Free Tool
The standard category ranges for men and women — and the part most charts leave out, which is what the number stops telling you as you age.
American Council on Exercise (ACE) body composition chart. Generic population guidelines, not age-adjusted and not a diagnosis.
Most non-athletes land at 18–24% if they are male and 25–31% if they are female. The fitness band — 14–17% and 21–24% — is the one most people are actually aiming at when they say they want to be lean, and it is reachable without training like an athlete.
Find your category, or find the one you are aiming at. Women carry more essential fat than men at every level — the two columns are not comparable to each other.
| Category | Women | Men | Sources |
|---|---|---|---|
| Essential fat | 10–13% | 2–5% | Study4–6% lower limit, healthy mena |
| Athletes | 14–20% | 6–13% |
Studyleanest sports: men 6.4–7.9%, women 13.7%b StudyDXA floor: men 10%, women 16%c |
| Fitness | 21–24% | 14–17% |
men 12–15%, women about 20%1 men 12–15%, women about 20%2 |
| Average | 25–31% | 18–24% |
men 15–20% is protective3 women: 25% is the upper edge4 men over 20%: lose fat first5 |
| Obese | 32%+ | 25%+ |
men over 20%: lose fat first5 under 30% men, 35% women6 |
Essential fat · 10–13% women · 2–5% men
The minimum needed for organ protection, hormone production and vitamin absorption. Below this is not a target — it is a risk.
Athletes · 14–20% women · 6–13% men
Typical of people training seriously and consistently. Sustainable for some, seasonal for most.
Fitness · 21–24% women · 14–17% men
Lean and visibly conditioned, reachable and holdable without an athlete's training load.
Average · 25–31% women · 18–24% men
Where most non-athletes sit. Average is a description of the population, not a verdict on you.
Obese · 32%+ women · 25%+ men
Associated with elevated metabolic risk. A starting point for a conversation with a clinician, not a self-diagnosis.
The floor
Below roughly 14% for women and 6% for men is considered dangerously low. Body fat below this level is associated with hormonal disruption; in women it is linked to menstrual dysfunction and bone loss.
Essential fat is the floor the body cannot go below at all. This threshold sits just above it because living at that floor is itself the hazard — not a target to approach. That is why this line sits above the essential-fat band rather than below it.
The highlighted column is not from a population table. Each number is what a researcher said on tape, verbatim, at the second linked below. Where no researcher names a number for a row, the column shows a published study instead.
men 12–15%, women about 20% · healthy body fat
“protein needs should be calculated based on a lean body mass or an adjusted body weight reflecting a healthy body fat percentage so for example 12 to 15% for men and around 20% for women”
Rhonda Patrick, on FoundMyFitness, at 08:40
men 12–15%, women about 20% · relatively lean
“So, for guys somewhere like in the 12% to 15% body-fat range, for women around 20% body fat or so.”
Dr. Brad Schoenfeld, on FoundMyFitness, at 26:50
men 15–20% is protective · men, mortality data
“but like 15 20% body fat if you're a male appears to be you know a very protective effect for mortality compared to being you know 30 40% body fat”
Dr. Layne Norton, on FoundMyFitness, at 189:44
women: 25% is the upper edge · women
“I had a client like this she came in total normal weight 25% body fat which is at the upper Edge of where a woman should be”
Dr. Gabrielle Lyon, on The Dr. Hyman Show, at 49:19
men over 20%: lose fat first · men
“but too much body fat is typically the issue-- so more than, say, 20% body fat-- well, then losing body fat is going to be the primary goal for maximizing testosterone, sperm health, and spermatogenesis.”
Andrew Huberman, on Huberman Lab, at 192:29
under 30% men, 35% women · the ceiling behind the muscle targets
“So when we say these sort of numbers, it's the assumption that you're probably sub 30% body fat for a man and sub 35% for a woman.”
Dr. Andy Galpin, on Huberman Lab, at 88:49
FFMI 20 men, 18 women
“if you're a man, your FFMI should be something like 20 or higher. If you're a woman, you want to look for something like 18. So those are the targets.”
Dr. Andy Galpin, on Huberman Lab, at 88:20
No researcher on file names a number for these rows. Each line below is one sentence copied from a published paper, with the link to it. A cell marked Study points here.
4–6% lower limit, healthy men · men: 55 young soldiers after 8 weeks of training on a large energy deficit
Our results suggest that 4-6% BF or approximately 2.5 kg fat represents the lower limit for healthy men, as assessed by DEXA or by underwater weighing.
Friedl et al., Journal of Applied Physiology 1994, abstract
leanest sports: men 6.4–7.9%, women 13.7% · elite athletes in weight-class, sprint and marathon events
Athletes involved in sports where a weight class has to be made to compete, such as boxing (males, 6.9 +/- 1.6%) and wrestling (male, Junior World Freestyle 7.9 +/- 2.7%), events such as the 100, 200, and 400 meters in athletes (male 100 and 200 meters, 6.5 +/- 1.2%; female 100, 200 and 400 meters, 13.7 +/- 3.6%) that are very anaerobic in nature and extremely aerobic events such as the marathon (males, 6.4 +/- 1.3%) demonstrated lower % fat values.
Fleck, American Journal of Sports Medicine 1983, abstract
DXA floor: men 10%, women 16% · 643 competitive athletes measured by DXA, which reads higher than other methods
These data suggest that the lower limits of whole-body fat mass in free-living competitive athletes is approximately 10 % for males and 16 % for females.
Hew-Butler et al., Journal of Clinical Densitometry 2025, abstract
Precis membership
The full ACE table above is free — every category, both sexes, plus the floor and the caveats.
A free account adds
Pro adds
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
Resistance training prevents and reverses age-related muscle loss.
18 sources: 6 positive, 11 partly, 1 neutral.
Researchers say
2 positive, 10 partly, 1 neutral
Mark Hyman, 2 mentions on this claim
Positive Video
on The Dr. Hyman Show, at 21:59 · positive
“we have the capacity we just have to use it or we lose it and if we we get the problem of sarcopenia”
on The Diary Of A CEO, at 1:22:38 · partly
“it will keep your muscle strong it'll prevent what we call sarcopenia which is muscle loss”
Vonda Wright, 2 mentions on this claim
Positive Video
on The Dr. Hyman Show, at 22:11 · positive
“it is never too late because our body is meant to respond to the strategic stress we give it.”
on The Diary Of A CEO, at 51:29 · partly
“over a very short amount of time 6 months a year you can reverse the trajectory of your Frailty but it takes consistency”
Gabrielle Lyon, on The Diary Of A CEO, at 52:34
Partly Video · Opinion
Open the tape at 52:34 →“there is a transition that happens if you are not constantly fertilizing these muscles through strength and hypertrophy training through resistance exercise”
Darren Candow, on FoundMyFitness, at 08:20
Partly Video · Opinion
Open the tape at 08:20 →“after about the fourth decade unfortunately we start to lose these type two muscle fibers and so exercise has to be foundational”
Dr. Andy Galpin, on The Dr. Hyman Show, at 1:08:01
Partly Video · Their own research
Open the tape at 1:08:01 →“the folks who don't lift weights, they don't tend to have as high muscle quality. They don't they start to lose power and speed”
Andrew Huberman, on Huberman Lab, at 11:45
Partly Video · Opinion
Open the tape at 11:45 →“you perform at least five sets of resistance training per muscle per week. If we don't do that, we lose muscle over time.”
Rangan Chatterjee, 2 mentions on this claim
Partly Video
on Rangan Chatterjee's channel, at 32:16 · partly
“once you hit 30 you start to lose muscle mass every year unless you're doing something about it”
on Rangan Chatterjee's channel, at 1:26:40 · partly
“above the age of 30 we start to lose muscle mass every year unless we're actively doing something about it”
Rhonda Patrick, on FoundMyFitness, at 55:22
Partly Video · Opinion
Open the tape at 55:22 →“once you start to reach a certain age, it becomes very hard to gain muscle mass, although you can still gain strength.”
Jeff Cavaliere, on The Diary Of A CEO, at 46:14
Partly Video · Opinion
Open the tape at 46:14 →“You can dramatically slow that down by engaging in strength training and engaging in regular weight training”
Rose Anne Kenny, on Rangan Chatterjee's channel, at 1:15:02
Partly Video · Opinion
Open the tape at 1:15:02 →“because that's how you prevent sarcopenia by keeping muscles moving.”
Chris McGlory, on FoundMyFitness, at 50:30
Partly Video · Opinion
Open the tape at 50:30 →“people up to the age of 90 can certainly gain strength um when engaging with resistance exercise”
Alan Couzens, 2 mentions on this claim
Partly Video
on Rangan Chatterjee's channel, at 1:07:42 · partly
“you don't do anything that's um not not hard, but but has some some resistance to it, then then you lose muscle.”
on Rangan Chatterjee's channel, at 1:17:00 · partly
“keeping the strength uh that we already have so that these fibers don't think that they're not needed anymore and start to atrophy.”
Dr. Dan Levitin, on Rangan Chatterjee's channel, at 26:23
Neutral Video · Opinion
Open the tape at 26:23 →“sarcopenia is to muscle what osteoporosis is to bone, and so I've started doing resistance training.”
Studies show
4 positive, 1 partly
3 papers we read · 2 cited on tape, not yet checked against the paper
University of Illinois, cited on FoundMyFitness, at 30:12
Positive Study
Open the tape at 30:12 →“they saw significant increases in lean mass cross-sectional area muscle quality”
Pooled analysis, Med Sci Sports Exerc, 2011, PMID 20543750
Positive Study
Read the paper on PubMed →As such declines appear to precipitate a heightened risk for functional disabilities, including deficits in strength, gait, mobility, and essential activities of daily living, preservation or increases in lean muscle mass through RE may serve as a powerful treatment/preventive strategy.
Pooled analysis, Sports Med, 2015, PMID 26420238
Positive Study
Read the paper on PubMed →This systematic literature review and meta-analysis confirmed the effectiveness of RT on specific measures of upper and lower extremity muscle strength and muscle morphology in healthy old adults.
Pooled analysis, BMC Womens Health, 2023, PMID 37964288
Positive Study
Read the paper on PubMed →A subgroup analysis of exercise type revealed that resistance exercise had a small positive effect on lean body mass.
Maria Fiatarone, cited on The Dr. Hyman Show, at 25:50
Partly Study
Open the tape at 25:50 →“over 6 weeks they increased in function 150%. Now, a lot of that was by retraining neuromuscular pathways”
Mark Hyman Video · positive · 2 mentions
on The Dr. Hyman Show, at 21:59 · positive · Opinion
“we have the capacity we just have to use it or we lose it and if we we get the problem of sarcopenia”
on The Diary Of A CEO, at 1:22:38 · partly · Opinion
“it will keep your muscle strong it'll prevent what we call sarcopenia which is muscle loss”
Vonda Wright Video · positive · 2 mentions
on The Dr. Hyman Show, at 22:11 · positive · Opinion
“it is never too late because our body is meant to respond to the strategic stress we give it.”
on The Diary Of A CEO, at 51:29 · partly · Opinion
“over a very short amount of time 6 months a year you can reverse the trajectory of your Frailty but it takes consistency”
University of Illinois, cited on FoundMyFitness, at 30:12 Study · positive
“they saw significant increases in lean mass cross-sectional area muscle quality”
Pooled analysis, Med Sci Sports Exerc, 2011, PMID 20543750 Study · positive
As such declines appear to precipitate a heightened risk for functional disabilities, including deficits in strength, gait, mobility, and essential activities of daily living, preservation or increases in lean muscle mass through RE may serve as a powerful treatment/preventive strategy.
Pooled analysis, Sports Med, 2015, PMID 26420238 Study · positive
This systematic literature review and meta-analysis confirmed the effectiveness of RT on specific measures of upper and lower extremity muscle strength and muscle morphology in healthy old adults.
Pooled analysis, BMC Womens Health, 2023, PMID 37964288 Study · positive
A subgroup analysis of exercise type revealed that resistance exercise had a small positive effect on lean body mass.
Gabrielle Lyon, on The Diary Of A CEO, at 52:34 Video · partly · Opinion
“there is a transition that happens if you are not constantly fertilizing these muscles through strength and hypertrophy training through resistance exercise”
Darren Candow, on FoundMyFitness, at 08:20 Video · partly · Opinion
“after about the fourth decade unfortunately we start to lose these type two muscle fibers and so exercise has to be foundational”
Dr. Andy Galpin, on The Dr. Hyman Show, at 1:08:01 Video · partly · Their own research
“the folks who don't lift weights, they don't tend to have as high muscle quality. They don't they start to lose power and speed”
Andrew Huberman, on Huberman Lab, at 11:45 Video · partly · Opinion
“you perform at least five sets of resistance training per muscle per week. If we don't do that, we lose muscle over time.”
Rangan Chatterjee Video · partly · 2 mentions
on Rangan Chatterjee's channel, at 32:16 · partly · Opinion
“once you hit 30 you start to lose muscle mass every year unless you're doing something about it”
on Rangan Chatterjee's channel, at 1:26:40 · partly · Opinion
“above the age of 30 we start to lose muscle mass every year unless we're actively doing something about it”
Rhonda Patrick, on FoundMyFitness, at 55:22 Video · partly · Opinion
“once you start to reach a certain age, it becomes very hard to gain muscle mass, although you can still gain strength.”
Jeff Cavaliere, on The Diary Of A CEO, at 46:14 Video · partly · Opinion
“You can dramatically slow that down by engaging in strength training and engaging in regular weight training”
Rose Anne Kenny, on Rangan Chatterjee's channel, at 1:15:02 Video · partly · Opinion
“because that's how you prevent sarcopenia by keeping muscles moving.”
Chris McGlory, on FoundMyFitness, at 50:30 Video · partly · Opinion
“people up to the age of 90 can certainly gain strength um when engaging with resistance exercise”
Alan Couzens Video · partly · 2 mentions
on Rangan Chatterjee's channel, at 1:07:42 · partly · Opinion
“you don't do anything that's um not not hard, but but has some some resistance to it, then then you lose muscle.”
on Rangan Chatterjee's channel, at 1:17:00 · partly · Opinion
“keeping the strength uh that we already have so that these fibers don't think that they're not needed anymore and start to atrophy.”
Maria Fiatarone, cited on The Dr. Hyman Show, at 25:50 Study · partly
“over 6 weeks they increased in function 150%. Now, a lot of that was by retraining neuromuscular pathways”
Dr. Dan Levitin, on Rangan Chatterjee's channel, at 26:23 Video · neutral · Opinion
“sarcopenia is to muscle what osteoporosis is to bone, and so I've started doing resistance training.”
Where the sources disagree
Resistance training prevents and reverses age-related muscle loss.
Researchers
Mark Hyman, 2 mentions on this claim
Positive Video
on The Dr. Hyman Show, at 21:59 · positive
“we have the capacity we just have to use it or we lose it and if we we get the problem of sarcopenia”
on The Diary Of A CEO, at 1:22:38 · partly
“it will keep your muscle strong it'll prevent what we call sarcopenia which is muscle loss”
Vonda Wright, 2 mentions on this claim
Positive Video
on The Dr. Hyman Show, at 22:11 · positive
“it is never too late because our body is meant to respond to the strategic stress we give it.”
on The Diary Of A CEO, at 51:29 · partly
“over a very short amount of time 6 months a year you can reverse the trajectory of your Frailty but it takes consistency”
Studies
University of Illinois, cited on FoundMyFitness, at 30:12
Positive Study
Open the tape at 30:12 →“they saw significant increases in lean mass cross-sectional area muscle quality”
Pooled analysis, Med Sci Sports Exerc, 2011, PMID 20543750
Positive Study
Read the paper on PubMed →As such declines appear to precipitate a heightened risk for functional disabilities, including deficits in strength, gait, mobility, and essential activities of daily living, preservation or increases in lean muscle mass through RE may serve as a powerful treatment/preventive strategy.
Pooled analysis, Sports Med, 2015, PMID 26420238
Positive Study
Read the paper on PubMed →This systematic literature review and meta-analysis confirmed the effectiveness of RT on specific measures of upper and lower extremity muscle strength and muscle morphology in healthy old adults.
Pooled analysis, BMC Womens Health, 2023, PMID 37964288
Positive Study
Read the paper on PubMed →A subgroup analysis of exercise type revealed that resistance exercise had a small positive effect on lean body mass.
Researchers
Gabrielle Lyon, on The Diary Of A CEO, at 52:34
Partly Video · Opinion
Open the tape at 52:34 →“there is a transition that happens if you are not constantly fertilizing these muscles through strength and hypertrophy training through resistance exercise”
Darren Candow, on FoundMyFitness, at 08:20
Partly Video · Opinion
Open the tape at 08:20 →“after about the fourth decade unfortunately we start to lose these type two muscle fibers and so exercise has to be foundational”
Dr. Andy Galpin, on The Dr. Hyman Show, at 1:08:01
Partly Video · Their own research
Open the tape at 1:08:01 →“the folks who don't lift weights, they don't tend to have as high muscle quality. They don't they start to lose power and speed”
Andrew Huberman, on Huberman Lab, at 11:45
Partly Video · Opinion
Open the tape at 11:45 →“you perform at least five sets of resistance training per muscle per week. If we don't do that, we lose muscle over time.”
Rangan Chatterjee, 2 mentions on this claim
Partly Video
on Rangan Chatterjee's channel, at 32:16 · partly
“once you hit 30 you start to lose muscle mass every year unless you're doing something about it”
on Rangan Chatterjee's channel, at 1:26:40 · partly
“above the age of 30 we start to lose muscle mass every year unless we're actively doing something about it”
Rhonda Patrick, on FoundMyFitness, at 55:22
Partly Video · Opinion
Open the tape at 55:22 →“once you start to reach a certain age, it becomes very hard to gain muscle mass, although you can still gain strength.”
Jeff Cavaliere, on The Diary Of A CEO, at 46:14
Partly Video · Opinion
Open the tape at 46:14 →“You can dramatically slow that down by engaging in strength training and engaging in regular weight training”
Rose Anne Kenny, on Rangan Chatterjee's channel, at 1:15:02
Partly Video · Opinion
Open the tape at 1:15:02 →“because that's how you prevent sarcopenia by keeping muscles moving.”
Chris McGlory, on FoundMyFitness, at 50:30
Partly Video · Opinion
Open the tape at 50:30 →“people up to the age of 90 can certainly gain strength um when engaging with resistance exercise”
Alan Couzens, 2 mentions on this claim
Partly Video
on Rangan Chatterjee's channel, at 1:07:42 · partly
“you don't do anything that's um not not hard, but but has some some resistance to it, then then you lose muscle.”
on Rangan Chatterjee's channel, at 1:17:00 · partly
“keeping the strength uh that we already have so that these fibers don't think that they're not needed anymore and start to atrophy.”
Studies
Maria Fiatarone, cited on The Dr. Hyman Show, at 25:50
Partly Study
Open the tape at 25:50 →“over 6 weeks they increased in function 150%. Now, a lot of that was by retraining neuromuscular pathways”
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Read the full Sarcopenia evidence report →