Waist-to-Hip Ratio

What the Waist-to-Hip Ratio Calculator Does

This calculator turns two simple tape-measure readings into your waist-to-hip ratio (WHR), a quick indicator of how your body distributes fat. Enter your waist measurement and your hip measurement in the same unit (inches or centimeters) and the tool returns a single ratio along with a general risk category.

WHR is useful for anyone tracking body shape and health, because where you carry fat matters as much as how much you carry. Fat stored around the abdomen ('apple' shape) is more strongly linked to cardiovascular and metabolic risk than fat stored around the hips and thighs ('pear' shape). It's a handy companion to BMI, which ignores fat location entirely.

How Waist-to-Hip Ratio Is Calculated

The formula is straightforward division:

WHR = waist circumference / hip circumference

Both measurements must use the same unit, so the units cancel and the result is a unitless ratio. A smaller number means your waist is narrow relative to your hips; a number approaching or exceeding 1.0 means your waist is nearly as wide as or wider than your hips.

The World Health Organization uses these commonly cited risk thresholds:

• Women: 0.80 or below = low risk, 0.81-0.85 = moderate, above 0.85 = high.
• Men: 0.95 or below = low risk, 0.96-1.00 = moderate, above 1.00 = high.

Worked Example

Suppose a woman measures her waist at 30 inches and her hips at 40 inches.

WHR = 30 / 40 = 0.75

A ratio of 0.75 falls in the low-risk band for women (0.80 or below). For comparison, if her waist were 36 inches with the same 40-inch hips, the ratio would be 36 / 40 = 0.90, which crosses into the high-risk category. The same math works in centimeters: a man with a 94 cm waist and a 100 cm hip gets 94 / 100 = 0.94, just inside the low-risk range for men.

How to Measure Correctly

Measurement technique affects the result more than people expect, so a few centimeters of error can shift your category. Use a flexible (non-stretch) tape and keep it level all the way around.

• Waist: measure at the narrowest point, usually just above the belly button and below the rib cage.
• Hips: measure at the widest point of the buttocks.
• Stand relaxed, breathe out normally, and don't suck in your stomach.
• Keep the tape snug against the skin without compressing it, and measure over bare skin or thin clothing.

Common Mistakes and Factors That Affect WHR

The most frequent errors are mixing units (waist in inches, hips in centimeters), measuring the waist at the belt line instead of the natural narrowest point, and pulling the tape too tight. Any of these can push you into the wrong risk band.

Keep in mind that WHR thresholds differ by sex and may not apply the same way to children, pregnant people, or athletes with unusual muscle distribution. The ratio is a screening signal, not a diagnosis: a high WHR is a reason to talk with a clinician, not a conclusion on its own. For a fuller picture, pair WHR with waist circumference alone, BMI, and other health markers.