Is WHtR better than BMI?

For predicting cardiometabolic risk in adults, yes — most studies show WHtR outperforms BMI.

Is 0.5 the goal for everyone?

Roughly. For ages 6–40 the target is < 0.5; people over 40 may stretch slightly above without elevated risk.

Why measure at the navel?

It’s reproducible across people. The narrowest waist varies anatomically, so the navel-level measurement is more standardised.

Will losing belly fat improve heart health?

Yes — visceral fat is metabolically active and a key driver of insulin resistance and inflammation.

How fast can WHtR change?

Small but real movement is possible in 4–8 weeks with sustained diet and exercise changes.

Body measurements · Cardiometabolic

Waist to Height Calculator

Q: Why measure at the navel?

It’s reproducible across people. The narrowest waist varies anatomically, so the navel-level measurement is more standardised.

Q: Will losing belly fat improve heart health?

Yes — visceral fat is metabolically active and a key driver of insulin resistance and inflammation.

Q: How fast can WHtR change?

Small but real movement is possible in 4–8 weeks with sustained diet and exercise changes.

A modern marker of cardiometabolic risk.

Your measurements

WaistAt the level of the navel

Height

Stand relaxed, exhale, measure without pulling in. Average three measurements for precision.

Your ratio

0.47

0.300.80+

Healthy

Within the cardiometabolically healthy range.

Why WHtR is more useful than BMI alone

BMI doesn’t distinguish where fat sits on the body. Waist-to-Height Ratio (WHtR) zeroes in on central adiposity — the strongest single predictor of cardiometabolic risk in most adults.

The "keep your waist to less than half your height" rule

A WHtR below 0.5 is the simple, widely-cited target. The Ashwell shape chart formalises this — the same rule applies across ethnicities, sex and age.

How to measure waist correctly

Stand relaxed, exhale gently, and measure at the level of the navel — not the narrowest point. Don’t pull in. Average three measurements for stability.

Category reference

Category	Range	What it means
Slim	< 0.40	Possibly under-nourished — confirm with a clinician.
Healthy	< 0.50	Within the cardiometabolically healthy range.
Increased risk	< 0.60	Increased cardiometabolic risk — consider lifestyle adjustments.
High risk	≥ 0.60	High cardiometabolic risk — clinician input recommended.