Is waist circumference alone enough?

Often yes — WHO uses ≥102 cm (men) / ≥88 cm (women) waist as a standalone risk threshold. WHR adds context for people with very narrow or very wide hip frames.

Below ~0.7 for women is uncommon and usually fine. Below 0.85 for men is unusual and may suggest underweight; check with a doctor.

How often should I re-measure?

Monthly is plenty for tracking. Daily fluctuations from food, hydration, and bloating can shift waist measurements ±1–2 cm and obscure trend changes.

Where exactly do I put the tape?

WHO protocol: waist at the midpoint between the lowest rib and iliac crest (top of hip bone), hips at the widest point of the buttocks. Many people find the navel close enough to the WHO waist site.

Waist-Hip Ratio Calculator — embedded

Q: Why is WHR a better predictor than BMI?

BMI doesn't distinguish where fat sits. Visceral fat (around organs, near the waist) is metabolically active and dangerous. Subcutaneous fat (especially on hips/thighs) is less risky. WHR captures this distribution.

Result

Waist-Hip Ratio

0.89

Healthy

Low risk

Cardiovascular riskLow riskHealthy
WHO waist threshold✅ within healthy range102 cm (40.2 in) for male
Healthy WHR target< 0.95

Low risk

0.6 WHR0.89 WHR1.2 WHR

WHO male thresholds: low <0.95, moderate 0.95-1, high >1.

Source: WHO Expert Consultation on Waist Circumference and Waist–Hip Ratio (2008).

Not medical advice — WHR is a screening indicator, not a diagnosis. Pregnancy invalidates WHR as a cardiovascular indicator. Some authorities use lower cutoffs for South Asian populations. Discuss readings near or above the threshold with a clinician.

How to use this calculator

Measure waist at the narrowest point (typically just above the navel), tape parallel to the floor, relaxed.
Measure hips at the widest point of the buttocks.
Take both measurements in the morning, before eating.
Use the same units for both (mixing units gives wrong ratio).

About this tool

Where you carry fat matters as much as how much you carry. Waist-hip ratio (WHR) is one of the simplest indicators of central (visceral) obesity, which is more strongly linked to heart disease, type 2 diabetes, and metabolic syndrome than overall fat. WHO thresholds: men should aim for <0.95, women <0.80. Above 1.0 (men) or 0.85 (women) is considered substantially elevated risk. Pair WHR with BMI for a fuller picture: someone with normal BMI but high WHR ("skinny fat") still carries elevated risk.

How it works — the formula

WHR = waist circumference ÷ hip circumference

Both measurements must be in the same unit (the ratio is dimensionless). The WHO classifies abdominal obesity as WHR ≥ 0.90 in men and ≥ 0.85 in women, regardless of BMI; these thresholds correlate with substantially higher cardiometabolic risk in pooled prospective cohorts.

Sources: WHO — Waist circumference and waist–hip ratio: Report of a WHO Expert Consultation, 2008 · NIH NHLBI — Aim for a Healthy Weight: Assessing Your Risk

Worked examples

Example 1

Adult male, low risk

Inputs:: waist = 85 cm, hip = 100 cm
Output:: WHR = 0.85 → Below WHO male threshold (0.90)

Example 2

Adult female, elevated risk

Inputs:: waist = 90 cm, hip = 100 cm
Output:: WHR = 0.90 → Above WHO female threshold (0.85) — substantially increased risk

Example 3

Mixed-units check (use same unit!)

Inputs:: waist = 36 in, hip = 40 in
Output:: WHR = 0.90 — same answer either unit, because ratio cancels out

Limitations

WHR cannot tell you total body composition — only fat distribution.
Pregnancy temporarily invalidates WHR as a cardiovascular indicator.
Sex-specific thresholds were calibrated mostly on European populations; some health authorities use lower cutoffs for South Asian populations.
WHR alone misses central obesity in lean-but-skinny-fat individuals — pair with body-fat % when possible.

WHR is a screening indicator, not a diagnosis. This calculator does not provide medical advice — discuss your readings with a clinician if you sit near or above the threshold.

Frequently asked

BMI doesn't distinguish where fat sits. Visceral fat (around organs, near the waist) is metabolically active and dangerous. Subcutaneous fat (especially on hips/thighs) is less risky. WHR captures this distribution.