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Calculateur Ratio Taille

Calculez le ratio taille/taille ou taille/hanches avec les catégories de risque OMS.

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Measurements convert when you switch units

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Résultat

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La formule

Waist-to-height ratio (WHtR) = waist ÷ height. NICE and multiple health bodies use ~0.5 as an action threshold for increased cardiometabolic risk. Waist-to-hip ratio (WHR) = waist ÷ hip; WHO cutoffs: men ≥0.90 and women ≥0.85 indicate substantially increased risk.

WHtR = waist ÷ height · WHR = waist ÷ hip

Exemple détaillé

  1. Waist 85 cm, height 175 cm
  2. WHtR = 85 ÷ 175 = 0.49
  3. Category: healthy (below 0.5 action level)

Résultat: 0.49 — Healthy WHtR

Interpreting waist ratios

Central fat carries different metabolic risk than fat stored elsewhere — waist measures capture that better than weight alone.

Waist-to-height (WHtR)

A simple rule: keep waist below half your height (WHtR < 0.5). Values 0.5–0.6 suggest increased risk; above 0.6, higher obesity-related risk in screening tools.

Waist-to-hip (WHR)

WHR compares abdominal fat to hip fat. WHO classifies men with WHR ≥0.90 and women ≥0.85 as having substantially increased cardiometabolic risk.

How to measure

Stand relaxed, measure waist at midpoint between lowest rib and iliac crest (or navel level consistently). Hips at widest gluteal circumference. Tape horizontal, snug not tight.

Faits intéressants

“Keep waist to half height”

Public health campaigns (e.g. UK NICE guidance context) popularized WHtR < 0.5 as an easy screening message.

Better than BMI alone?

Waist measures add information about fat distribution — especially when BMI is normal but central fat is high (“normal-weight obesity”).

Sex differences in WHR

Women naturally store more hip/thigh fat; WHR cutoffs differ by sex in WHO guidance.

Complements body fat

Circumference ratios do not replace DEXA or Navy body fat estimates — they are quick field screens.

One measurement, two ratios

This tool supports WHtR (needs waist + height) and WHR (needs waist + hip) — pick the mode that matches your measurements.

Questions fréquentes

Many guidelines suggest WHtR below 0.5. Between 0.5 and 0.6 is often flagged as increased risk; above 0.6, higher risk.

WHO: men ≥0.90 and women ≥0.85 indicate substantially increased risk. Below those is generally lower risk in screening.

Midpoint between bottom rib and hip bone, or consistently at navel level — same spot each time matters more than which textbook point you pick.

WHtR needs only waist and height — easy to remember. WHR adds hip and sex-specific cutoffs — both screen central adiposity.

Références

  1. Waist circumference and waist-hip ratio report — World Health Organization WHR cutoffs and measurement protocol.
  2. Obesity: identification and classification — NICE (UK) WHtR context in UK clinical guidance.