Waist-to-height ratio calculator
A more accurate picture of metabolic health than BMI — especially after 40.
Your waist-to-height ratio
Takes 30 seconds. Tells you more than BMI ever could.
How to measure your waist correctly
- Stand upright, relaxed — don't suck in your stomach.
- Find the midpoint between your lowest rib and the top of your hip bone (iliac crest). This is typically just above your navel.
- Wrap a soft tape measure around your bare skin at that midpoint — keep it horizontal and snug, not tight.
- Breathe out gently and take the reading. Don't hold your breath.
- Measure twice and average the two readings.
BMI can't distinguish muscle from fat. A strength-trained 55-year-old can show an "overweight" BMI while being metabolically healthy. Waist-to-height ratio specifically measures central adiposity — the visceral fat around your organs — which is the type most strongly linked to cardiovascular disease, type 2 diabetes, and metabolic syndrome. Research published in PLOS ONE found WHtR to be a better predictor of cardiometabolic risk than BMI across all age groups.[1]
What your ratio means
The core principle is simple: keep your waist to less than half your height. That single threshold — a ratio below 0.5 — has been validated across multiple ethnicities and age groups as a reliable indicator of healthy central body fat distribution.
Below 0.5 — Healthy range
Your waist circumference is less than half your height. Research consistently associates this range with lower risk of cardiovascular disease, type 2 diabetes and metabolic syndrome. After 40, maintaining this range becomes progressively more important as visceral fat accumulation accelerates.
0.5 to 0.59 — Increased risk
Your waist is between half and 60% of your height. This range indicates elevated central adiposity. It doesn't mean you're unhealthy, but it does suggest your nutrition, activity or sleep may need attention. Even modest reductions in waist circumference in this range have measurable effects on metabolic markers.
0.6 and above — High risk
A ratio of 0.6 or above is associated with significantly elevated cardiometabolic risk. At this level, a conversation with your GP is worthwhile — not because something is definitely wrong, but because the data warrants professional assessment. Nutrition and exercise changes at this range can produce rapid improvements in metabolic health markers.
How to improve your waist-to-height ratio after 40
Three levers move this number most effectively after 40:
Protein and resistance training together. Muscle tissue burns more calories at rest than fat tissue. Adding lean muscle mass while in a modest caloric deficit is the most effective strategy for reducing visceral fat specifically. This is why our macro calculator sets protein targets at 1.6g/kg — high enough to support muscle preservation during fat loss.
Sleep quality. Consistently sleeping fewer than seven hours is associated with increased cortisol, which drives visceral fat accumulation specifically. You can eat perfectly and train hard and still see your waist expand if sleep is poor.
Reducing refined carbohydrates and alcohol. Both drive liver fat accumulation, which contributes directly to the visceral fat measured by your waist circumference. You don't need to eliminate either — but reducing frequency and quantity has a disproportionate effect on waist-to-height ratio specifically.
Ready to fix your macros too?
Your waist-to-height ratio improves fastest when your nutrition is dialled in. Get your personalised calorie and macro targets in 30 seconds.
Calculate My Macros →Scientific References
- Ashwell, M., Gunn, P., Gibson, S. (2012). "Waist-to-height ratio is a better screening tool than waist circumference and BMI for adult cardiometabolic risk factors." PLOS ONE. journals.plos.org
- Browning, L.M., Hsieh, S.D., Ashwell, M. (2010). "A systematic review of waist-to-height ratio as a screening tool for the prediction of cardiovascular disease and diabetes." Nutrition Research Reviews. pubmed.ncbi.nlm.nih.gov
- Savva, S.C. et al. (2000). "Waist circumference and waist-to-height ratio are better predictors of cardiovascular disease risk factors in children than body mass index." International Journal of Obesity. pubmed.ncbi.nlm.nih.gov
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