NHS & clinically referenced

Body Health Check

Height and weight gets you a BMI. Add your waist for a better risk picture. Add neck (and hip) to unlock a body fat estimate.

For adults only · Estimates only — not diagnostic
⚧ Biological sex
Used for body fat formula only. Required if entering neck measurement.
📏 Height
cm
/
ft
⚖️ Weight
kg
/
st
📐 Waist
Optional
↳ Unlocks waist-to-height ratio (NICE / NHS recommended)
Measure at the narrowest point of your abdomen, roughly halfway between your lowest rib and your hip bone. Breathe out normally before measuring.
cm
/
in
🔵 Neck
Optional
↳ Unlocks body fat % estimate (US Navy method, ±3–4%)
Measure just below your larynx (Adam's apple), keeping the tape horizontal.
cm
/
in
🔵 Hip
Female only
Measure at the widest part of your hips/buttocks, keeping the tape horizontal.
cm
/
in

Please enter at least height and weight to continue.

Guidance & Sources

NHS
BMI — what your result means
nhs.uk — healthy weight guidance
↗
NICE
Waist-to-height ratio guidance
NICE — obesity assessment in adults
↗
BHF
Healthy weight & heart health
British Heart Foundation
↗
NHS
Managing your weight
nhs.uk — support & next steps
↗
⚠️

Not medical advice. BMI and body fat estimates are screening tools, not diagnostic measures. They do not account for muscle mass, bone density, ethnicity, or individual health history. The body fat estimate uses the US Navy circumference method (±3–4% accuracy). If you are concerned about your weight or body composition, speak to your GP or call NHS 111.