Free BMI Calculator by Healthy Office Habits
Weight Loss,  Physical Well-Being

BMI Calculator – Calculate your Body Mass Index

BMI Calculator


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

Are you curious about your body’s health and want to know if you are at a healthy weight for your height?

Look no further than our free Body Mass Index – BMI calculator!

With just a few simple inputs, our calculator will not only give you your BMI value but also categorize it based on information provided by trusted health organizations like WHO and CDC.

And the best part?

It’s free! Discover your BMI today and take the first step towards a healthier, happier you.

What are Body Mass Index (BMI) and BMI Calculator?

Your body is an amazing machine that deserves to be taken care of, and that includes maintaining a healthy weight. Body Mass Index (BMI) can be a helpful tool to help you understand if you are at a healthy weight for your height.

You can easily evaluate your body mass index (BMI) to identify if your current weight is healthy for your current height in a scientific manner using BMI Calculator.

How is Body Mass Index (BMI) Calculated?

It is calculated by using your weight and your height.

Because it considers both your weight and height to assess if you are at a healthy weight for your body size, BMI is a useful tool.

Doctors and other healthcare experts typically rely on BMI to determine a patient’s risk for health issues linked to being overweight or underweight.

You must have your weight in kilograms (kg) and height in meters to determine your BMI. (m).

Then you divide your weight by your height squared. This gives you your BMI number.

To determine your BMI, you may also utilize charts or online BMI calculators.

Using a chart, you may determine your BMI and whether you are underweight, normal weight, overweight, or obese.

It’s important to bear in mind that BMI calculation is not always an accurate indication of health, therefore it’s recommended to consult a doctor or other healthcare provider if you have any queries or worries about your weight or general well-being.

In general terms, a BMI of less than 18.5 is classified as underweight, a BMI of 18.5 to 24.9 as normal weight, a BMI of 25 to 29.9 as overweight, and a BMI of 30 or more as obese.

Remember, your weight and height are unique to you, and what might be a healthy weight for someone else might not be the same for you.
That’s why calculating your BMI can be so helpful. BMI Calculator takes into account your body size and can help you determine if you are at risk for health problems.

Example 1: Calculating BMI With Kilograms for a Woman

If a woman weighs 65 kilograms and is 1.62 meters tall, you would calculate the BMI as follows:

Start by calculating the meters squared. Using this example, it would be 1.62 x 1.62 = 2.62 m2. Next, divide the weight in kilograms by the meters squared result. Using this example, it would be 65 ÷ 2.62 = 24.81 BMI. The BMI for this woman is 24.81.

Example 2: Calculating BMI With Kilograms for a Man

If a man weighs 90 kilograms and is 1.82 meters tall, you would calculate the BMI as follows:

Start by calculating the meters squared. Using this example, it would be 1.82 x 1.82 = 3.31 m2. Next, divide the weight in kilograms by the meters squared result. Using this example, it would be 90 ÷ 3.31 = 27.22 BMI. The BMI for this man is 27.22.

Example 3: Calculating BMI With Pounds

If a person weighs 175 pounds and is 67 inches tall, you would calculate the BMI as follows:

Start by calculating the inches squared.

Using this example, it would be 67 x 67 = 4,489 in2.

Next, divide the weight in pounds by the inches squared result.

Using this example, it would be 175 ÷ 4,489 = 0.03898. Finally, multiply that result by 703. Using this example, it would be 0.03898 x 703 = 27.41 BMI.”

What is a Good BMI for my Age?

Research suggests that the optimal BMI range varies by age and gender.

For older adults, a BMI of 31-32 for females and 27-28 for males is associated with better functional capacity and reduced risk of health issues (Kıskaç, 2022).

In middle-aged women, a BMI of 19-24 is linked to better mental health and lower prevalence of tiredness (Brown, 1998).

For women in their seventies, a BMI of 22-24 is associated with lower risk of hospital admission and mortality (Uffelen, 2010).

In children, a higher BMI in adolescence is predictive of overweight in adulthood (Guo, 1999).

How BMI Affects Your Health

BMI is a measurement based on a person’s height and weight, and it plays a significant role in determining one’s health.

Maintaining a healthy BMI is linked to a reduction in various diseases such as diabetes, cardiac disease, and heat stroke. ( Mehwish, Faiz., Saifullah, Bullo., S., Rehan., Shahzad, Nasim. (2023) )

Additionally, BMI in childhood can serve as a predictor for health and disease later in life. ( Cadynce, Peltzer., Depeesh, Khanna., Payal, Kahar., Mayur, Parmar. (2022) )

However, being overweight or obese can have negative effects on both psychological and physical health. ( Jeffrey, M., Hunger., Brenda, Major. (2015) )

Weight-based discrimination and concerns about future weight stigma can contribute to the negative impact of high BMI on health. ( Mozaharul, Mottalib., Jessica, C., Jones-Smith., Bethany, Sheridan., Rahmatollah, Beheshti. (2021) )

Furthermore, obesity increases the risk of chronic diseases such as diabetes, cancer, and stroke .

By analyzing BMI trajectories, it is possible to identify subgroups of individuals at higher risk for developing these chronic diseases .

What Are the Alternatives to BMI?

There are several alternatives to BMI for evaluating weight status in children and adolescents.

One alternative is the use of waist circumference to assess regional fat deposition. ( Stephen, R., Daniels. (2009) )

Another alternative is the use of z scores instead of percentiles to categorize BMI. ( Craig, M., Hales., David, S., Friedman., Lara, J., Akinbami., Rong, Wei., Cynthia, L., Ogden. (2022) )

Additionally, there are eight alternative BMI metrics that have been evaluated for monitoring weight status in children and adolescents with extremely high BMI. ( Kerry, Welch., Chris, Craggs. (2010) )

These alternative metrics include absolute distance or % distance of a child’s BMI from the median BMI for sex and age. ( David, S., Freedman., Jessica, G., Woo., Cynthia, L., Ogden., Ji, H, Xu., Tim, J, Cole. (2020) )

Unlike BMI percentiles, these alternative metrics do not have an upper limit and can be used for assessing BMI in all children, even those with very high BMIs. According to the same research, age-adjusted % from median works well for all ages.

Further research is needed to explore and validate these alternative metrics. So use them carefully!

What to do with the BMI Results?

Don’t worry if you find that your BMI isn’t in the “normal” range. It’s important to remember that health is about so much more than just a number.

What’s most important is that you feel cheerful in your body and that you take steps to care for yourself in the best way possible.
So whether your BMI falls in the underweight, normal, overweight, or obese range, know that you have the power to make positive changes for your health.
By eating a balanced diet, staying active, and taking care of your mental and emotional health, you can achieve a healthier, more joyful you.
Remember to always talk to a doctor or health professional if you have concerns or questions about your health.

You got this!

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