Looking to improve your fitness and live a healthy lifestyle? Our BMI calculator is here to help you determine your body mass index (BMI) and track your progress towards your fitness goals. Whether you want to lose weight, gain muscle, or simply maintain a healthy weight, our tool can provide valuable insights. Simply enter your weight and height, and discover your BMI in just a few seconds.

BMI Calculator

BMI Calculator

What is BMI

Body mass index, or BMI, is a measure of body fat based on height and weight. It is used as an indicator of overall health and is commonly used to determine whether an individual is at a healthy weight for their height.

Keep in mind that BMI is not a direct measure of body fat and may not be accurate for all individuals. Factors such as muscle mass, bone density, and distribution of fat can affect BMI and should be taken into consideration when interpreting the results.

How Do I Calculate My BMI

BMI is calculated by dividing your weight in kilograms by the square of your height in meters.

To calculate your BMI manually, you need to know your weight and height. First, you’ll need to convert your weight to kilograms if it’s in pounds, and your height to meters if it’s in feet and inches.

For a great selection of smart scales that can help you keep track of your weight and other important health metrics, check out our article on the best smart scales.

Once you have your weight in kilograms and your height in meters, you’re ready to calculate your BMI.

To do this, you’ll need to divide your weight by the square of your height.

Here’s the formula: BMI = weight (kg) / height (m)^2.

For example, let’s say you weigh 75 kilograms and are 1.75 meters tall. To calculate your BMI, you’d divide 75 by 1.75^2, which comes out to 24.49.

Alternatively, you can use the online BMI Calculator above for convenience.

Interpreting Your BMI Results

Now that you’ve calculated your BMI, you might be wondering what your results mean and how to interpret them.

BMI RangeInterpretation
Less than 18.5Underweight
18.5 – 24.9Normal weight
25 – 29.9Overweight
30 or greaterObesity

Generally speaking, a BMI between 18.5 and 24.9 is considered to be within a healthy range, while a BMI below 18.5 is considered underweight and a BMI above 25 is considered overweight. However, it’s important to note that these guidelines may not apply to everyone, and there are several factors that can affect your BMI.

For example, if you have a lot of muscle mass, your BMI may be higher than what is considered healthy, even if you have a low body fat percentage. On the other hand, if you have a low muscle mass or a high body fat percentage, your BMI may be lower than what is considered healthy, even if you weigh the same as someone with a higher muscle mass or lower body fat percentage.

So, how can you use your BMI to track your health and fitness goals? One way is to use it as a general guideline to help you determine whether you’re at a healthy weight for your height.

If your BMI is within the healthy range, you may be able to maintain your current weight and focus on other aspects of your health, such as exercising and eating a balanced diet.

If your BMI is below the healthy range, you may want to consider gaining weight to reach a healthier weight.

If your BMI is above the healthy range, you may want to consider losing weight to reduce your risk of developing chronic diseases and improve your overall health.

It’s important to remember that BMI is just one tool that can be used to assess your health, and it should not be used as a sole indicator of your overall health.

Other factors, such as body composition, diet, and physical activity level, can all impact your health and should be taken into consideration when assessing your health and setting fitness goals.

What is a Normal BMI

A normal BMI for adults is generally considered to be between 18.5 and 24.9.

Benefits of a Normal BMI

Maintaining a normal BMI can have a number of benefits for your overall health and well-being. Some of the benefits of having a normal BMI include:

  • Enhance your overall health and fitness: Studies have shown that maintaining a normal BMI can help you improve your overall health and fitness, and may even reduce your risk of certain health conditions
  • Better mental health: Maintaining a healthy weight has been linked to improved mental health, including a lower risk of depression and anxiety.
  • Increased energy levels: Being at a healthy weight can help you feel more energized and able to participate in activities you enjoy.
  • Improved sleep: Studies have shown that people with a normal BMI are more likely to get a good night’s sleep, which can help improve their overall health and well-being.
  • Increased self-esteem: Feeling good about your weight and body can boost your self-esteem and confidence.

What is the Correct BMI for My Age?

BMI is not directly related to age, but rather to weight and height. It is a measure of body fat based on the ratio of weight to height, and is used as an indicator of health risk.

Limitations of BMI

While BMI can be a useful tool for assessing your weight and risk of chronic diseases, it has some limitations that you should be aware of. Some of the limitations of BMI include:

  • BMI doesn’t take into account differences in muscle mass: BMI doesn’t take into account the amount of muscle mass you have, which means that people with a lot of muscle mass may have a higher BMI even if they have a low body fat percentage. This can make it difficult to interpret your BMI if you have a lot of muscle mass.
  • BMI doesn’t distinguish between fat and muscle: Because BMI is based on weight and height, it doesn’t take into account the difference between fat and muscle. This means that people who have a lot of muscle mass may be classified as overweight or obese based on their BMI, even if they have a low body fat percentage.
  • BMI may not be accurate for older adults: As we age, our bodies naturally change, and our muscle mass tends to decrease while our fat mass tends to increase. This can affect our BMI, making it less accurate for older adults.
  • BMI doesn’t take into account other factors that affect health: BMI doesn’t take into account other factors that can affect your health, such as your diet, physical activity level, and stress levels. These factors can all impact your risk of developing chronic diseases and should be considered when assessing your health.

Despite these limitations, BMI can still be a useful tool for assessing your weight and risk of chronic diseases. It’s important to use it in conjunction with other tools, such as body composition measurements, and to consider other factors that can impact your health when assessing your overall well-being.

Other Measurement Methods

While BMI is a widely used method for assessing weight and risk of chronic diseases, it’s not the only method available. Some other measurement methods you may want to consider include:

  • Body fat percentage: Knowing your body fat percentage can give you a more accurate understanding of your weight and overall health. There are different ways to measure body fat, such as skinfold thickness measurements, bioelectrical impedance, and DXA (dual energy x-ray absorptiometry). If you want a convenient and accurate way to track your body fat percentage at home, consider using the Withings Body Cardio Body Composition Scale.
  • Waist circumference: Measuring your waist circumference can give you an idea of your risk of developing chronic diseases, as a higher waist circumference has been linked to an increased risk of heart disease, diabetes, and other conditions.
  • Body composition measurements: Body composition measurements can help you understand the makeup of your body in terms of fat, muscle, and other tissues. There are several methods for measuring body composition, including DXA, hydrostatic weighing, and air displacement plethysmography.

Tips for Maintaining a Healthy Weight

Maintaining a healthy weight is important for both your physical and mental well-being. Here are some tips for maintaining a healthy weight through fitness:

  • Find an activity you enjoy: The best exercise is the one that you enjoy, so try out different activities until you find something that you love. This could be anything from running to yoga to dancing.
  • Set realistic goals: Don’t try to do too much too soon. Start with small goals and build up gradually. This will help you stay motivated and make it more likely that you’ll stick with your fitness routine.
  • Make it a habit: Exercise is most effective when it’s a regular part of your routine. Try to incorporate physical activity into your daily routine by walking more, taking the stairs instead of the elevator, or going for a bike ride after dinner.
  • Mix it up: Doing the same activity every day can get boring, so try to mix things up. This could be as simple as switching up your route when you go for a run or trying a new class at the gym.
  • Get support: It can be easier to stay motivated and on track if you have someone to support you. Consider joining a fitness group or finding a workout buddy. If you exercise at home at your own home gym, try to exercise with your partner or family member to help keep you motivated.


BMI is a widely used method for assessing weight and risk of chronic diseases. It’s important to interpret your BMI results in the context of other factors, such as your age, gender, and muscle mass. Maintaining a healthy weight can have numerous benefits, including reducing your risk of chronic diseases and improving your overall quality of life.

Remember that no single measurement method is perfect, and it’s often best to use a combination of methods to get a comprehensive understanding of your weight and overall health. By following these tips and finding activities that you enjoy, you can maintain a healthy weight and improve your overall fitness level.


Kline CE, Chasens ER, Bizhanova Z, Sereika SM, Buysse DJ, Imes CC, Kariuki JK, Mendez DD, Cajita MI, Rathbun SL, Burke LE. The association between sleep health and weight change during a 12-month behavioral weight loss intervention. Int J Obes (Lond). 2021 Mar;45(3):639-649. doi: 10.1038/s41366-020-00728-8. Epub 2021 Jan 7. PMID: 33414489; PMCID: PMC7914147.

Please note: This BMI calculator is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you are concerned about your health or have any medical conditions, please consult a healthcare professional. The results of this calculator should not be used to diagnose or treat any medical conditions. We are not responsible for any errors or omissions in the calculation of BMI or any consequences arising from its use.