Body Mass Index (BMI)


Your Minumum Proper Weight


Your Maximum Proper Weight

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BMI Body Mass Index

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. See below how BMI is interpreted for adults. For adults 20 years old and older, BMI is calculated with standard weight status categories below.

  • 18-25 Normal Weight
  • 25-30 Overweight
  • 30-40 Obesity
  • Above 40 Morbid Obesity

What is BMI and how is it used?

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. BMI is an inexpensive and easy-to-calculate screening tool for measuring body fat. It is not a diagnostic tool because it does not measure body fat directly, but it is correlated with other measures of body fat.

A person’s BMI can be calculated by using the following formula:

BMI = weight (in kg) / height2 (in m2).

normal weight = 18.5 – 24.9
overweight = 25 – 29.9
obesity = BMI of 30 or greater
extreme obesity = BMI of 40 or greater

Body mass index, or BMI, is most commonly used as a tool to screen for potential weight-related health problems. By calculating your BMI, you can get an estimate of whether you are at a healthy weight, underweight, overweight, or obese. This information can then help you and your healthcare provider make decisions about lifestyle changes or treatments that could improve your overall health. Additionally, research has shown that having a high BMI is linked to an increased risk of various diseases and conditions, including heart disease, stroke, type 2 diabetes, and certain types of cancer. Therefore, knowing your BMI can be an important first step in taking steps to protect your health.

What are other ways to assess excess body fatness besides BMI?

There are a few other ways to assess excess body fatness besides BMI. One is to measure your waist-to-hip ratio. To do this, measure the circumference of your waist and then divide that measurement by the circumference of your hips. A waist-to-hip ratio greater than 0.85 for women or greater than 1.0 for men indicates an increased risk for obesity-related health problems.

Another way to assess excess body fat is to measure your body fat percentage. This can be done using a variety of methods, such as skinfold thickness measurements, bioelectrical impedance analysis, or DEXA scans. However, these methods are not always accurate and should only be used as estimates.

How is BMI calculated manually?

Measurement Units Formula
Metric Kg & meters (or cm)

Metric BMI Formula: weight (kg) / [height (m)]2

Example: Weight = 80 kg, Height = 185 cm (1.85 m)
Calculation: 80 ÷ (1.85)2 = 23.37

Imperial (Pounds and inches)

Imperial BMI Formula: weight (lb) / [height (in)]2 x 703

Example: Weight = 160 lbs, Height = 5’10″ (70″)
Calculation: [160 ÷ (70)2] x 703 = 23

Weight Management


Achieve a Healthy Weight with Our BMI Calculator

Effective weight management is crucial for individuals with Type 2 Diabetes. We understand the significance of leading a healthy lifestyle and are committed to assisting you on your journey towards better health.

Empowering You with Information

Did you know that there has been a positive shift in self-perception among obese individuals? 2012 only 34% of obese women described themselves as very overweight/obese, compared to 50% in 2007. Similarly, the percentage dropped to 25% for obese men.

Statistics: Weight in Ireland

Discover the latest weight statistics specific to Ireland:

  • Currently, 61% of adults aged 16-65 years are overweight or obese.
  • In the age group above 65 years, a staggering 79% of adults are overweight or obese.
  • Men are more likely to be overweight than women, with 42% of men and 31% of women falling into this category.
  • Obesity affects 25% of men and 22% of women in Ireland.

To determine whether your current weight falls within a healthy range, it is crucial to consult with a healthcare professional who can accurately measure your weight and height, thus calculating your Body Mass Index (BMI).

Calculate Your BMI Online

You can conveniently calculate your BMI using our user-friendly online BMI calculator or refer to the BMI chart for a quick reference.

Waist Circumference: An Important Indicator

Measuring your waist circumference (WC) is an excellent way to assess excess weight and determine potential risks, including Cardiovascular Disease (CVD). Regardless of your overall weight, a high WC can significantly increase the chances of developing CVD.

The following measurements indicate various risk levels:

  • Men: WC > 37″ (94cm)
  • Women: WC > 32″ (80cm)

For those with more substantial risks:

  • Men: WC > 40″
  • Women: WC > 35″

In Ireland, alarming statistics reveal that 26% of adults face an increased risk of CVD based on their WC, while 37% have a substantially increased risk.

Accurate Measurement Techniques

Learn how to measure your WC accurately to gain valuable insights into your health status.

Initiating the Discussion

Addressing weight-related concerns can be sensitive for both individuals and healthcare professionals. However, adopting the following strategies can facilitate open and constructive conversations:

  • Make weight monitoring a routine part of consultations to normalize the discussion.
  • Utilize a BMI chart as a visual aid to initiate conversations about weight.
  • The ICGP has developed a Weight Management Treatment Algorithm and an array of resources that can assist healthcare professionals in assessing and discussing the benefits of weight loss for overweight adults.
  • Emphasize the positive impact of a 10% reduction in body weight on various co-morbidities, such as diabetes-related death, fasting blood glucose levels, blood pressure, triglycerides, and cholesterol levels.

Setting realistic goals is vital during weight-loss discussions. The initial objective should focus on preventing further weight gain, followed by aiming for a 5-10% reduction in your original weight. It is essential to approach weight loss with a maximum weekly target of 0.5-1kg.

Evaluating Lifestyle Habits

Consider the following lifestyle habits prevalent in Ireland:

  • Only 27% of individuals consume five or more portions of fruits and vegetables daily.
  • 60% of the population consumes four top-shelf portions each day.
  • Approximately 42% of people manage to incorporate six or more top-shelf portions into their daily diet.
  • Alarmingly, 14% of individuals consume sugary drinks daily, with the percentage rising to 22% among those aged 15-24.


Measuring Your Progress Accurately

Accurately measuring your weight and tracking your progress is essential for effective weight management. Our BMI Calculator offers a convenient way to calculate your BMI in Ireland based on your height and weight. Additionally, measuring your waist circumference is another valuable tool in assessing your overall health. A waist circumference greater than 37″ (94cm) for men or 32″ (80cm) for women indicates an increased risk of cardiovascular disease (CVD), while measurements exceeding 40″ for men or 35″ for women indicate a substantially increased risk (1).

Empowering You with Knowledge

We believe that knowledge is key to making informed decisions about your health. We provide valuable resources and guidelines to assist you on your weight management journey. Our Weight Management guides, along with various educational materials, can support health professionals in assessing and discussing the benefits of weight loss for overweight individuals.

Nurturing a Healthy Lifestyle

Achieving and maintaining a healthy weight is not only about numbers; it involves adopting a holistic approach to your overall lifestyle. Our team of experts encourages you to assess your current lifestyle habits and make meaningful changes to your diet and physical activity. You can take control of your weight and well-being by incorporating more fruits and vegetables into your daily meals, being mindful of portion sizes, and engaging in regular physical activity.

Supporting You Every Step of the Way

We understand that weight management can be a sensitive topic, but remember that you are not alone in this journey. Whether you require nutritional advice, exercise tips, or access to health and well-being services, we offer the tools and guides to help you achieve your weight management goals.

Embrace a Healthier Future

Take the first step towards a healthier and happier future. Start by Using our BMI Calculator to assess your current weight, explore the valuable resources we provide, and embark on a journey of positive change.


Interesting facts about BMI calculators

  • Widely Used Metric: BMI (Body Mass Index) calculators are commonly used worldwide as a simple and effective tool to assess an individual’s weight status and overall health.
  • Universal Application: Suitable for people of all ages, genders, and backgrounds. They provide a standardized approach to evaluating body weight in various populations.
  • Height-Weight Ratio: BMI calculators use a person’s height and weight measurements to determine their BMI. It helps gauge whether an individual’s weight is within a healthy range or if they are underweight, overweight, or obese.
  • Accessibility: Readily accessible online, allowing users to obtain their BMI quickly and easily from the comfort of their own homes.
  • Health Risk Assessment: Can estimate an individual’s risk of developing certain health conditions associated with weight, such as cardiovascular disease, diabetes, and hypertension.
  • Limitations: While BMI calculators are useful, it’s important to note their limitations. They do not take into account factors such as muscle mass, body composition, and distribution of fat, which may affect the accuracy of the assessment for certain individuals, such as athletes or those with a higher muscle mass.
  • Conversation Starter: Serve as a conversation starter between healthcare professionals and individuals concerned about their weight. They can help initiate discussions about lifestyle changes, dietary habits, and physical activity.
  • Motivation for Healthy Living: BMI calculators can inspire individuals to make positive changes in their lifestyle, promoting healthier eating habits, regular exercise, and long-term weight management goals.
  • Tracking Progress: By periodically using a BMI calculator, individuals can track their progress over time and monitor changes in their weight and overall health.
  • Complementary Tools: Often used in conjunction with other health assessments, such as waist circumference measurements, to provide a more comprehensive evaluation of an individual’s health status.

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