Waist-to-height and waist-to-hip ratio are simple measures of central body fat, and complement BMI rather than replace it.
These ratios are general population screening tools, not a diagnosis — they don't account for muscle mass, frame size, pregnancy, or other individual factors. Talk to a doctor about what your numbers mean for you.
Waist-to-height thresholds: NICE guideline NG7; Ashwell & Gibson 2016; Browning et al. 2010. Waist-to-hip thresholds: WHO Expert Consultation, 2008.
Waist-to-height ratio (WHtR) is simply waist measurement divided by height, both in the same units — a single number that works across different heights better than waist size alone, since a wider waist is more concerning on a shorter person than a taller one.
Waist-to-hip ratio (WHR) instead divides waist by hip measurement, giving a sense of where body fat is distributed — higher ratios indicate more fat carried around the abdomen relative to the hips, a pattern associated with different health considerations than fat carried elsewhere.
WHtR is classified using common cutoffs of 0.40, 0.50, and 0.60, while WHR uses the World Health Organization's adult cutoffs (0.90 for men, 0.85 for women). Both measures are meant to complement BMI — giving a sense of fat distribution that BMI alone doesn't capture — rather than replace it, and neither is medical advice.
Waist-to-height compares your waist to your height, giving a distribution-independent sense of central body fat. Waist-to-hip compares your waist to your hip measurement, highlighting how your fat is distributed between your midsection and your hips.
BMI only considers height and weight, so it can't tell you where fat is carried on your body. Waist-based ratios add that distribution information, which is why health guidance often looks at ratios alongside BMI rather than either measure in isolation.
They're common reference bands used to classify waist-to-height ratio into lower, moderate, and higher-risk categories — general population guidance, not a personalized clinical assessment.
No — the WHO cutoffs used here are 0.90 for men and 0.85 for women, reflecting typical differences in body fat distribution between sexes.
