There is no official healthy body fat percentage: neither the WHO nor Singapore's HPB or MOH publishes one. The most-quoted figures come from a 2000 paper that worked them back from BMI cut-offs and called them provisional. For Asian adults, measured in Japan, it put women at about 25% to 36% and men at about 13% to 24% between the underweight and overweight BMI lines, depending on age (Gallagher 2000).
Three numbers get used to answer the same question, and each answers a different one. Body weight measures total mass. BMI is a screening ratio built for populations. Body fat percentage describes composition — and, awkwardly for everyone who quotes a target for it, has no authoritative healthy range at all.
Screening tool: a measure designed to sort a population into groups worth looking at more closely. Not designed to describe an individual body.
Body fat percentage: the number with no official range
This is the finding most likely to surprise you, so it is worth stating carefully.
There is no authoritative healthy body-fat-percentage range for adults. Not from the WHO, whose obesity classification is BMI-based. Not as a position stand from a major exercise-science body. And not from Singapore's HPB or MOH.
The paper most often cited as the source says so itself. Its own introduction, written in 2000, states that "no accepted published ranges of percentage body fat currently exist" — and the ranges it then proposes are back-calculated by applying WHO BMI cut-offs to a regression using BMI, age and sex (Gallagher 2000). That is a statistical derivation from a different measure, not a threshold derived from health outcomes, and no consensus body has since adopted it.
A 2021 Singapore study reaches the same conclusion for this region, noting the absence of a consensus body-fat threshold for overweight and obesity, and of an Asian consensus cut-off point (Chen 2021).
The figures you will see quoted — a range for men, another for women — come from textbooks, certifying bodies and percentile charts, and different sources give materially different numbers. That inconsistency is itself the evidence. Treat any specific target you are given as unsourced until someone shows you where it comes from.
What body fat percentage is still good for: direction over time, on the same device. It tells you whether composition is moving, which body weight cannot.
The figures most often quoted, and where they come from
The paper most often cited as the source of these figures is Gallagher and colleagues, 2000. It did not set healthy ranges. It predicted the body fat percentage that matches each international BMI cut-off, and called the results provisional (Gallagher 2000). Its Asian figures, from adults measured in Japan, are these:
| Predicted body fat at the cut-off | 20–39 years | 40–59 years | 60–79 years |
|---|---|---|---|
| Women, BMI 18.5 (underweight line) | 25% | 25% | 25% |
| Women, BMI 25 (overweight line) | 35% | 35% | 36% |
| Women, BMI 30 (obesity line) | 40% | 41% | 41% |
| Men, BMI 18.5 (underweight line) | 13% | 13% | 14% |
| Men, BMI 25 (overweight line) | 23% | 24% | 24% |
| Men, BMI 30 (obesity line) | 28% | 29% | 29% |
Read as a band between the underweight and overweight lines, that is roughly 25% to 35% for women and 13% to 24% for men. Three cautions travel with those numbers. The paper states that the information needed to link body fat percentage to disease and death was not available (Gallagher 2000). The cut-offs it converts are the international ones, not the lower BMI thresholds of 23 and 27.5 that Singapore's guidelines use for the local population (HPB-MOH 2016). And every Asian participant was Japanese. These are research estimates, not a target any health authority has set.
BMI: useful for populations, weak for individuals
BMI works at scale and poorly one person at a time. It cannot distinguish muscle from fat, and it does not describe where fat is carried.
It also travels badly between populations. Using a four-compartment reference model in 291 Singaporean Chinese, Malay and Indian adults, a Caucasian-derived prediction equation under-predicted body-fat percentage by 2.7 to 5.6 percentage points (Deurenberg-Yap 2000). A given BMI here corresponds to more body fat than the same BMI predicts elsewhere.
Singapore's guidelines reflect that. The HPB-MOH clinical practice guidelines set the overweight threshold at a BMI of 23 and obesity at 27.5, rather than the international 25 and 30 (HPB-MOH 2016). We cover the reasoning in why Asian BMI thresholds are lower.
None of that makes BMI useless. It makes it a starting point that a clinician refines, rather than a verdict.
Why don't doctors use BMI anymore?
Doctors do still use BMI, but a 2025 international commission says it should not be used on its own to judge one person's health. The Lancet Diabetes & Endocrinology Commission on clinical obesity, 58 experts, recommended that BMI be used only as a surrogate measure of health risk across populations, in research or for screening, rather than as an individual measure of health, and that excess body fat be confirmed by measuring it directly or by at least one body measure, such as waist circumference, waist-to-hip ratio or waist-to-height ratio, alongside BMI (Rubino 2025). Above a BMI of 40, it said, excess fat can be assumed.
Singapore has not dropped BMI. Its national guideline still sorts adults by BMI, overweight from 23.0 and obese from 27.5, and adds waist action points of above 90 cm for men and above 80 cm for women (HPB-MOH 2016). The BMI calculator shows your BMI on Singapore's scale and on the international one.
The gap between them
The clearest demonstration of why one number is not enough: people whose BMI is normal and whose body fat is high.
In an analysis of 6,171 adults, people with a BMI of 18.5–24.9 and a high body-fat percentage had a higher prevalence of dyslipidaemia, more hypertension among men, and — among women — a significantly higher risk of cardiovascular mortality, an adjusted hazard ratio of 2.2 (Romero-Corral 2010). In the same study, body fat was not associated with cardiovascular mortality in men.
BMI did not identify those people. That is the case for looking at composition, made without needing a threshold to compare against. We cover it in what "skinny fat" means.
What to actually use
Waist-to-height ratio. Divide your waist by your height in the same units. A boundary of about 0.50 for both men and women best discriminated cardiometabolic risk across 78 studies in 14 countries (Browning 2010) — keep your waist under half your height. It costs a tape measure, it has an actual evidence-based boundary, and it responds to fat loss without being confused by the muscle you are trying to keep.
Strength in training. Loads going up over weeks is the most direct signal that lean tissue is being preserved rather than surrendered, and it is available every session.
Body fat percentage as a trend, on one device. Across fifteen bioimpedance devices tested against a four-compartment reference, only five met a ±2% standard for a single measurement — but nine met a stricter ±1% standard for tracking change over 12 to 16 weeks (Siedler 2022). The direction is worth more than the digits. What each test actually measures covers the options.
Body weight, occasionally and unemotionally. It is a noisy sample of a slow trend, and it cannot tell you what the change is made of.
At GetLean, the programme is designed to end, and our philosophy is that the composition is the goal and the weight is a by-product. Choosing the right number to watch is most of what that means in practice. The plan for coming off is the GetLean GLP-1 Taper Plan: after hitting your goal weight with the right nutrition and exercise habits built, the dose is stepped down at Dr Quek's monthly reviews towards your lowest effective dose and, where clinically appropriate, off the medication.
Individual circumstances vary, and none of these measures replaces an assessment by a doctor.
Common questions
What is a healthy body fat percentage?
There is no authoritative answer, which is not what most sources will tell you. No WHO or consensus-body range exists; the figures that circulate trace to textbooks and one research group's derivation from BMI cut-offs (Gallagher 2000), and different sources give materially different numbers. The Asian figures in that paper, from adults measured in Japan, put the body fat matching the BMI 25 overweight line at about 35% for women and 23–24% for men, and the paper itself calls them provisional (Gallagher 2000).
Is BMI useless?
No — it is a population screening tool that works poorly for individuals. Singapore's own guidelines use it, with lower thresholds of 23 and 27.5 for the local population (HPB-MOH 2016).
What should I track instead?
Waist-to-height ratio is the most useful cheap measure — a boundary of about 0.5 best discriminated cardiometabolic risk across 78 studies (Browning 2010) — alongside strength in training.
Can I trust the body fat percentage on my scale?
As a trend, not as a number. Across fifteen bioimpedance devices only a third met a ±2% accuracy standard for one measurement, though most tracked change better over 12-16 weeks (Siedler 2022).
Does BMI work differently for Asian populations?
Yes. In Singaporeans, a given BMI corresponds to a body-fat percentage 2.7 to 5.6 percentage points higher than a Caucasian-derived equation predicts (Deurenberg-Yap 2000), which is why local thresholds sit lower.