5 Online BMI calculators To Try

bmi calculator

BMI is a measurement of a person’s leanness or corpulence derive from their height and weight, and is calculated to appraise tissue mass. It is broadly used as a widespread indicator of whether a person has a healthy body weight for their height. Especially, the value acquired from the calculation of BMI is used to categorize whether a person is underweight, normal weight, overweight, or obese depending on what range the value falls between. These ranges of BMI differ based on elements such as region and age and are occasionally further divided into subsections such as severely underweight or very severely obese. Being overweight or underweight can have notable health effects, so while BMI is an imperfect measure of healthy body weight, it is a useful signal of whether any additional testing or action is needed. Mention the table below to check the different categories based on BMI that are used by the calculator.

BMI table for adults

This is the World Health Organization’s (WHO) suggested body weight based on BMI values for adults. It is used for either men or women, age 20 or older.

Category BMI range – kg/m2
Severe Thinness < 16
Moderate Thinness 16 – 17
Mild Thinness 17 – 18.5
Normal 18.5 – 25
Overweight 25 – 30
Obese Class I 30 – 35
Obese Class II 35 – 40
Obese Class III > 40


BMI chart for adults

This is a graph of BMI categories established on the World Health Organization data. The dashed lines appear for subdivisions within a major categorization.

bmi chart

BMI table for children and teens, age 2-20

The Centers for Disease Control and Prevention (CDC) suggest BMI categorization for children and teens between ages 2 and 20.

Category Percentile Range
Underweight <5%
Healthy weight 5% – 85%
At the risk of overweight 85% – 95%
Overweight >95%


Now Health Sectors discuss the top 5 online BMI calculators to try in 2022.

1. Calculator.Net

BMI calculator by calculator.net is number 1 on the google search engine. This is a very simple and easy-to-use tool. This is free of cost and a very handy tool. Enter your age, gender, height, and weight. This tool gives you exact results. The free BMI calculator gives out the BMI value and categorizes BMI based on information provided by WHO and CDC for both adults and children.

2. Nhlbi.nih.gov

Body Mass Index calculator by site nhlbi.nih.gov is also a free tool and easy to use. 

  • Just Enter your weight and height using standard or metric measures.
  • Select “Compute BMI” and your BMI will be shown.

BMI categories are,

Underweight = <18.5

Normal weight = 18.5–24.9

Overweight = 25–29.9

Obesity = BMI of 30 or greater

This is also a handy and simple tool to use.

3. Nhs.Uk

BMI calculator by Nhs.Uk is a very detailed tool. This tool asks about your height, weight, age, sex, ethnic group, and activity level. But, ethnic group is optional in the calculator developed by the site Nhs.Uk. Use this calculator to check you’re (BMI) and find out if you’re a healthy weight. Or you can also use it to check your child’s BMI. For checking a child’s BMI this tool asks about your child’s height, weight, date of birth, sex, and measurement date. This tool is also free just like the previous tools but it is a very detailed calculator. You need to try to check your BMI.

Related Article:

How To Calculate Your Body Mass Index (BMI)

4. Cdc.gov

Body Mass Index calculator by Cdc.gov is also a free and very simple tool to try in 2022. Just enter your height and weight then click on the button calculate then this tool will give you your results. But in the case of children, you need to enter your age/dob, sex, height, and your child’s weight. This body mass index calculator is not a source of clinical guidance. It is not a replacement for professional medical advice. Because body mass index depends on weight and height, it is only a measurement of body fatness.

5. Diabetes.ca

The body mass Index calculator by diabetes.ca is a very simple tool. This tool does not ask you for too much information just enter your height and weight then this tool shows the results of your BMI. This is also a free and easy-to-use calculator just like the previous one.

Who shouldn’t use a BMI calculator:

BMI calculator is not for muscle builders, long-distance athletes, pregnant women, the elderly, or young children. The reason for this BMI does not take into account either the weight gained as muscle or fat, just the number. Those with excessive muscle mass, like athletes, may have a high BMI but not be at higher health risk. Those with a lower muscle mass, such as children who have not finished their growth or the elderly who may stop having some muscle mass may have a lower BMI. During pregnancy and lactation, a woman’s body structure changes, so using BMI is not suitable.

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