A Lean Life

BMI Calculator

  • Author: David Williams
  • Date: July 12, 2018 Time: 4:19 pm
  • Category(s): Tools

Body Fat CalculatorThe BMI Calculator is a tool that measures your body mass index, also known as the BMI. This should not be confused with the Body Fat Calculator. Your body fat percentage is totally different from your body mass index. While the body fat percentage is measured using your body measurements, BMI is measured based solely on your height and weight.

You don’t have to be a fitness expert, or one who is very concerned about his or her weight, to be concerned about your BMI. Knowing your BMI is important if you want to know your fitness level. By knowing your BMI, you can know in advance if there’s something you need to be alarmed about.

BMI is not perfect and has its flaws. It simply does not work for some body types, and is not an accurate measure of certain people’s physical fitness. See more below. It is better used as a general guide based on the average person’s body type and physical build.

What is the BMI (Body Mass Index)?

Also known as the body mass index, calculation of the BMI is best for adults 20 years old and above. Children above 2 years old use BMI percentile simply because they are still at the growing stage; their height would increase rapidly through the years and their weight can go through a lot of changes too.

Among the formulas used in coming up with BMI are the following:

1. Metric BMI Formula:

Weight (kg) / Height (m)²

2. Imperial BMI Formula

(Weight (lbs.) * 703) / Height (inches)²



BMI Calculator from the Center for Disease Control (CDC)


Here are the figures you may check once you get the right number for your BMI:

  • Underweight = <18.5
  • Normal or Healthy Weight = 18.5–24.9
  • Overweight = 25–29.9
  • Obesity = BMI of 30 or greater

Unlike measuring body fat percentage, BMI doesn’t measure actual body fat. It only measures your body fat based on the relation of your weight and height. It is very simple to understand and pretty much free to measure. While you can certainly visit your doctor or fitness professional to get help measuring your BMI, you can easily use automatic tools such as the BMI calculator.

Knowing your BMI helps you come up with potential weight issues. However, you must also know that there are other ways to measure body fat that are said to be more accurate than BMI. This includes using the body fat percentage calculator, skinfold thickness measurements, underwater weighing, dual-energy X-ray absorption, and bioelectrical impedance. However, measuring your BMI is just as useful if you simply want to be aware of where your weight stands according to your height and if there’s anything you should be worried about at all.

Simply put, by knowing your BMI, you may know whether you’re on a normal weight level, underweight, overweight or obese based on your height.

Your Ideal Body Mass Index

The ranges for BMI for both men and women share the same figures. Since BMI is calculated using measurements of your height and weight, a person can share the same weight with someone and stay on the healthy level while the other may be considered overweight.

For example, a person who stands 5 feet 8 inches and weighs 160 pounds has a BMI of 24.3. He falls under the normal weight category. Another person who also weighs 160 pounds but stands only 5 feet 4 inches has a BMI of 27.5, which is already considered overweight.

You must know, however, that being categorized as underweight or overweight based on your BMI alone doesn’t automatically mean you have a health issue to worry about. While it’s best to aim for normal or healthy weight level category, you can be underweight or overweight yet remain healthy at the same time.

The Flaw in BMI

Some people are actually very healthy but aren’t in the normal range for BMI because of their physique and bone structure. For instance, athletes who have a high muscle percentage, or even someone who is generally dense and large-boned, can have a very high BMI and actually be in very good shape. So it is not a perfect indicator of fitness level, and should be used as a general guide.

After you calculate your BMI, see if you are in the normal range. If your are, that is terrific…keep up the great work! If your are out of range, check with your healthcare provider on your overall fitness level. You might find that in fact you have a high fitness level, but a misleading BMI.

Lean your body and Lean your life.

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