Waist-to-Hip Ratio Calculator

What is waist-to-hip ratio?

Your waist-to-hip ratio (WHR) is one of the simplest numbers in health: your waist measurement divided by your hip measurement. Unlike BMI, which only looks at weight versus height, WHR reveals where your body stores fat — and where fat sits matters. Fat stored around the waist is linked in research with higher risks of heart disease, type 2 diabetes and other conditions, while fat carried around the hips and thighs appears to carry less risk.

That is why doctors and researchers use WHR alongside BMI rather than instead of it: BMI tells you how much, WHR tells you where. Both are screening tools, not diagnoses.

This calculator does the maths for you. Enter your waist and hip measurements (in inches or centimetres) and you will get your ratio instantly, plotted on a colour-coded gauge against the World Health Organization’s cutoffs for women — plus practical guidance on measuring correctly and what your result means.

Measure over bare skin or light clothing, with the tape snug but not tight.

Waist-to-hip ratio reference table

The World Health Organization’s cutoffs. The calculator above uses the women’s ranges.

Women Ratio Risk level
Low risk 0.80 or below Healthy range
Moderate risk 0.81 – 0.85 Worth watching
Higher risk Above 0.85 Talk to a professional
Men (for reference) Ratio Risk level
Low risk 0.90 or below Healthy range
Moderate risk 0.91 – 0.99 Worth watching
Higher risk 1.0 or above Talk to a professional

Reference cutoffs: World Health Organization.

What WHR tells you — and what it doesn’t

WHR tells you about fat distribution. Two women can share the same BMI and the same dress size yet carry weight in completely different places — one around the waist, the other around the hips — and research suggests their health outlooks differ. That is the gap WHR fills: it captures body shape, not just body size.

What it doesn’t tell you is equally important. WHR says nothing about your fitness, your muscle mass, your diet quality, your blood pressure or your overall health. A low ratio is not a certificate of good health, and a higher one is not a verdict — it is a prompt to look at the bigger picture, ideally with a healthcare professional. Bodies also change with age, pregnancy and menopause, so a single number is a snapshot, never the whole story. Use WHR as one data point among many, not as a grade.

How to lower your ratio healthily

You cannot choose where your body loses fat — spot reduction is a myth, so endless crunches alone won’t shrink your waist. What works is the unglamorous combination: regular movement mixing cardio with strength training (muscle improves how your body uses energy), balanced eating built around whole foods rather than crash diets, consistent sleep, and managing stress, which is linked with more abdominal fat storage.

Aim for slow, steady change — a centimetre or two over months, not days. Small habits compound: daily walks, protein and fibre at meals, less alcohol, and seven to eight hours of sleep. And remember the goal is health, not a number: a lower ratio achieved through punishment and deprivation isn’t a win.

How to measure correctly

  1. Waist: find the narrowest point of your torso — usually just above the navel. Breathe out normally and measure at the end of a relaxed breath.
  2. Hips: stand with feet together and measure around the widest point of your hips and bottom.
  3. Keep the tape level all the way around and snug against the skin without digging in.
  4. Measure twice and use the average if the two readings differ.

Frequently asked questions

Which is better — WHR or BMI?
Neither wins on its own; they answer different questions. BMI estimates total body mass relative to height, while WHR describes how fat is distributed. Research often finds WHR a stronger signal for certain health risks, but both are screening tools with blind spots. Used together, they give a fuller picture than either alone.
How often should I check my ratio?
Every few months is plenty. WHR changes slowly, so checking weekly only adds noise and anxiety. Measure the same way each time — same tape position, same time of day — so your readings are comparable.
Does age affect waist-to-hip ratio?
Yes. After menopause, many women notice more fat settling around the waist as oestrogen levels change — this is common and normal. It is one reason WHR can be more informative than the bathroom scale as the years pass.
Can exercise actually change my ratio?
Yes, over time. You cannot spot-reduce, but regular cardio combined with strength training reduces overall and abdominal fat, which gradually brings the ratio down. Think months of consistency, not weeks of intensity.
What about during pregnancy?
WHR is not meaningful during pregnancy — your body is doing exactly what it should be doing. Wait until a few months after giving birth before measuring again, and be kind to yourself in the meantime.
Is 0.7 the “ideal” ratio?
The 0.7 figure gets quoted a lot, usually in beauty and attractiveness discussions — not in medicine. Health guidelines don’t set an “ideal”; they set risk thresholds (0.80 or below is the low-risk range for women). Chasing a specific decimal misses the point entirely.
Important: This calculator is an informational tool, not medical advice. Waist-to-hip ratio is a screening measure, not a diagnosis. If your result concerns you — or if you have any health conditions — please speak to a qualified healthcare professional.