Waist-to-Hip Ratio Calculator

The waist-to-hip ratio (WHR) calculator estimates how body fat is distributed across your frame by dividing your waist circumference by your hip circumference. It is a quick, no-equipment screening tool — not a diagnosis. Two people can share the same weight and the same Body Mass Index (BMI) yet carry very different health risks depending on where that fat sits. Fat parked around the abdomen (the "apple shape", or android distribution) is visceral, metabolically active, and strongly linked to cardiovascular disease, type 2 diabetes, high blood pressure, and stroke. Fat carried on the hips and thighs (the "pear shape", or gynoid distribution) is far more benign. The World Health Organization (WHO) recognises WHR as a key indicator of central obesity, which is why this single ratio often predicts metabolic risk better than weight alone.

This tool is useful for anyone tracking general fitness, people whose BMI sits in the "normal" band but who still carry a paunch (common in South Asian body types), and those who want one number they can re-measure every few weeks to see whether lifestyle changes are working. It is a starting point for a conversation with your doctor — not a substitute for one.

The formula and the WHO risk bands

WHR = Waist circumference ÷ Hip circumference

Because it is a ratio, the units cancel out — you can measure in centimetres or inches as long as you use the same unit for both. The WHO risk thresholds differ by sex because men and women store fat differently. For men, a WHR up to 0.90 is low risk; for women, up to 0.85 is low risk. Above those ceilings, cardiovascular and metabolic risk climbs steadily — this calculator steps the bands up by roughly 0.05 into moderate, high, and very-high tiers. A complementary single-number target many clinicians prefer is the waist-to-height ratio: keeping your waist under half your height (ratio below 0.5) is a simple goal that works across ages and ethnicities.

Worked example

Take a man with a waist of 86 cm and hips of 98 cm. WHR = 86 ÷ 98 = 0.88. Because 0.88 is below the male low-risk ceiling of 0.90, he sits in the low-risk band. If his waist crept up to 95 cm while his hips stayed at 98 cm, his WHR would rise to 95 ÷ 98 = 0.97 — pushing him into the high-risk band even though, on a scale, he may have gained only a few kilograms. That jump is exactly why WHR catches risk that weight tracking can miss.

How to measure correctly and tips

• Measure your waist at the narrowest point between the lowest rib and the hip bone — usually just above the navel.
• Measure your hips at the widest point around the buttocks.
• Stand relaxed, breathe out normally (do not suck in), and keep the tape snug but not compressing the skin.
• Take each measurement twice and average them; measure at the same time of day for repeat readings.
• To improve WHR, focus on total fat loss through a modest calorie deficit, regular cardio, and resistance training — visceral fat is usually the first to go.

Common mistakes

The most frequent errors are measuring the waist at the trouser line instead of the natural waist, holding the breath in, pulling the tape too tight, and mixing units (waist in inches, hips in centimetres). Each of these distorts the ratio. A flexible, non-stretch measuring tape and a mirror (or a helper) make consistent readings much easier, and recording each result with its date lets you watch the trend rather than over-reacting to a single number. Remember too that WHR has limits: it is less reliable for pregnant women, for people with very high muscle mass, and during significant weight fluctuation. Because it is a screening tool and not a diagnostic test, treat a high reading as a prompt to investigate with a healthcare professional — alongside blood pressure, blood sugar, and cholesterol — rather than as a verdict.