BMI Calculator

Age

Gender

Height

Weight

This is a general screening tool, not medical advice. BMI does not account for muscle mass, bone density, or overall body composition. Talk to a doctor or qualified health professional for guidance about your individual health.

Use our free BMI calculator to easily and quickly determine your BMI (Body Mass Index). Calculate your BMI and find out your BMI category, healthy BMI range and estimated healthy weight range by entering your age, gender, height and weight. With our BMI calculator in kg and feet, it’s easy to input your height in feet and inches, and your weight in kilograms to determine your BMI. It can be used by a variety of ages and you will see your result immediately, without the need to register.

How it Works

Use the BMI calculator to find your BMI in just a few simple steps. Fill in your data, select your preferred units and receive your BMI immediately.

Step 1

Enter Your Age

Please enter your age to give more context to your BMI calculation.

Step 2

Select Gender

Select your gender or Other / prefer not to say. This field is left optional on the calculator for a more flexible experience.

Step 3

Please enter Your Height and Weight.

Type in your height in feet and your weight in kg. The units of measurement that are available can also be selected.

Step 4

Calculate Your BMI

Click Calculate BMI to get your BMI instantly, BMI category, BMI range and healthy weight range estimates.

Why Use Our BMI Calculator?

Using our BMI calculator online, you can easily work out your BMI from your height and weight, without having to do any manual calculations.

Calculate BMI using kg and feet measurements.

Our easy-to-use BMI calculator in kg and feet is available for you to use, providing you with weight in kilograms and height in feet and inches.

Instant BMI Result

Input details and get your BMI result in real-time.

BMI Category

Your result is shown with a standard adult BMI category (underweight, normal, overweight, obesity).

Healthy BMI Range

The calculator will show you the normal range of BMI for adults for reference so you can interpret your results.

Reset and Recalculate

If any of the data is changed, calculate a new BMI.

Free Online Calculator

Access the calculator online without software download, account registration and subscription fees.

BMI Calculator For Woman and Man

BMI calculator male or female search normally indicates the calculation of BMI based on the same relationship of height and weight. The basic BMI formula does not need to be adjusted for sex for adults.

We have added a gender selection to our calculator, so that the user can enter extra information, but the BMI is calculated according to the height and weight.

BMI categories may also vary in the different populations and situations, so BMI should be used as a screening tool and not as a definitive means of assessing a person's health.

BMI Calculator with Age

You can enter your age in our BMI calculator kg along with your height and weight before calculating your BMI.

BMI is typically determined by dividing weight by height for adults:

BMI = Weight (kg) ÷ Height (m)²

If someone has a height of about 1.63 m and a mass of 65 kg:

BMI = 65 ÷ (1.63 × 1.63) ≈ 24.5

The calculator converts units and calculates automatically.

Please note, adult BMI categories cannot be used for children and adolescents. BMI interpretation is typically performed using the age- and sex-specific growth references and not the standard adult categories for the children under 20 years of age.

Discovering your BMI Result

BMI is based upon weight and height. For adults, commonly used BMI categories are:

BMI Normal adult weight ranges

Below 18.5 Underweight

18.5–24.9 Healthy weight

25.0–29.9 Overweight

30.0 or higher Obesity

These are the categories typically used for screening for adults BMI, but BMI is a measure of total body weight, which includes body fat, muscle, bone, and other body weight.

Therefore a BMI result should be interpreted in the context of other factors that determine health.

BMI Calculation Formula

The BMI calculator formula is:

BMI = Weight in kilograms ÷ Height in meters²

The height should be in feet and inches, but must be converted to meters.

For example:

5 ft 4 in = approximately 1.63 m

If your weight is 65 kg, then:

BMI = 65 ÷ (1.63²) ≈ 24.5

All these conversions are done automatically in our calculator, so you don't have to do the calculation manually.

BMI Categories Explained

Underweight

A BMI of less than 18.5 is in the normal range for a BMI of an underweight adult. BMI is not enough to know the reasons for losing weight.

Healthy Weight

BMI of 18.5 to 24.9 is considered healthy for an adult. This range is indicative and not diagnostic.

Overweight

The BMI range between 25.0 and 29.9 is the normal adult overweight classification.

Obesity

BMI of 30 and above is in the range of normal adult obesity. BMI cannot be used to determine the proportion of fat to lean tissue in a person's weight.

BMI and Healthy Weight Range

The height can be used to estimate the weight range that falls within the "normal" BMI of adults between 18.5 and 24.9.

For instance, one of the screenshots shows a height of 5 ft 4 in, and for a 65 kg weight, the BMI is about 24.6. The calculator will also calculate the corresponding estimated weight range of this height.

This is a mathematical BMI range not a medical recommendation.

Commonly used Applications of BMI Calculator

Personal BMI Check

Find your BMI easily, by entering your current height and weight.

Fitness Tracking

BMI is used as one simple indicator to measure body weight changes over time.

Weight Monitoring

Using BMI following weight change to observe the numerical change.

Health Education

Understand the relationship between height and weight in terms of the BMI formula and typical adult weight ranges.

Online Calculations

Use online BMI calculator, do not do all calculations of the feet, inches, kilograms and meters yourself.

Understanding BMI Ranges

Understand the normal adult BMI ranges and what they mean when a BMI is calculated.

BMI Calculator in kg and Feet

This calculator is designed to make it easier for you to calculate your BMI, should you be used to weighing yourself in kilograms and measuring your height in feet and inches.

Simply enter:

Weight: kilograms (kg)
Height: feet and inches (ft/in)
Age: your age
Gender: optional selection

The calculator will automatically pre-calculate the height measurement and use the BMI formula.

BMI Calculator vs BMI Formula

Use the BMI calculation formula, which can be done manually, or use an online BMI calculator, eliminating the need for conversions.

Feature	Manual Calculation	Online BMI Calculator
Enter weight	Yes	Yes
Enter height	Yes	Yes
Unit conversion	Manual	Automatic
BMI formula	Manual	Automatic
BMI category	Manual lookup	Displayed automatically
Healthy BMI range	Manual calculation	Displayed
Calculation speed	Depends on user	Instant

Limitations of BMI

BMI is a useful screening tool for the population as a whole and also for the individual, but has some limitations.

Does not measure body fat or indicate fat distribution. However, those with a high muscle mass may be classified as having a high BMI but actually have low body fat.

BMI should be interpreted differently for children and adolescents and may not be a valid measure of child health status or for some other groups.

BMI is used as a tool in making an individual health decision and should be used in conjunction with other information, and if applicable, a qualified health care professional's inputs.

Frequently Asked Questions

Everything you need to know before you start converting.

What is a BMI calculator?

BMI calculator is an online application which calculates BMI for a person based on his/her weight and height. It can then compare its results with the typical BMI categories of adults.

How can I determine (in kg and feet) my BMI?

Enter weight in Kg and height in Feet and Inches. The calculator automatically calculates the height in meters and then uses the BMI formula.

Which is the formula for BMI calculator?

BMI is defined as weight (kg) divided by the height in meters squared.

Will this BMI calculator cost any money?

Yes. The BMI calculator can be used online without paying a cent or signing up for anything.

Is this BMI calculator suitable for men?

Yes. There is a way for men to enter their age, height and weight to calculate BMI. Adult BMI is a formula that uses height and weight.

May women use this BMI calculator?

Yes. The calculator can be used by women to work out their BMI from a height and weight. BMI is calculated in the conventional manner using body weight and body height.

Does age have an impact on BMI?

BMI is important to consider for interpretation in some populations or age groups. BMI is not useful as a standard classification system for children and adolescents, but is usually assessed by age- and sex-specific growth references.

What is a normal BMI?

In adults, BMI of 18.5 to 24.9 is considered healthy weight. BMI should only be used as a screening tool and is not a full health assessment.

Is BMI a measure of body fat?

BMI is a measure of height and weight, and does not measure body fat, muscle mass or fat distribution directly.

Is BMI a good indicator of what my ideal weight is?

BMI can be used to determine the weight range that is within the normal BMI range for an average adult's height. This should not be considered the ideal weight for individuals however.

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