// Basic Fitness Calculators

Waist-to-Hip Ratio Calculator

Measure your waist and hips, and see what the ratio between them indicates.

Your details

Your result

Waist-to-hip ratio
0.89
Health risk
Low

Estimates are for general guidance only and are not medical advice. For a personalised plan, book a free guided tour at RPM Gym.

What your result means

The ratio describes shape, not size. Two people at the same weight and the same body fat percentage can sit either side of a threshold here, because this measures where the fat is rather than how much of it there is.

That distinction is why the measure exists. Abdominal fat sits around the organs; fat on the hips and thighs mostly sits under the skin. Population studies have consistently linked the first pattern with cardiovascular and metabolic risk more strongly than total body weight does, which is why the WHO publishes thresholds for it and not for hip circumference alone.

How to read the categories

Men — lowbelow 0.90Below the WHO threshold for substantially increased risk at population level.
Men — raised0.90 and aboveThe WHO cut-off for substantially increased metabolic risk in men.
Women — lowbelow 0.85Under the women's cut-off. The threshold sits lower than the men's because fat distribution differs on average.
Women — raised0.85 and aboveThe WHO cut-off for substantially increased metabolic risk in women.

How it is calculated

Waist-to-hip ratio, against WHO expert consultation thresholds (2008)

Ratio = waist circumference ÷ hip circumference WHO cut-offs for substantially increased risk: men ≥ 0.90 · women ≥ 0.85

What it assumes

  • The waist is measured at the midpoint between the lowest rib and the top of the hip bone, and the hips at their widest point. Measuring the waist at the navel instead — as most people do — usually reads slightly differently.
  • Both measurements are taken standing, relaxed, at the end of a normal breath out.
  • The thresholds come from adult population data. They are not adjusted for age, ethnicity or athletic build, and the WHO itself notes that appropriate cut-offs vary between populations.

Units and rounding

  • Waist and hips in centimetres. The ratio is unitless, so inches work equally well as long as both use the same unit.
  • The result is shown to two decimal places.
  • A hip measurement smaller than the waist produces a ratio above 1 and is reported as measured rather than capped.

Worked example

A man with a 94 cm waist and 102 cm hips.

  1. Ratio = 94 ÷ 102 = 0.92
  2. Men's WHO threshold = 0.90
  3. 0.92 sits above it

A ratio of 0.92, just over the threshold. Two centimetres off the waist would put him under it — which tells you how tightly a categorical answer can hinge on tape placement.

Limitations

  • It says nothing about how much fat you carry. Someone lean with a naturally narrow pelvis can read higher than someone heavier with wide hips, and the ratio has no way to tell them apart.
  • The thresholds describe population risk. They are not a diagnosis, a prediction about you, or a reason to act on their own.
  • Tape placement moves the number more than most people expect. A centimetre at each site can cross a threshold, which is why the reading is only useful measured the same way each time.
  • Waist circumference on its own predicts metabolic risk about as well in most datasets, and it's easier to measure consistently. The ratio's advantage is that it partly adjusts for frame size.
  • Muscular athletes with developed glutes and narrow waists read low here regardless of anything else, and the measure was never validated on that population.

What to do next

  • Measure three times and take the middle value. Single tape readings at two sites compound their errors.
  • Track the waist number itself alongside the ratio. It's the half that moves with fat loss, and it's the half you can act on.
  • If the ratio sits above the threshold and you want to move it, that's a calorie question first. The deficit calculator sets the rate; abdominal fat responds to a sustained deficit, not to abdominal exercises.
  • If it sits well above the threshold, or you have a family history of cardiovascular or metabolic disease, that's a conversation with a doctor rather than a training decision.

Sources

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// Frequently Asked

Questions, answered.

What is a healthy waist to hip ratio?

The WHO puts the threshold for substantially increased risk at 0.90 for men and 0.85 for women. Below those is where most of the population sits; above them is where the association with metabolic risk strengthens. It's a population marker, not a personal verdict.

Where exactly do I measure my waist?

For this measure, at the midpoint between your lowest rib and the top of your hip bone, standing relaxed at the end of a normal exhale. That's usually a little above the navel. The important thing is using the same landmark every time.

Is waist-to-hip ratio better than BMI?

They answer different questions rather than competing. BMI describes size relative to height and misclassifies muscular people; this describes distribution and misses total fat entirely. Used together they cover more than either does alone.

Can I change my waist-to-hip ratio?

The waist half, yes — abdominal fat responds to a sustained calorie deficit like fat anywhere else. The hip half is largely skeletal and won't move much. Nothing targets abdominal fat specifically, whatever the exercise is called.

My ratio is fine but my waist is large. Which matters?

The waist. If you have wide hips, the ratio can stay comfortable while waist circumference climbs into a range that carries risk on its own. When the two disagree, the absolute waist measurement is the one worth acting on.

The waist is the half that moves. Training and food are what move it.

When abdominal fat is the thing you want to change, the starting point is a deficit you can hold and training that protects muscle through it. Both are on the table at a free guided tour in Al Manhal.

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