BMI Calculator - Body Mass Index
The BMI calculator is a valuable tool to determine if you are overweight, underweight, or just right. Your weight alone isn't sufficient to make a distinction, as tall, thin men might weigh more than women who are short, but not grouchy. Body mass index also known as BMI can overcome this problem by finding a ratio between your body weight and height, and returning one number. This number can be classified into a category on the scale of BMIranges that are defined as underweight normal, overweight, and obese.
To work out your body mass index on your own and find out what your number means for you, you'll need to be aware of:
- How do I calculate BMI.
- What is normal BMI.
- What the various BMI ranges are.
How to calculate BMI
Then, let's go over the equation:
- Divide your weight (in kgs) with your height (in metres).
- Divide the answer by your height once more for your BMI.
The formula for the body mass index is as follows:
BMI is weight/height2.
Normal BMI
Our BMI calculator makes it easy for you to find your number. Please note that BMI is an estimate of a certain amount. The results can be confusing for people with a strong physique (such as bodybuilders) as well as for those who have experienced significant loss of muscle (such those who are elderly).
If you're unsure of whether or not you are in the "normal" range of muscle mass, please consider using one of our specialized calculators. Our body fat calculator is able to pinpoint your percentage of body fat, and using our calculator to calculate lean mass will reveal how much you'd weigh without fat.
BMI ranges
There are five basic ranges within the BMI scale:
- The term "underweight" means less than 18.5
- Normal weight equals 18.5 - 24.9
- Overweight = 25 - 29.9
- Obesity = 30 - 35
- Severe obesity = 35 years old or more
BMI Prime BMI Prime is a useful adaptation to our BMI calculator. It's a decimal figure where 1.0 = the highest point in that "normal BMI" range. It's a great way to find out if you're overweight or not. If the BMI Prime is greater than 1, then you've got some pounds to lose.
Making use of the body mass index calculator on our site
On the top of our BMI calculator are fields that allow you to plug in your dimensions and bodyweight. Input these numbers, and you'll instantly have your BMI, it's BMI Prime (see above) and a short message that will tell you which the range of values you fall within.
If you're overweight and want to know precisely what you'll need to lose to get to that healthyrange, you can do that too. Place your height and weight in the boxes as they are and then type "0.9" into the BMI Prime box. Your weight and BMI will adjust themselves.
Tip: If the height of your box is adjusted when you change other boxes, it's time to be able to lock it. The right hand side of the box. Click the lock icon. This will hold that number in place as you play with the values in other boxes. This is... except if you're planning on growing larger!
Other considerations
If you're interested in knowing whether your metabolism is in your favor in your quest towards getting to a healthy weight, take a look at this basal metabolism rate calculator (or its variant with The Harris-Benedict Formula). We frequently hear about factors that can affect our metabolism (which is it that skipping breakfast results in?) But we rarely hear about tracking these changes. That's exactly what this calculator is to track those changes.
Your basal metabolic rate refers to the activity level of your body's metabolic rate when you awake in the early morning. In this is most stable time for assessing your metabolism, as the day's not had enough time to warm you up!
Once you've learned how to calculate BMI, the next logical figure to know is your ideal weight. Use our perfect weight calculator and figure this out in a snap.
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