BMI Calculator

Whether you want to lose weight, live a healthier lifestyle or build muscle – the Body Mass Index (BMI) is usually the first thing you calculate. Based on your BMI you can put together a training and nutrition program. But what exactly is your BMI? And how do you calculate it? We are happy to tell you everything you need to know about your BMI.

BMI is an index that assesses your body weight in relation to your height. The results distinguish the following categories: underweight, healthy weight, overweight and serious overweight.


Who can calculate BMI? It’s very easy. The calculation is based on the following Body Mass Index formula:

BMI = Body weight [kg] / (body height [m]) ²

Example: A woman weighs 60 kg and is 1.69 m tall.

Calculation: (60 kg) / (1.69 m) ² ≈ 21

This woman has a BMI of 21.

Have your personal BMI calculated in our free Body Check.

BMI Calculator

Do you want to know how high your BMI is? Then have it calculated online now. Very easy – without a calculator. And for free of course.

BMI Calculator

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Your BMI is......

less than 18.5:Underweight
18.5 - 24.9:Normal weight
25 - 29.9:Overweight
30 - 34.9:Class I Obese
35 - 39.9:Class II Obese
40 upwards:Class III Obese



Once you have calculated your Body Mass Index, you can see the status of your weight in the table. According to the World Health Organization (WHO), all values ​​between 18.5 and 24.99 are healthy.

Category BMI (kg / m²) Body weight
Seriously underweight <16.0 Underweight
Moderately underweight 16.0-17.0 Underweight
Slightly underweight 17.0-18.5 Underweight
Healthy weight 18.5 – 24.9 Healthy weight
Pre-obesity 25.0 – 29.9 Overweight
Obesity class I. 30.0 – 34.9 Obesity
Class II obesity 35.0 – 39.9 Obesity
Obesity class III ≥ 40 Obesity

Based on your BMI you can now also calculate your basal metabolism and energy expenditure. Your basal metabolic rate shows the energy your body consumes in complete resting state. The extra energy you need for physical activities is called energy expenditure. Already calculated? Then put together your personal training and nutrition program.

To achieve optimal results from your training, protein shakes such as a Whey Protein Shake are the perfect food after a strength training. They stimulate your muscle building and fat burning.


Because the weight between women and men is quite different, it is best to take a look at our table with average BMI values ​​for women or men. In addition, age also plays an important role. Here is an overview:


The following table shows the ideal weight according to age for women.

Age Healthy weight / Ideal BMI
16-17 19-24
18 19-24
19-24 19-24
25-34 20-25
35-44 21-26
45-54 22-27
55-64 23-28
65-90 25-30

Here you will find the table that shows the ideal weight according to age for men.

Age Healthy weight / Ideal BMI
16 19-24
17 20-25
18 20-25
19-24 21-26
25-34 22-27
35-54 23-28
55-64 24-29
65-90 25-30

5. Advantages and disadvantages of BMI

BMI is the most commonly used calculation to assess your body weight. It is a fixed calculation and provides a quick estimate of your body weight. But you may have noticed that not all factors are included. Consider important factors such as posture, gender and the ratio between fat and muscle mass.

What exactly does that mean? Especially if you exercise a lot and therefore grow a lot of muscle, the result cannot be right. That’s because you gain muscle mass, not fat mass. And, muscle is heavier than fat. In this case, your BMI is automatically higher. So it is important to keep these factors in mind when calculating your BMI result.

6. Our conclusion

If you want to know quickly how your weight is doing, your BMI offers a good solution. Still, you shouldn’t take the results too seriously and, when in doubt, talk to your doctor. The big disadvantage of BMI is that it makes no difference between muscle and fat mass.