New here? Body Baseline is a free, private health check you do at home. Five measurements become a clear picture of your body composition, the muscle, fat and ratios that track ageing more closely than the scales, so you know your starting point and what to focus on. It is educational information, not medical advice.
After 50, the scales mislead
Weight can stay constant even as muscle decreases and fat accumulates around the organs, the kind of fat that fuels inflammation. This hidden fat, unlike the fat under your skin, carries serious health risks, and the bathroom scales cannot see it.
Body Baseline gives you a clearer picture than weight alone by turning measurements you can take at home, height, weight, waist and hip, into the indicators clinicians use: body fat percentage, lean mass, waist-to-hip ratio and metabolic rate. Results show whether you sit in the healthy, borderline or elevated risk range against clinical standards for your age.
How to use it
- Take five measurements: age, height, weight, waist and hip. A tape measure and the bathroom scales are all you need. The fields are in centimetres and kilograms, and the tool catches inch-sized entries and gives you the conversion.
- Pick your activity level from six options, sedentary to highly active. Add your resting heart rate if you know it; it makes the training zones more accurate but the report works without it.
- Answer a short safety screen, seven questions.
- Read your report on screen. Copy it as text or print it to PDF to take to your GP.
No login. Nothing you enter is stored or sent anywhere; every calculation happens in your browser. The report takes about three minutes.
What you get
Percentage body fat. Calculated from the Hume formula for lean body mass, then classified against an age-stratified table with separate ranges for 40 to 49, 50 to 59 and 60 plus. Your result is shown alongside the healthy range for your age group. This is an estimate from circumference measurements, and the report says so where it applies.
Lean body mass. The weight of everything that is not fat: muscle, bone, organs, water. The number to protect as you age.
Waist-to-hip ratio. Waist divided by hip, classified against WHO female thresholds. A ratio above 0.85 sits in the elevated risk category for cardiovascular and metabolic disease, regardless of weight.
Resting metabolic rate and daily energy needs. Calculated with the Mifflin-St Jeor equation, the formula validated as most accurate for adults over 50, with your daily energy needs shown across six activity levels. Useful context before you change your diet or your exercise.
Training zones. Heart rate zones 1 to 5 by the Karvonen method when you supply a resting heart rate. Zone 1 is active recovery; zone 5 is maximum effort.
What to do next. Every report ends with the highest-leverage move for most women over 40, resistance training, and links to SLOW moves so you can build a starting point.
Where the numbers come from
Every formula and threshold comes from a peer-reviewed source, and the same calculation system produced the clinician-reviewed body composition reports we ran for iaso health program participants. When we rebuilt it as a free tool, we validated the engine against those historical participant reports before release. The report uses fixed, pre-written result text triggered by your classification. No AI-generated interpretation anywhere.
A DEXA scan remains the precise option: actual fat mass, lean mass and bone density by region, usually under $100 at Australian imaging centres with no referral needed. Body Baseline applies validated formulas to measurements you already have; it does not replace the scan, and the two work well together as a baseline and a check.
What it does not do
Body Baseline is an educational tool for establishing a baseline you can track over time. It does not diagnose anything, it does not produce a medical assessment and it is not a substitute for a DEXA scan or a consultation. If any number in your report sits outside the healthy range, the report says so and the next step is a conversation with your GP, with the report in hand.