# Calculate your ideal body weight

With this calculator you can calculate your ideal weight. The ideal body weight is the weight, which theoretically will give you the longest life with the least diseases.

The calculator and the theory behind it illustrates that many people might not have the need for weight loss they think they do.

How to calculate
Enter gender, height and body type in the calculator. Body type is your own assessment of whether you have a small/thin or wide/heavy skeletal structure. You must ignore your body fat in the this assessment. You might base your assessment on how you looked when you were younger.

Background for the calculator
The calculation of ideal body weight is based on what is the optimal BMI in relation to the likelihood of a long life with the least diseases. Recent large studies indicate that the lowest mortality actually occurs at BMI values ​​close to overweight. However, one should not for that reason pursue an overweight BMI, as there are problems associated with obesity that are unrelated to mortality. This could be issues with osteoarthritis, physical activity, sleep and non-fatal diseases.

In this calculator ideal body weight is set, so that it takes into account lowest mortality as well as other problems that may be linked with obesity. Since BMI is misleading for people with either a light or a heavy skeletal frame, adjustment for body structure is included.

What is the optimal BMI for men and women?
If one looks broadly at the core studies, it is reasonable to conclude that the optimal BMI is between 20 and 27. In studies that have gone deeper into the difference between men and women, it seems that either the same optimal range applies or that men are 2-5 BMI points higher. In the calculator the ideal BMI is set to 22.5 for women and 24.5 for men.

 Reference Optimal BMI range JAMA 2013 All: 25-30 BMC MRM 2011 Female: 20.1-24.6 Male: 26.4-27.5 NEJM 2010 Female: 21,3-26,3 Male: 22.5-28.8 Lancet 2009 All: 22.5-25.0 NEJM 2006 Female: 23.5-26.4 Male: 25.0-27.9 NEJM 1999 Female: 20.5-24.9 Male: 22.0-26.4

The new very large study from JAMA 2013 overestimate the benefits of overweight, because overweight is compared with normal weight defined as BMI 18.5 to 25 We know from other studies that mortality is significantly elevated for BMI values ​​between 18.5 and 20 The range we usually consider normal weight therefore include BMI values far from optimal.

How big is the uncertainty of ideal body weight?
In most studies, the risk only slightly increases if the BMI value is a few BMI points from the optimum. This effectively means that if your actual weight is within +/- 12 lbs (6 kg) of ideal weight, it is still within the optimal range.

What is the influence body structure?
If you're looking at body structure as differences in frame size / width of skeleton, then the original ideal weight tables from the 1960s had a correction of plus-minus 10 % of body weight. If you look at recent studies, it appears to be the norm, that differences in skeletal width can affect body weight 6-8 % in each direction. This calculator therefore has a built in adjustment of plus-minus 8 %.

Should you drink cream if you are too light?
No, even if your body weight is 10-16 lbs (5-8 kg) under your ideal weight, it should not be your goal to increase your body fat, but rather your lean body mass. The best thing you can do is to eat enough healthy food and do activities that increase your muscle mass.

Should you go on a diet if you are too heavy?
From a health point of view - probably not. If your BMI is above 30 and you have low muscle mass and lifestyle diseases such as type 2 diabetes, then you should consider to lose weight, but otherwise not. Dieting will for most people be harmful in the long term.

Difference between smokers and non-smokers
For smokers or former smokers the lowest mortality rates are seen at higher BMI values ​​than for non-smokers. The explanation is partly that smokers often develop diseases (eg. COPD), resulting in low body weight. Smokers that are not yet sick will probably be in a better position to cope with future disease if their body weight is in the overweight range. Ideal values ​​in the calculator is set against a mixed population of smokers, ex-smokers and never-smokers.

Influence of age
In general, the optimal BMI increases with age. Roughly speaking, one can say that young people should preferably be in the normal weight range and older people in the overweight range  - at least in terms of the overall mortality. Also for older people one should still remember that obesity can cause other problems such as problems related to the musculoskeletal system and the ability to be mobile.

Overall conclusion
There are many indications that we should  adjust our limits for what is considered a healthy BMI. Generally, a BMI between 20 and 30 should  not cause concern if you are in all other ways healthy. Even if you have a BMI between 30 and 35 and are otherwise free of any disease, then it might still be a bad idea to go on a diet. Especially because we know that repeated dieting is short-term healthy, but long-term harmful. The studies also clearly shows the increased risk of having a very low body weight and therefore this calculator is also intended to help normal-weight people to understand that they should not lose weight.

References

Body-mass index and mortality among 1.46 million white adults. Berrington de Gonzalez A et al.
N Engl J Med. 2010 Dec 2;363(23):2211-9.

Body mass prediction from skeletal frame size in elite athletes. Ruff CB.
Am J Phys Anthropol. 2000 Dec;113(4):507-17.

Body-mass index and mortality in a prospective cohort of U.S. adults. Calle EE et al.
N Engl J Med. 1999 Oct 7;341(15):1097-105.

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#16 Tris 2015-11-05 09:52
Hi I don't know if I have a narrow or wide body type, my mom says it's wide but I did a test based on my wrist size and according to that I'm very narrow. But then I have unusually small hands. Is there another test for frame size?
I'm just below my ideal weight for narrow body type and I don't look underweight, if that helps.
#15 Dawn 2015-06-22 05:35
I am a small framed petite woman weighing 107 lbs. I have two adult children (21 and 23). There just isn't any way my ideal weight is 120# as I have never weighted that much in my life!
#14 gurpreet 2015-04-28 09:30
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#13 Tony Farrow 2015-04-19 05:55
BMI which is frightning the hell out of people.BMI IS DANGEROUS.
6 National state medical magazines for Drs, in Japan, UK,Singapore,Ge rmany,Spain,Chi na, o BMI issue gives differant weight areas. The BMI usage,non athelete and atheletes are in turmoil.its also turning good fit people onto Diets which is totally wrong.One person I know is upset as hes joining the Royal Navy, he goes to the gym every day, plays rugby twice a week, once a week football, and recently has been running 1.5 miles a day too to make sure he makes the test of 1.5 miles in 11 mins 11 secs, which in a week does the 1.5 miles in 10 mins 15, fantastic. But recently everything all IS going well and was left a message to call the RN about his final interview and his BMI Now you tell me how more fitter a person of 18 could do 7 days a week, if he fails now on this BMI issue after being so fit before thinking of the RN, I can see maybe a Judicial Court request on this ridicoulous instrument which is out of date.
#12 neal 2015-03-30 04:12
5'10" 220lb 29 male stocky build with thick muscle legs. Thanks for the article. I could stand to lose 20lbs but not 40+lbs like most charts would say. This is useful/realist information. All these underweight girls need to bulk up to what this chart reads. Your skewed vision of yourself is a from society. Youre in as much danger being underweight as people who are far overweight. Beauty changes with memes, knowledge, and age.
#11 Cali 2014-04-16 19:22

I am a 17 year old girl, 5 foot 5 inches tall, with a narrow bone structure. I weight 108 lbs, and I found this website because I really, really, really want to loose a few pounds, like at least 9 or 10. However, this tells me my ideal weight is around 125 lbs. I already feel that I look very chubby, and would like more than anything to take off that excess weight. What should I do?
#10 Chloe 2014-03-27 20:45
Hi I'm 14
I'm 5ft 8inchs
I'm spoused to be 61.6kg I'm 53kg
#9 Matthew lichtman 2014-03-14 00:14
Im at my ideal weight on this.
#8 Rachel 2014-02-08 21:23
Quoting Heather:
Hi I am 26 with 6 amazing kid's and a great husband but before kids I was 115lbs now I am 225lbs I had my last baby may 8,2012 and got my tubes tied but I had 4 c-cections I have been trying to lose weight for 4 months I started at 245lbs but now the weight is not going anywhere I have been the same for the last month not more or less weight help now what should I do

This is a common problem that a lot of people experience when they try to lose more than 10-20 lbs at a time. It is called a plateau and really you just have to wait it out. Keep doing what you're doing & don't get discouraged. There are many things you can do to get off a plateau, but the most successful solution is time & patience. I have been losing weight steadily & successfully for the past two years and have been on several plateaus. They stink at the time, but once they are done, the weight comes off quick! Read up on this & set point weight- hope it helps & good luck!
#7 Tim 2014-02-08 16:23
Be careful - this calculator does not convert between kg and lbs correctly! E.g. 138.3 lbs does not convert to 58.3 kg!
#6 Janine 2013-08-26 18:56
Quoting stummee:
Your article is misleading. That is a first for me to hear that short term dieting is harmful in the long run. Where is the reference rather than just saying this! Also, I get tired of general talking like older people can be overweight. What are older people? What is overweight? Why do you say a BMI between 30-35 is fine and you shouldn't diet?

I agree, and also this article tells a boldfaced lie when it says that people with BMI between 18 and 20 have a high mortality rate, Actually, I read a study that showed people with BMI between 18 and 20 have the LOWEST mortality rate of any group. Yes, even a BMI of 18, which is usually classified as medically "underweight", had lower mortality than a BMI of 21.
#5 Rosa Warrington 2013-06-14 03:18
Class
#4 Morten Z 2013-06-02 19:43
The article is certainly not misleading, but it might be controversial to some. See this recent paper in Nature that follows up on the topic:
http://www.nature.com/news/the-big-fat-truth-1.13039
In regard to short-term weight loss, this paper has some good points:
http://www.ncbi.nlm.nih.gov/pubmed/22586192
#3 stummee 2013-06-02 01:13
Your article is misleading. That is a first for me to hear that short term dieting is harmful in the long run. Where is the reference rather than just saying this! Also, I get tired of general talking like older people can be overweight. What are older people? What is overweight? Why do you say a BMI between 30-35 is fine and you shouldn't diet?
#2 carolyn 2013-05-10 14:16
Hi Heather

Join a weight loss club like Slimming World or Weight Watchers or if you don't have time for that use an app/website like My Fitness Pal (I use this and it's great).

Don't try to lose the weight too quickly. It didn't go on fast so take your time losing it. This means eat enough but not too much. Don't starve yourself - you know you can't keep that up. Do gentle exercise like walking, build up your speed and fitness slowly. Keep going and have patience
#1 Heather 2013-05-09 03:27
Hi I am 26 with 6 amazing kid's and a great husband but before kids I was 115lbs now I am 225lbs I had my last baby may 8,2012 and got my tubes tied but I had 4 c-cections I have been trying to lose weight for 4 months I started at 245lbs but now the weight is not going anywhere I have been the same for the last month not more or less weight help now what should I do