Waist–Hip Ratio
Divide waist by hip circumference to get your waist-to-hip ratio and a rough risk band. Includes how to measure correctly and why it is only a screening hint.
Results
WHR
- Rough risk band
- Low
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Educational estimates · not financial advice · free, no signup
Formula / how it works
Screening hint only — not a medical diagnosis. Cutoffs vary by sex and guideline.
Read the guide: BMI: What the Number Means and What It Misses
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
Waist-to-hip ratio compares the circumference of your waist with that of your hips. It is a quick way to describe where body fat is carried: more around the abdomen, or more around the hips and thighs. Abdominal fat is generally associated with higher cardiometabolic risk than fat stored at the hips, which is why health bodies sometimes use WHR alongside, or instead of, BMI. This calculator takes two measurements in centimetres and returns the ratio plus a simple Low, Moderate or High band. It is meant for personal awareness and for a conversation with a clinician, not for diagnosis. People use it to track changes over months, to complement BMI, and to understand a health report.
When to use / who it helps
- You want a second measure of body shape beyond BMI, especially if BMI seems misleading for you.
- You are tracking changes in waist size over a training or nutrition programme and want a ratio that does not depend on height alone.
- A doctor, coach or health report mentions waist-to-hip ratio and you want to compute it yourself.
- You want to understand why two people with the same BMI can have different body shapes.
- You have the two tape measurements and need the ratio quickly without a spreadsheet.
How to use
Steps
- Stand relaxed and measure your waist with a flexible tape at the narrowest part of the torso, or at the midpoint between the lowest rib and the top of the hip bone, after a normal breath out.
- Measure the hips at the widest part of the buttocks, keeping the tape level around the body.
- Keep the tape snug but not compressing the skin, and measure over light clothing or bare skin.
- Enter both values in centimetres; if you measured in inches, multiply by 2.54 first.
- Read the WHR value, then the risk band.
- Re-measure at the same time of day and in the same way if you want to track change over time.
How to interpret results
- A ratio of 0.80 means your waist is 80% as large as your hips; lower values mean relatively narrower waists.
- The band uses 0.85 and 0.90 as cut-points. These are close to the thresholds the World Health Organization cites for women and men respectively, but this tool applies them to everyone.
- A single high result is not a diagnosis. Waist and hip proportions vary with ancestry, age, pregnancy and body build.
- Changes over time are often more useful than one reading; a falling ratio during weight loss usually reflects reduced abdominal girth.
- Combine WHR with other information such as blood pressure, blood tests and family history when discussing risk with a clinician.
Common mistakes & gotchas
- Measuring waist at the navel in some readings and at the narrowest point in others, which changes the ratio by several hundredths.
- Mixing centimetres and inches between the two inputs; only the ratio of two like-for-like numbers is meaningful.
- Pulling the tape tight or measuring after a large meal, which shifts the waist value.
- Applying one threshold to every population and sex. Published cut-offs differ, so treat the band as a rough hint.
- Using WHR during pregnancy or in children, where the ratio is not interpreted the same way.
Worked example
Worked example — waist 92 cm, hip 102 cm
- Measure both circumferences in centimetres: waist 92, hip 102.
- Divide waist by hip: 92 ÷ 102 = 0.902.
- Compare with the cut-points used by the tool: 0.902 is at or above 0.90, so the band reads High.
- The default inputs (80 cm and 100 cm) give 0.80, which falls in the Low band, so a 12 cm change in waist alone moves the ratio noticeably.
Result: A WHR of about 0.90 is in the High band of this screening tool; discuss it with a clinician rather than relying on the band alone.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Screening hint only — not a medical diagnosis. Cutoffs vary by sex and guideline.
Frequently asked questions
What is a healthy waist-to-hip ratio?
The World Health Organization describes substantial risk at about 0.90 or more for men and 0.85 or more for women. Exact guidance varies by organisation, so ask a clinician about your own situation.
Is waist-to-hip ratio better than BMI?
They measure different things. BMI uses height and weight; WHR reflects fat distribution. Many clinicians look at both, along with waist circumference.
Where exactly do I measure my waist?
Common guidance is the midpoint between the bottom of the ribs and the top of the hip bone, measured after breathing out normally. Use the same landmark each time.
Can I use inches instead of centimetres?
Yes, as long as both measurements use the same unit, the ratio is identical. This form is labelled in centimetres for clarity.
Does a high WHR mean I have a disease?
No. It is a screening indicator associated with higher risk in population studies; it does not diagnose anything on its own.
How often should I measure?
Monthly at most is usually enough. Daily measurements mostly capture noise from hydration, meals and posture.
For education and personal goal-setting only — not medical advice, diagnosis, or treatment. Talk to a qualified clinician about your health. Full disclaimer