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TOPIC: Is there a tool for predicting waist size after weight loss?

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April 16, 2012 6:33 AM
Hi, I know there are BMI/Fat loss/Waist to Hip ratio calculators out there but I'd really like to know if anyone's found a waist size predictor tool where you could input your height, weight and current measurements and then it could tell you at a certain weight what your waist size in inches would be?? Anyone know of anything like this?? Would be super helpful to me as I need to order and outfit for 6 months time.
  1334970
April 16, 2012 6:34 AM
I'm not sure, it can vary greatly depending on exercise and whether you got fit or just lost weight. And people carry extra weight in different ways and lose weight and tighten up at different rates on different parts of their body.... I just don't think there's an accurate way to know where you're going to be after losing a lot of weight b/c there are so many variables.
  10992749
April 16, 2012 7:48 AM
It's a shame. I seem to loose an inch in around half a stone but I guess that'll vary as I get smaller. It's so hard guessing the right size of dress to order for October as I could be around 3 inches or more out. Just don't want to waste my money. I'd have thought that someone somewhere would collate data from all shapes and sizes and input it into a calculator like so many others out there.

After all, we all know you can't spot reduce and if you're not bulking up muscle etc. then it should be fairly easy to work out from what your current height, weight and measurements are to what they're likely to be at a certain weight. Just surprised with all the apps and calculators out there that there isn't one for this...
  1334970
April 16, 2012 8:36 AM
Since you have to order in advance I would order a little large. It is easier to have a dress altered in and almost impossible to have it altered out. If the fabric is satin or other tightly woven stuff, the needle marks will show if you take it out. Also, there is only so much fabric in a seam. Much better to have plenty of fabric to work with and have it taken in.

I am ordering my daughter's wedding dress this afternoon. She is between 2 sizes and is hoping to lose weight before her summer wedding. Since I'm the one who will do the alterations I'm ordering the larger size. if she were to lose a significant amount of weight then I can rip the whole dress apart and cut it down.
  17222510
April 16, 2012 8:40 AM
Since you can't choose where you lose, there really isn't a way to know. Also, if you do a lot of strength training, you may end up with smaller measurements at a higher weight (example - I am 5'10" and went from 45.5" to 26" waist, but I weigh around 155-160 pounds. Other women my height and weight have 30+" waists).
April 16, 2012 8:40 AM
Weight does not equal waist size.

I know people that weigh less than me that are bigger than me. Only thing that might calculate waist size would be body fat percentage.

Think about it, if you gain 10 pounds of muscle (not plausible in a short amount of time but bare with me) and lose 10 pounds of fat, you will weigh the same amount but your body composition and size will be much different between the two.
  5669343
April 16, 2012 8:41 AM
I recently had to buy a bridesmaid dress for my sister's wedding in August. I bought a dress that is tight now. I'm thinking that by the time August gets here i'll be smaller and the dress should (hopefully) fit perfectly. If I lose to much i'll just have it taken in.
April 16, 2012 8:47 AM
The problem with that is you can't even guarantee how much weight you'll actually lose in 6 months. My recommendation would be to order maybe one size down from where you are now and if you lose more than one size, you can always take it to a tailor and have it altered. If you order to small, there's not much you can do to expand it to accommodate your body size.
  18129771
April 16, 2012 8:48 AM
QUOTE:

Hi, I know there are BMI/Fat loss/Waist to Hip ratio calculators out there but I'd really like to know if anyone's found a waist size predictor tool where you could input your height, weight and current measurements and then it could tell you at a certain weight what your waist size in inches would be?? Anyone know of anything like this?? Would be super helpful to me as I need to order and outfit for 6 months time.


Unfortunately, there are no hard and fast rules for waist measurements at certain weights. A 5' 7" tall female who weighs, for instance 140lbs may have a waist measurement of 27" whereas the woman down the road at the same height and weight may have that waist down to 26". Some people have thicker waists than others.
April 16, 2012 8:56 AM
No idea on the tool, but I will share my experience.

I have a wedding to attend early June. We picked the dress back in January and I needed to get a size 20 (we think. they did not have that size in stock). I tried dress on again 3/24 and the 18 was too big but the 16 would not zip. Much to the dismay of the sales clerk, I ordered the size 16. Just recently I began to doubt myself a lot. However, on 4/13 I picked up the dress. It zipped right up. I've only lost 25 pounds in my journey, but I estimate I have lost at least 4-6 inches off my hips and 3-4 off my waist. I just redid my measurements since 3/26 and have lost 2 in both hips and waist.

With October being 6 months away, can you wait to order the dress? If not, the dress shop said they can alter up to two sizes before it begins to look unnatural. They could not alter any up however.
April 16, 2012 8:57 AM
I agree with Sharonks, buy it a bit larger then if its too big it can easily be readjusted, the same can't be said about a dress that is too small.
April 16, 2012 9:02 AM
QUOTE:
Weight does not equal waist size. I know people that weigh less than me that are bigger than me. Only thing that might calculate waist size would be body fat percentage.


Exactly. There is a guy on here who is the same height as me. He was saying the other day that he now fits into 32 inch waist pants. I weigh 15 pounds less than he does, but I'm in 38 waist pants. The difference is body fat percentage. He's in the low teens while I'm about ten percentage points higher. I'm sure his arms, shoulder, chest, and probably legs are bigger than mine . . . with only my belly measuring bigger than his!
  13285248
April 16, 2012 9:09 AM
What matters is how an individual changes over time. Not how people differ from each other. If one has logged significant reduction in waist size while dieting already, I think it's reasonable to expect it to reduce some more with continued weight loss.

So if that's so for you, and given that there are a few standard formulas estimating body fat % based partly on waist size measurement, I imagine that if you were to predict a final fat % along with weight, you could plug that into the formula to derive an estimated waist size.

It might not be accurate though, but it might be an interesting exercise.
  17400561
April 16, 2012 9:39 AM
QUOTE:

So if that's so for you, and given that there are a few standard formulas estimating body fat % based partly on waist size measurement, I imagine that if you were to predict a final fat % along with weight, you could plug that into the formula to derive an estimated waist size.

It might not be accurate though, but it might be an interesting exercise.


This might come close for a man, where there are approximate body fat formulas that depend only on weight and waist size. But for women, the formulas I've seen ( http://www.bmi-calculator.net/body-fat-calculator/body-fat-formula.php for example), use more factors than waist size.

QUOTE:
Body Fat Formula For Women
Factor 1 (Total body weight x 0.732) + 8.987
Factor 2 Wrist measurement (at fullest point) / 3.140
Factor 3 Waist measurement (at naval) x 0.157
Factor 4 Hip measurement (at fullest point) x 0.249
Factor 5 Forearm measurement (at fullest point) x 0.434
Lean Body Mass Factor 1 + Factor 2 - Factor 3 - Factor 4 + Factor 5
Body Fat Weight Total bodyweight - Lean Body Mass
Body Fat Percentage (Body Fat Weight x 100) / total bodyweight

Body Fat Formula For Men
Factor 1 (Total body weight x 1.082) + 94.42
Factor 2 Waist measurement x 4.15
Lean Body Mass Factor 1 - Factor 2
Body Fat Weight Total bodyweight - Lean Body Mass
Body Fat Percentage (Body Fat Weight x 100) / total bodyweight


Since the formula for men is so simply, I can estimate my final waist size with a minimum of assumptions.

Current weight: 220
Current waist size: 37.5
Current lean body mass: 188
Current BF: 19.2%

Holding the lean body mass constant and putting in my goal weight (208), I get:

Goal weight: 208 (assumed)
Goal lean body mass: 188 (assumed)
Goal BF: 14.5% (calculated)
Goal waist size: 34.1 (calculated)

But the original poster would have to make a lot more assumptions to use the approximate equations for women. Her wrist size probably won't change much, but I doubt anyone could make a decent guess of how the forearm and hips will change.
  13285248
April 16, 2012 10:09 AM
I saw a simpler formula for women, but I agree it's probably way too vague and error prone to be anything more than an amusement. Still, some of us like to being amused.
  17400561
April 16, 2012 10:21 AM
bodyvisualizer.com can sort of predict, but it's a fun way to play with sliders and 'see' the change.
April 16, 2012 11:06 AM
I found a calculator for both men and women that estimates body fat percentage based on weight and waist size. I doubt it's very accurate for women especially since they carry weight more places than around the abdomen. But here's what I would recommend to the original poster for a rough estimate (CW is your current weight, GW is your goal weight):

1. Go to http://www.am-i-fat.com/body_fat_percentage.html and enter your current stats to find a current body fat percentage.

2. Calculate current Lean Body Mass (LBM) using this equation: LBM = CW*(100-BF%)/100

3. Find goal body fat percentage assuming all of your weight loss is fat: G_BF% = 100*(GW - LBM)/GW

4. Go to http://www.am-i-fat.com/body_fat_percentage.html , enter your goal weight and vary the waist measurement until the calculated body fat percentage equals the goal body fat percentage calculated in step 3.

Hope that helps!
Edited by treetop57 On April 16, 2012 11:23 AM
  13285248
April 16, 2012 12:36 PM
Correction if anyone cares, which I doubt.

QUOTE:
Since the formula for men is so simply, I can estimate my final waist size with a minimum of assumptions.

Current weight: 220
Current waist size: 37.5
Current lean body mass: 178
Current BF: 19.2%

Holding the lean body mass constant and putting in my goal weight (208), I get:

Goal weight: 208 (assumed)
Goal lean body mass: 178 (assumed)
Goal BF: 14.5% (calculated)
Goal waist size: 34.1 (calculated)
Edited by treetop57 On April 16, 2012 12:36 PM
  13285248
April 16, 2012 12:48 PM
QUOTE:

I found a calculator for both men and women that estimates body fat percentage based on weight and waist size. I doubt it's very accurate for women especially since they carry weight more places than around the abdomen. But here's what I would recommend to the original poster for a rough estimate (CW is your current weight, GW is your goal weight):

1. Go to http://www.am-i-fat.com/body_fat_percentage.html and enter your current stats to find a current body fat percentage.

2. Calculate current Lean Body Mass (LBM) using this equation: LBM = CW*(100-BF%)/100

3. Find goal body fat percentage assuming all of your weight loss is fat: G_BF% = 100*(GW - LBM)/GW

4. Go to http://www.am-i-fat.com/body_fat_percentage.html , enter your goal weight and vary the waist measurement until the calculated body fat percentage equals the goal body fat percentage calculated in step 3.

Hope that helps!


Interesting, I put in some of my past points (body weight and waist) and the bf% was close to the one I got from more extensive measurements. I don't think it is going to be right in the future though because it thinks I'll lose two inches off my waist in the next 8 pounds.
  9684357
April 16, 2012 1:38 PM
Devoting more time and algebra to this problem than is warranted given the inherent inaccuracy of estimating a woman's body fat percentage from her weight and waist measurement, assuming that she loses only fat, I find the following equation for the original poster's question.


Goal Waist = 0.24727 * GW - (100 - BF%) * CW * 0.002294 + 18.633

GW is the goal weight in pounds
CW is the current weight in pounds
BF% is the current body fat percentage (as a number, not as percentage, i.e. 35, not 35%)

Note: Posts by members, moderators and admins should not be considered medical advice and no guarantee is made against accuracy.
  13285248
April 16, 2012 1:40 PM
In any case, best wishes to actresskat! Any occasion that requires ordering a dress six months in advance has to be good news.
Edited by treetop57 On April 16, 2012 1:41 PM
  13285248
April 16, 2012 2:30 PM
Thanks everyone for sharing your experiences, views and the tools you've found. Thanks for sharing your knowledge and expertise with me. I really appreciate it!

Thank you for taking the time to post!
Edited by actresskat On April 16, 2012 2:31 PM
  1334970
April 16, 2012 2:31 PM
QUOTE:

No idea on the tool, but I will share my experience.

I have a wedding to attend early June. We picked the dress back in January and I needed to get a size 20 (we think. they did not have that size in stock). I tried dress on again 3/24 and the 18 was too big but the 16 would not zip. Much to the dismay of the sales clerk, I ordered the size 16. Just recently I began to doubt myself a lot. However, on 4/13 I picked up the dress. It zipped right up. I've only lost 25 pounds in my journey, but I estimate I have lost at least 4-6 inches off my hips and 3-4 off my waist. I just redid my measurements since 3/26 and have lost 2 in both hips and waist.

With October being 6 months away, can you wait to order the dress? If not, the dress shop said they can alter up to two sizes before it begins to look unnatural. They could not alter any up however.


Thanks for sharing your experience. It's good to know that you can alter dresses by up to two sizes without changing its shape. I'm hoping to purchase what'll be the right size (or what I predict to be close) in a few months time. The shop has a limited number according to their stock checker and they are unlikely to get any more in afterwards to I want to make sure I buy what I want before it goes out of stock.

I'd rather not do alterations but I agree with you, and the others, that it's certainly a good idea to buy a little bigger just in case! :)
  1334970
April 16, 2012 2:34 PM
QUOTE:

What matters is how an individual changes over time. Not how people differ from each other. If one has logged significant reduction in waist size while dieting already, I think it's reasonable to expect it to reduce some more with continued weight loss.

So if that's so for you, and given that there are a few standard formulas estimating body fat % based partly on waist size measurement, I imagine that if you were to predict a final fat % along with weight, you could plug that into the formula to derive an estimated waist size.

It might not be accurate though, but it might be an interesting exercise.


I've lost 2 inches from loosing 11 lbs. And I read online that 10lbs equals an inch on average so I'm loosing more at the moment by I put that down mostly to being on the short side!
  1334970
April 16, 2012 3:56 PM
QUOTE:

I found a calculator for both men and women that estimates body fat percentage based on weight and waist size. I doubt it's very accurate for women especially since they carry weight more places than around the abdomen. But here's what I would recommend to the original poster for a rough estimate (CW is your current weight, GW is your goal weight):

1. Go to http://www.am-i-fat.com/body_fat_percentage.html and enter your current stats to find a current body fat percentage.

2. Calculate current Lean Body Mass (LBM) using this equation: LBM = CW*(100-BF%)/100

3. Find goal body fat percentage assuming all of your weight loss is fat: G_BF% = 100*(GW - LBM)/GW

4. Go to http://www.am-i-fat.com/body_fat_percentage.html , enter your goal weight and vary the waist measurement until the calculated body fat percentage equals the goal body fat percentage calculated in step 3.

Hope that helps!

Thank you ever so much for this. I'll have a go at this in the morning and see what it says!! Pleased you're able to work out your goal size too! It's great to have another NSV to aim for!!
  1334970

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Posts by members, moderators and admins should not be considered medical advice and no guarantee is made against accuracy.