HealthScorer

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio (WHR) with WHO 2008 cardiometabolic risk thresholds. Often a stronger CV-risk predictor than BMI.

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What waist-to-hip ratio measures

WHR is the simplest signal we have for central (visceral) obesity — the kind of fat that drives cardiovascular and metabolic disease. Unlike BMI it doesn’t conflate muscle and fat, and unlike body-fat percentage it doesn’t require specialised equipment or calculation. Just a tape measure.

WHR = waist circumference / hip circumference

The ratio is unitless. A man with 95 cm waist and 100 cm hips has WHR 0.95. A woman with 70 cm waist and 100 cm hips has WHR 0.70.

WHO 2008 cardiometabolic risk thresholds

Risk levelMen (WHR)Women (WHR)
Low≤ 0.90≤ 0.80
Moderate0.90 – 0.990.80 – 0.84
High≥ 1.00≥ 0.85

These values come from the WHO Expert Consultation report (2008). They’ve been replicated in multiple subsequent meta-analyses including de Koning et al. 2007, which pooled 15 studies and found that each 0.01 unit increase in WHR was associated with a ~5% rise in cardiovascular events.

Why this beats BMI for heart disease risk

BMI conflates lean and fat tissue. A 90 kg muscular man and a 90 kg sedentary man with belly fat both register the same BMI. WHR splits them apart. The INTERHEART study — 27,000 myocardial infarction cases vs controls across 52 countries — found WHR was approximately twice as predictive of MI as BMI was, particularly in non-Western populations.

The mechanism: visceral fat (the kind around abdominal organs) is metabolically active. It releases free fatty acids directly into portal circulation, drives hepatic insulin resistance, and elevates inflammatory markers like CRP. Subcutaneous fat on hips and thighs doesn’t behave the same way.

How to measure (do it once a month)

  1. Stand relaxed, feet together, arms at sides.
  2. Wait until the end of a normal exhalation — don’t suck in.
  3. Waist: locate the narrowest point between your lowest rib and your iliac crest. For most adults this sits within a few centimetres of the navel.
  4. Hips: identify the widest point of the buttocks viewed from the side.
  5. Tape measure should be snug but not compressing skin.
  6. Take each measurement twice; if the two readings differ by more than 1 cm, do a third.

A small consistency tip: same time of day, ideally in the morning, before eating.

Pair with our other tools

WHR is one piece. For a complete metabolic snapshot:

Limits

  • Pregnancy: WHR is not interpretable.
  • Significant weight changes: re-measure after 2–3 weeks of stable habits.
  • Body shape genetics: some people carry visceral fat without an obviously high WHR (the “TOFI” phenotype — thin outside, fat inside). If your fasting glucose, triglycerides, or HDL are abnormal despite a normal WHR, follow up with your clinician anyway.

Privacy

All calculation happens in your browser. We never see, log, or store your measurements. Anonymous risk-category events are sent to our privacy-first analytics service.

Frequently asked questions

Why is WHR a better cardiac risk predictor than BMI?
BMI doesn't distinguish where fat is stored. The INTERHEART study (Yusuf 2005, 27,000 participants in 52 countries) showed that WHR predicted myocardial infarction roughly twice as well as BMI did. Visceral fat — the kind concentrated around the waist — is metabolically active and drives insulin resistance, inflammation, and atherogenic lipid profiles. WHR captures that signal directly.
What are the WHO thresholds?
The 2008 WHO Expert Consultation set substantial-risk cut-offs at WHR ≥0.90 for men and ≥0.85 for women. Below 0.90 (men) / 0.80 (women) is low risk; the band between is moderate. These are population-level thresholds — individual risk also depends on age, lipids, blood pressure, and family history.
How should I measure correctly?
Stand relaxed. Measure your waist at the narrowest point between the lowest rib and the iliac crest (often near the navel) at the end of a normal exhalation. Measure hips at the widest point of the buttocks. Same units throughout (cm or in). Repeat both measurements twice and average.
Does waist measurement alone tell the same story?
Almost. Waist circumference correlates strongly with WHR and is what most clinical guidelines use for quick screening (men ≥102 cm or women ≥88 cm = elevated risk per IDF/NCEP). WHR adds the hip denominator which improves accuracy in people with very different body shapes. For most adults, both measures rank you the same way.
Does the data leave my device?
No. Calculation runs entirely in your browser. Anonymous events (your risk category) are sent to a privacy-first analytics service to help us improve the tool. No personally identifiable information is collected.

Sources

  1. Waist circumference and waist-hip ratio — Report of a WHO expert consultation — World Health Organization (guideline, retrieved 2026-04-28)
  2. Obesity and the risk of myocardial infarction in 27,000 participants from 52 countries — INTERHEART — Lancet (Yusuf et al., 2005) (peer reviewed, retrieved 2026-04-28)
  3. Waist circumference and waist-to-hip ratio as predictors of cardiovascular events: meta-regression — Eur Heart J (de Koning et al., 2007) (peer reviewed, retrieved 2026-04-28)