Free health calculators for adults over 40, built on published health guidelines. Check your metabolic age, your waist-to-height ratio and how much protein you need, and get a personal plan by email. Each tool shows its method, so you can see exactly where your number comes from.
Metabolic age calculator
Six questions on waist, movement, strength, sleep and heart rate. Get an estimated metabolic age and a personal 3-step plan.
Start the test →Waist-to-height ratio calculator
Check if your waist is healthy for your height, with your BMI, body fat estimate and target waist.
Check yours →Protein calculator
How many grams of protein you need a day for your age, weight, activity and goal, plus your target per meal.
Find your number →How our free health calculators work
Each calculator turns a few simple measurements into a number you can act on. Then it explains what the number means and gives you a short plan for your result. You see your score straight away, and an email is optional.
Metabolic age calculator
It starts from your real age and adds or subtracts years for five markers: waist size, weekly activity, strength training, sleep and resting heart rate. The thresholds come from the WHO physical activity guidelines and sleep recommendations.
Waist-to-height ratio calculator
It divides your waist by your height. A ratio under 0.5 is a widely used marker of lower risk, based on a large review of studies. It also shows your BMI and an estimate of body fat.
Protein calculator
It sets a daily protein target from your age, weight, activity and goal, following expert recommendations for older adults. In addition, it shows how much protein to aim for at each meal.
These tools are for education, not diagnosis. If a result worries you, take it to your doctor.
