Waist to Hip Ratio Calculator

What this waist-to-hip ratio calculator does

This calculator divides your waist circumference by your hip circumference to produce a single number — the waist-to-hip ratio (WHR) — and then classifies that ratio against the World Health Organization’s cardiovascular risk bands, which differ by sex. Because WHR is a ratio of two lengths, the units cancel: it doesn’t matter whether you measure in centimetres or inches, the result is the same. The unit toggle exists purely so you can enter numbers in the system you already think in.

How to use the calculator

1. Pick your unit system — metric (cm) or imperial (in).
2. Pick sex. The WHO thresholds are different for men and women, so this selection materially changes the risk classification.
3. Enter your waist circumference and hip circumference.
4. Read the ratio (e.g. 0.85) and the risk band badge (low / moderate / high). The reference table below the result shows where you fall relative to the WHO cut-offs for your sex.
5. Tap Copy summary to put a one-line description on your clipboard if you want to log it.

How to measure correctly

WHR is only as good as the tape measurements that go into it. The two most common mistakes are picking the wrong landmark and pulling the tape too tight or too loose.

Waist: stand upright, relaxed, and exhale normally. Find the midpoint between the bottom of your lowest rib and the top of your iliac crest (the bony ridge of the pelvis). For most adults this is roughly an inch above the navel. Wrap a flexible measuring tape horizontally all the way around — front, side, back, side — keeping it parallel to the floor. The tape should be snug but not compressing the skin. Do not suck in.

Hip: place your feet together and find the widest point of your buttocks — usually around the level of the pubic bone in front and the fullest part of the glutes behind. Wrap the tape horizontally at this level.

Take each measurement twice and use the average. First thing in the morning, before eating or drinking, gives the most reproducible baseline if you want to track WHR over time.

What the WHO risk bands mean

The WHO 2008 expert consultation set the WHR cut-offs by reviewing prospective studies linking the ratio to all-cause mortality, cardiovascular events, type 2 diabetes, and metabolic syndrome.

A “high risk” badge does not mean you have heart disease — it means your body fat is preferentially distributed in a pattern that the research literature associates with substantially elevated risk of cardiovascular events and type 2 diabetes. Two people with identical BMIs can sit in very different WHR bands. The actionable takeaway is to bring this data to a clinician, who will combine it with your blood pressure, lipid panel, fasting glucose / HbA1c, smoking history, and family history to give you an overall risk estimate.

WHR vs BMI vs waist-to-height ratio

There are three commonly used anthropometric markers, and they each measure something slightly different:

• BMI (weight ÷ height²) reflects total body mass for your size but says nothing about fat distribution or muscle content.
• Waist circumference alone captures abdominal adiposity directly and is the simplest single measurement; WHO thresholds are 94 cm / 37 in for men (action level) and 80 cm / 31.5 in for women.
• Waist-to-hip ratio corrects waist for hip width — useful for separating an apple-shaped fat pattern (waist-dominant, higher risk) from a pear-shaped pattern (hip-dominant, lower risk).
• Waist-to-height ratio is the newest entrant in clinical guidelines and may be the most predictive single number; a commonly cited rule of thumb is a waist measurement below half one’s height. Specific personal targets are best discussed with a healthcare provider.

For an individual, looking at BMI plus a waist-based measurement is more informative than either alone. WHR is most useful when total weight is in a normal range but the distribution suggests visceral adiposity.

Limitations of WHR

WHR is a screening tool, not a diagnosis. It can be misleading in pregnant women (hip and waist both change), in very muscular athletes (broader gluteal musculature can lower the ratio artificially), in children and adolescents (the WHO bands were derived from adults), and in older adults whose hip circumference may shrink with age-related muscle loss. Read your WHR as one data point among several — never as a verdict.

Privacy

This calculator does its arithmetic in JavaScript on your device. There is no fetch call, no analytics on the values you enter, no server-side logging. The page works the same way offline once loaded. Your waist, hip, sex selection, and result stay on this device.