Body Measurements Check (Body Age Explained)
There is no agreed scientific formula for "body age". Instead of inventing one, this page checks three measurements that have published reference points: BMI (World Health Organization categories), waist-to-height ratio (NHS: keep your waist under half your height) and resting pulse. For adults only.
Before you start
Method : Standard measurements (BMI, waist-to-height ratio, resting pulse) compared with WHO and NHS reference points. No age is calculated.
Validation : Arithmetic checked against hand calculations. Categories are quoted from the sources; they are screening tools with known limits.
Review : not reviewed by a qualified clinician. Educational only — not a diagnosis or a medical test.
Adults only; not for children or during pregnancy.
Your answers stay in this browser tab; nothing is sent or stored.
Enter at least height and weight.
How to Use This Calculator
- Enter height and weight; waist and resting pulse are optional.
- Measure waist halfway between your lowest rib and the top of your hips, breathing out.
- Press Check.
Methodology & assumptions
- BMI = weight (kg) ÷ height (m)². WHO adult categories: under 18.5 underweight, 25+ overweight, 30+ obesity.
- Waist-to-height ratio = waist ÷ height (same units). NHS flags a waist more than half your height (ratio above 0.5).
- Resting pulse is shown as entered; above 100 bpm is flagged, following NHS advice.
Worked examples
175 cm, 70 kg, waist 80 cm: BMI = 70 ÷ 1.75² = 22.9 (healthy range); ratio = 80 ÷ 175 = 0.46 (under half your height).
165 cm, 82 kg, waist 92 cm, pulse 104: BMI = 30.1 (obesity); ratio 0.56 (more than half); pulse above 100 — worth discussing with a doctor.
Understanding your result
These are screening measures, not a diagnosis and not an age. They don't apply to children or pregnancy, and cut-offs may differ for some ethnic groups. A doctor can put them in context with blood pressure, blood tests and history.
Sources & further reading
Frequently Asked Questions
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