BMI-for-age percentile” chart provided by pediatricians.
9. Can I use BMI if I am pregnant?
No. BMI calculators should not be used by pregnant women. The natural and necessary weight gain associated with supporting a growing baby will result in a heavily skewed and inaccurate BMI reading.
10. How can I lower my BMI safely?
The safest way to lower your BMI is through a sustainable combination of a slight caloric deficit, a protein-rich diet, and regular physical activity (both cardiovascular exercise and strength training). Always consult a healthcare provider or a registered dietitian before making drastic changes to your diet or exercise routine.