Body fat Percentage and goal weight...
Rae6503
Posts: 6,294 Member
I'll re-post this since there seems to be confusion...
Okay, so I think I have a body fat percentage of 25%.
I weigh: 152 lbs
152 lbs * 0.25 = 38 lbs of fat,
152 lbs - 38 lbs = 114 lbs of lean body mass.
Now lets assume I lose ONLY fat and maintain all muscle (this is very rare), and lets say I want 18% body fat (which I do). So at my goal weight, I'll still have 114 lbs of lean body mass, and that will make up 82% of my body weight.
114 lbs = 0.82 * goal
My goal weight = 114 lbs / 0.82 = 139 lbs
So in summary:
Goal weight = (Current weight - current weight * current body fat percentage) / (1 - goal body fat percentage)
*Except for the fact that you most likely will lose some lean body mass along the way....
Okay, so I think I have a body fat percentage of 25%.
I weigh: 152 lbs
152 lbs * 0.25 = 38 lbs of fat,
152 lbs - 38 lbs = 114 lbs of lean body mass.
Now lets assume I lose ONLY fat and maintain all muscle (this is very rare), and lets say I want 18% body fat (which I do). So at my goal weight, I'll still have 114 lbs of lean body mass, and that will make up 82% of my body weight.
114 lbs = 0.82 * goal
My goal weight = 114 lbs / 0.82 = 139 lbs
So in summary:
Goal weight = (Current weight - current weight * current body fat percentage) / (1 - goal body fat percentage)
*Except for the fact that you most likely will lose some lean body mass along the way....
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Replies
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What will your BMI be at 114? Dropping below a BMI of 20 is too low. My goal is BMI of 20. Not sure what that will calculate in BF% but I so some lifting so I will maintain muscle.0
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114 is my lean body mass. That means ZERO body fat.0
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What will your BMI be at 114? Dropping below a BMI of 20 is too low. My goal is BMI of 20. Not sure what that will calculate in BF% but I so some lifting so I will maintain muscle.
using the BMI at all is pretty silly, IMO.
I'm overweight (at around 14 percent bf) according to it.
And will be overweight at around 10 percent by next summer.0 -
114 is my lean body mass. That means ZERO body fat.
yeah you die if you hit zero.
anything under 6% is going to be dangerous.
especially for women.0 -
What will your BMI be at 114? Dropping below a BMI of 20 is too low. My goal is BMI of 20. Not sure what that will calculate in BF% but I so some lifting so I will maintain muscle.
Her Goal weight is 139 not 114. 114 is what her projected lean mass will be.0 -
This is the correct equation if you lean body mass stayed the same. Good job.I'll re-post this since there seems to be confusion...
Okay, so I think I have a body fat percentage of 25%.
I weigh: 152 lbs
152 lbs * 0.25 = 38 lbs of fat,
152 lbs - 38 lbs = 114 lbs of lean body mass.
Now lets assume I lose ONLY fat and maintain all muscle (this is very rare), and lets say I want 18% body fat (which I do). So at my goal weight, I'll still have 114 lbs of lean body mass, and that will make up 82% of my body weight.
114 lbs = 0.82 * goal
My goal weight = 114 lbs / 0.82 = 139 lbs
So in summary:
Goal weight = (Current weight - current weight * current body fat percentage) / (1 - goal body fat percentage)
*Except for the fat that you most likely will lose some lean body mass along the way....0 -
Her goal weight is 139lbs. 114lbs is her lean body mass.What will your BMI be at 114? Dropping below a BMI of 20 is too low. My goal is BMI of 20. Not sure what that will calculate in BF% but I so some lifting so I will maintain muscle.0 -
114 is my lean body mass. That means ZERO body fat.
yeah you die if you hit zero.
anything under 6% is going to be dangerous.
especially for women.
Exactly. My goal is 18%, which is 139.0 -
Well, not dangerous. Many competitive bodybuilders come in at 4% BF for comps. Granted it's only for a day or 2, but they aren't in any real true danger.yeah you die if you hit zero.
anything under 6% is going to be dangerous.
especially for women.0 -
For women, how low you can go on BF has a lot to do with genetics and how much etrogen you produce. I've never been below 22% body fat in my entire life even when I was in incredible shape years ago. I'm got big boobs, wide hips, and thick thighs. Just my shape. Some women produce more estrogen and have more fat in their lower body than others as well.0
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using the BMI at all is pretty silly, IMO.
I'm overweight (at around 14 percent bf) according to it.
And will be overweight at around 10 percent by next summer.
For some people, using the BMI is out of date because of muscle mass but for a women who is not looking to bulk up (so you would not expect them to really have 40 extra lbs of muscle) then the BMI is another guideline to reference.
I read it wrong..... that sounds like a great goal weight.0 -
]Well, not dangerous. Many competitive bodybuilders come in at 4% BF for comps. Granted it's only for a day or 2, but they aren't in any real true danger.
Not sure if srs.
My work cpu won't let me find the link, but theres pics out there of ronnie coleman having to use an oxygen mask backstage before a competition.
It's extremely hard on your body, and an unattainable bf % without the use of steroids.
If they hold onto that conditioning for long, it's gonna do some damage.0 -
Bump. My head is spinning. I'll read this later. lol.0
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Rachel, that's a GREAT goal.
And about BMI, agreed, if you have to choose a Statistic to measure (I.E. just 1 stat, you should be using a bunch, but if you had to pick one) body fat % is the best one to use.
I'll assume that you were just looking for confirmation on this right? and that the weight is actually academic, because we all know in the real world, it won't work that smooth, you'll have to take into account lean mass differences, muscle tissue activation, water weight, glycogen stores...etc. So there's almost never a straight line between BF% and final goal weight.
anyway, that's neither here nor there.
FYI, for a female, 6% body fat is FAR to low. Below 13% for extended periods is considered dangerous, below 10% can be deadly if you leave it there long term (NOTE: these are generic numbers, some women will be different from others). For men, 6% is about the minimum, and below 3% is dangerous. For more information research the term "Essential Body Fat".
And yes, female body builders routinely go below 12% for competition, but that's usually for less than a month at a time, and they'll be the first ones to tell you, it wreaks havoc on their bodies for months after (read some research papers about competitive body builders, they would get sick for weeks after every competition, sometimes anemic, usually dehydrated, often develop symptoms of malnutrition, all for the sake of the win. It was scary to read.).0 -
3% for men and 12% for women is ESSENTIAL.0
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For women, how low you can go on BF has a lot to do with genetics and how much etrogen you produce. I've never been below 22% body fat in my entire life even when I was in incredible shape years ago. I'm got big boobs, wide hips, and thick thighs. Just my shape. Some women produce more estrogen and have more fat in their lower body than others as well.
Anyone can achieve elite fitness and low BF% with proper nutrtion and training, it's just harder for some than others.0 -
For women, how low you can go on BF has a lot to do with genetics and how much etrogen you produce. I've never been below 22% body fat in my entire life even when I was in incredible shape years ago. I'm got big boobs, wide hips, and thick thighs. Just my shape. Some women produce more estrogen and have more fat in their lower body than others as well.
Anyone can achieve elite fitness and low BF% with proper nutrtion and training, it's just harder for some than others.
I was in incredible shape and was working with a trainer and nutritionist at 22% body fat. I had an average 6:00 mile time (fastest was 5:05) and was running 30 miles per week and on a track team. For me it was really really hard, but a lot of other girls on my team were at the 15% BF range. My point was that for women, it varies quite a bit how much effort is needed to get below 20% body fat. For me, it was extremely hard.0 -
I'm not saying there aren't incidents that being that low couldn't happen. I'm saying they are rare. Coleman has competed and won 8 Olympias in a row and he did have one where he needed oxygen because he was severely dehydrated, not because of his body fat. Had that been the case, then he would have needed oxygen for every Olympia he competed in.]Well, not dangerous. Many competitive bodybuilders come in at 4% BF for comps. Granted it's only for a day or 2, but they aren't in any real true danger.
Not sure if srs.
My work cpu won't let me find the link, but theres pics out there of ronnie coleman having to use an oxygen mask backstage before a competition.
It's extremely hard on your body, and an unattainable bf % without the use of steroids.
If they hold onto that conditioning for long, it's gonna do some damage.
So yes it's hard on the body, and NOT retainable for more than a couple of days. I think it's much more dangerous to dehydrate than to have 4% body fat.0 -
For women, how low you can go on BF has a lot to do with genetics and how much etrogen you produce. I've never been below 22% body fat in my entire life even when I was in incredible shape years ago. I'm got big boobs, wide hips, and thick thighs. Just my shape. Some women produce more estrogen and have more fat in their lower body than others as well.
Anyone can achieve elite fitness and low BF% with proper nutrtion and training, it's just harder for some than others.
I was in incredible shape and was working with a trainer and nutritionist at 22% body fat. I had an average 6:00 mile time (fastest was 5:05) and was running 30 miles per week and on a track team. For me it was really really hard, but a lot of other girls on my team were at the 15% BF range. My point was that for women, it varies quite a bit how much effort is needed to get below 20% body fat. For me, it was extremely hard.
You problem was the type of traing you did was not for the goal of being lean. Being a running is sort of counter productive to reaching low BF %.
You need correct protein intake and overall great nutrition directed at increasing muscle mass and lowering bodyfat. Unless you are doing a bodybuilding style nutrtion and workout plan it's pretty hard to get that low. Running the amount that you did is antithetical to body building.
Again, nutrtion and training for a runner and nutrtion and training for a fitness model are extremely different.0 -
Based on my last Bod Pod, I should be able to come in at 14-15% at 175 pounds and I'm 5'6".
I had about 150 pounds of lean mass last time around, up from 131 the first time (18 months ago).0 -
I've recently become interested in body fat % because I enjoy having a measurable goal and building lean muscle is a goal of mine right now. I've decided not to use body fat though because most of the readily available tools for doing so are just not reliable! (drove myself CRAZY with the calipers omg) and the more accurate tools are costly and hard to get access to (e.g, bod pod-i'd have to drive 2 hours!). I am sticking with my measurements, pictures, and my ability to life more weight and do more reps as my metrics for success--a little less satisfying in some ways than a numerical goal but .... it' feels real. Body fat measurement feels----like voodoo or something
This is true. It doesn't seem very accurate, and I haven't even tried to get calipers done. All I have is a electrical impedance test (23.4%), a website calculation based on my measurements (25%), and a guess by ninerbuff based on my pictures (25%). Really want I want is to like my thighs, and not be too skinny on my upper body, this may not be possible though....0 -
I've probably mentioned bodyfat 10 times in the last week or so.
I'd say a great % of people that have drastic weight goals are doing it wrong. Especially if they are using the BMI calculations on this site. Then you get some post reading like this "I'm frustrated. I can't lose any more weight!"0 -
Fun with numbers Rachel. My favorite thing!
Tinkering with the math, if you lose 11 pounds from where you are now, and gain 1.5 pounds of muscle, you will be at 18%.
The thing is, you look awesome now. Obviously, you will look more awesome, and you will be more fit.
Lose a couple pounds a month would put you there around tax time? Gaining 1.5 pounds of muscle by tax time 2012 is doable if you manage your calories and protein between now and then.
Good luck!
PS: I'm almost in the same boat as you. Trying to lose about 8, and gain 1.5 pounds of muscle puts me at about 11.3% BF.0
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