Waist-to-Hip Ratio

Screening Fat Distribution From Waist and Hip Circumference

Waist-to-hip ratio (WHR) is your waist circumference divided by your hip circumference — a simple indicator of whether body fat is distributed more around the waist (“apple” shape) or the hips (“pear” shape). Enter your gender at birth, waist, and hip measurements, and this calculator shows your ratio and where it falls on a commonly-cited health-risk scale that builds on the World Health Organization’s core WHR threshold.

Where body fat is stored matters, not just how much of it there is. Fat concentrated around the waist is associated with higher health risk than the same amount of fat carried elsewhere, which is exactly what WHR is designed to flag — a measurement BMI, which only relates weight to height, can’t capture on its own.

The Formula

$$\text{WHR} = \frac{\vA{\text{Waist Circumference}}}{\vB{\text{Hip Circumference}}}$$

Both measurements use the same unit — the ratio itself is unitless, so it comes out identical whether you measure in centimeters or inches.

The result is then compared against a commonly-cited three-tier, gender-specific risk scale built on the WHO’s own core substantially-increased-risk threshold (0.90 for men, 0.85 for women):

Worked Example

A male, waist 85 cm, hip 100 cm:

1. $\text{WHR} = \vA{85} \div \vB{100} = 0.85$.
2. A ratio of 0.85 falls below the 0.90 threshold, landing in the Low Risk band for men.

Key Factors to Consider

• Fat storage patterns tend to differ naturally between men and women, which is exactly why the risk thresholds are gender-specific rather than one universal number. Men more commonly carry excess fat around the abdomen (“apple” shape), while women more commonly carry it around the hips and thighs (“pear” shape) — the separate thresholds for each sex reflect this well-documented physiological difference.
• Measuring at the correct, consistent anatomical points matters for a reliable, comparable result. Waist circumference is typically measured at the narrowest point of the torso (or the navel level), and hip circumference at the widest point around the buttocks — measuring consistently at these same points each time is more important than achieving a perfectly precise measurement on any single occasion.
• Waist-to-hip ratio and BMI measure genuinely different things, and using both together gives a fuller picture than either alone. BMI relates weight to height with no information about fat distribution, while WHR specifically captures fat distribution with no information about overall body mass — a person can have a “normal” BMI but an elevated WHR (or vice versa), which is exactly why these two measures complement rather than replace each other.
• This ratio is a screening indicator, not a diagnosis of any specific health condition. Like BMI, a waist-to-hip ratio outside the low-risk band is a signal worth discussing with a healthcare provider as part of a broader health assessment, not a standalone diagnosis of a particular disease or condition on its own.

Common Mistakes

• Swapping the waist and hip measurements. Since hip circumference is usually the larger of the two, entering the measurements in the wrong fields produces a ratio well below 1.0 that looks reassuring but doesn’t reflect reality — double-check which number went in which field.
• Measuring waist and hip at inconsistent points, or on different days under different conditions. A waist measured right after a large meal versus first thing in the morning can shift enough to change the risk category — measure both circumferences back to back, at the same points, for a result that’s actually comparable over time.
• Selecting the wrong gender at birth. The risk thresholds are genuinely different for men and women — the same ratio can fall in a different risk band depending on which set of thresholds applies.

Useful to Know

• Want a measure that doesn’t need a separate hip measurement, or one that uses the same threshold regardless of sex? Waist-to-Height Ratio Calculator only needs waist circumference and height.
• Curious how this compares against the more familiar height-and-weight-only measure? Body Mass Index (BMI) Calculator is the classic screening tool WHR is often used alongside.