Ideal Waist to Hip Ratio: What the Research Says for Men and Women

Last updated: June 2026

The waist-to-hip ratio (WHR) is one of the most validated body composition metrics in clinical research — more predictive of cardiovascular disease risk than BMI in several major studies, and capable of identifying high-risk individuals who would be missed by weight-based screening alone. But what number should you be aiming for? The answer depends on whether you’re looking at it through a health lens or a body composition tracking lens — and the two don’t always point to the same target.

How WHR Is Calculated

WHR is your waist circumference divided by your hip circumference, both measured in the same unit:

WHR = Waist circumference ÷ Hip circumference

Example: Waist of 80 cm and hips of 100 cm gives a WHR of 0.80. The result is a unitless ratio — a number typically between 0.6 and 1.2 for most adults. A lower number means the waist is narrower relative to the hips; a higher number means the waist is proportionally larger.

WHO Thresholds: What Is Considered Healthy

The World Health Organization’s evidence-based cutoffs define abdominal obesity — the level at which WHR signals meaningfully elevated cardiometabolic risk:

These cutoffs were established from population studies correlating WHR with cardiovascular events, metabolic syndrome, and type 2 diabetes. They remain the most widely cited benchmarks in clinical practice and public health guidelines.

A WHR above 0.85 for women or 0.90 for men indicates that enough fat is stored abdominally — relative to hip and thigh fat — to drive metabolic risk. The risk is continuous rather than a hard cliff at the threshold, but these numbers are where risk begins to rise steeply.

What Research Says About WHR and Health Outcomes

Several large studies have tested how well WHR predicts health outcomes compared to other metrics:

WHR vs BMI

A 2015 study by Bovet and Raymond, published in PLOS ONE and drawing on data from over 15,000 adults, found that people with a normal BMI but a high WHR — meaning their weight looked fine but their fat was concentrated in the abdomen — faced significantly elevated mortality risk. This “metabolically obese, normal weight” pattern cannot be detected by BMI because BMI says nothing about where fat is distributed.

This is the core reason WHR matters. You can have a BMI in the healthy range (18.5–24.9) and still carry abdominal fat at levels that drive insulin resistance and cardiovascular risk. WHR catches this; BMI does not.

WHR as a mortality predictor

Data from the INTERHEART study — one of the largest case-control studies of heart attack risk factors ever conducted — found WHR to be a stronger predictor of myocardial infarction risk than BMI across all world regions and ethnic groups. The association held after adjusting for age, sex, smoking, hypertension, and diabetes.

The role of hip fat

A larger hip measurement — the denominator in the WHR equation — is not just neutral. Research from the Nurses’ Health Study and other cohort studies has found that hip and thigh fat (subcutaneous gluteofemoral fat) may be actively protective: it sequesters fatty acids, acts as an energy depot during pregnancy and lactation, and produces adipokines that reduce inflammation. A lower WHR may partly reflect the presence of this protective fat store, not just the absence of abdominal fat.

Ideal WHR by Age and Sex

The WHO thresholds apply broadly, but two additional factors matter:

Sex differences

Women naturally carry more body fat than men, and oestrogen directs much of that fat to the hips and thighs — driving a lower baseline WHR. This is why the female threshold (0.85) is lower than the male threshold (0.90). It reflects different baseline fat distribution, not a more lenient standard — a WHR of 0.88 carries similar relative risk for a woman as 0.93 does for a man, even though the numbers look different.

Age

WHR tends to rise with age. Oestrogen decline at menopause shifts fat redistribution in women from the gynoid (hip and thigh) pattern toward the android (abdominal) pattern, which means WHR often increases in women after their 50s even without significant weight gain. For this reason, tracking WHR over time — not just comparing to a single threshold — is particularly informative for women entering and going through menopause.

Ethnicity

The WHO cutoffs were derived primarily from European and North American populations. Research has found that people of Asian descent carry higher metabolic risk at lower absolute WHR values — some guidelines suggest adjusted thresholds for South Asian, East Asian, and Southeast Asian populations. If you’re using WHR as part of clinical health monitoring, the specific threshold your healthcare provider uses may reflect ethnicity-adjusted guidelines rather than the generic WHO values above.

What Is a Good WHR to Aim For?

The WHO risk thresholds are a floor, not a target. Being just below the threshold does not make a WHR “ideal” — it makes it “not in the elevated-risk zone.” From a health optimisation standpoint, a better target:

• Women: WHR of 0.75 or below is associated with lower cardiometabolic risk in most population studies. The very low end (below 0.65) can reflect extremely low body fat in general, which carries its own health considerations for women.
• Men: WHR below 0.85 is associated with lower risk across most large studies. Values in the 0.80–0.85 range are generally considered healthy for fit, active men.

These are not hard cutoffs — they are ranges where population-level data shows consistently lower risk. Individual variation, genetics, and overall fitness level all matter.

How to Improve Your WHR

WHR improves when the waist measurement decreases relative to the hips. Because hip circumference changes slowly (it’s largely determined by bone structure and subcutaneous fat that is resistant to rapid reduction), the most effective approach is reducing abdominal fat:

• Caloric deficit: Fat loss is driven primarily by sustained energy deficit. Abdominal fat — especially visceral fat — tends to be the most responsive to caloric restriction of any fat depot.
• Resistance training: Building muscle increases resting metabolic rate and preferentially reduces visceral fat relative to subcutaneous fat in research studies.
• Reducing refined carbohydrates and added sugar: Dietary patterns high in refined carbohydrates drive elevated insulin and preferential visceral fat deposition. Reducing these directly targets the fat type that drives WHR above threshold.
• Sleep and stress: Cortisol — elevated by poor sleep and chronic stress — promotes visceral fat accumulation independently of caloric intake. Improvements in sleep quality have measurably reduced waist circumference in controlled studies.

There is no way to spot-reduce fat from a specific location, but the interventions that most effectively reduce abdominal fat also most effectively improve WHR.

Limitations of WHR as a Health Metric

WHR is a useful screening tool, but it has real limitations:

• It measures fat distribution, not fat quantity. Two people with the same WHR can have very different total body fat percentages and different absolute amounts of visceral fat.
• It requires accurate measurements. A waist measurement taken 2 cm too low or a hip measurement taken at the hip bone rather than the widest buttocks point will produce a misleading ratio.
• It doesn’t account for muscle mass. A lean, heavily muscled person with large gluteal muscles may have a low WHR due to hip size rather than fat distribution — which is meaningless from a health risk perspective.
• The thresholds are population averages. Individual variation in body proportion means the same WHR can correspond to different levels of visceral fat in different people.

Used alongside waist circumference in absolute terms, and ideally alongside other markers like blood lipids and fasting glucose, WHR is a genuinely useful indicator — not a definitive health verdict on its own.