The bathroom scales cannot tell you where you carry fat. Waist-to-height ratio is a simple screening measure for central adiposity—fat carried around the middle—which is associated with risks including type 2 diabetes, high blood pressure and cardiovascular disease.
NICE advises adults with a BMI below 35 to consider measuring it and gives a wonderfully simple target: try to keep your waist below half your height.
Measure it properly
Find the right point
Place the tape midway between the bottom of your ribs and the top of your hips—usually just above the belly button.
Relax and breathe out
Stand naturally. Do not pull the tape painfully tight or hold your stomach in.
Use matching units
Measure waist and height both in centimetres or both in inches. The calculator handles either.
What the result means
NICE classifies a ratio of 0.4 to 0.49 as healthy central adiposity, 0.5 to 0.59 as increased central adiposity, and 0.6 or more as high central adiposity. Those boundaries are useful prompts for action, not grades of personal success or failure.
If your waist is above half your height, the answer is not a crash diet or punishing cardio. A better starting plan usually combines a sustainable calorie deficit, protein-rich minimally processed food, resistance training and more repeatable daily movement.
Walking done consistently beats running done occasionally. Start with what you can repeat, then build.
The 2026 guidance still favours the basics
In July 2026 the UK Chief Medical Officers refreshed the national physical-activity guidance. The targets did not suddenly become extreme: the update stresses that every movement counts, that the biggest gain often comes from moving from inactivity to some activity, and that strength and balance matter throughout life.
That is good news. The effective plan is not the one that looks heroic for a fortnight; it is the one you can still follow months from now.
Read the July 2026 government update →Turn a number into a plan
A measurement is useful only if it changes what happens next. I help men over 50 estimate a realistic starting point, protect strength and muscle while losing fat, and build a plan around the time and equipment they actually have.
We will not promise an instant transformation or diagnose health conditions. We will agree the next sensible milestone, track progress and adjust the plan when real life intervenes.
Want help mapping your starting point?
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