Health Tools

Yes. Every health calculator — metabolism, heart, pregnancy, sleep, hydration and risk tools — is completely free, with no sign-up and no limits. They are provided for information and education.

Each tool uses a recognised medical formula (for example Mifflin-St Jeor for BMR, or standard BMI and body-fat equations), and many show several methods so you can compare. Results are reliable estimates based on what you enter, but they are population averages, so your individual situation may differ.

No. The calculators are for general information and education only. They do not diagnose, treat or replace advice from a doctor or qualified health professional. Always consult a professional before making health decisions — see our Disclaimer for details.

It is private. Everything is calculated in your browser, so the measurements you enter — weight, cycle dates, blood pressure and so on — are never uploaded to a server or saved. When you close the tab, the data is gone.

Use the BMR/TDEE, ideal weight and body-fat tools for weight and metabolism; the heart rate, blood pressure and cholesterol tools for cardiovascular health; the due-date, ovulation and period tools for pregnancy and cycles; and the sleep, water and diabetes-risk tools for daily wellbeing. The cards above group them by area.

Use the BMR calculator: enter your age, sex, height and weight to get your basal metabolic rate, then apply your activity level for your TDEE (total daily calories). Eat below it to lose weight and above it to gain — gradually, and ideally with professional guidance for big changes.

BMI compares weight to height; body fat is estimated from measurements like waist and neck using validated formulas; and ideal weight uses established equations such as Devine and Robinson. Each is a useful indicator, but none captures muscle, frame or overall health on its own — use them together.

The due date is estimated from your last period using the standard 280-day method, and ovulation from your average cycle length. Both are good estimates, but cycles and pregnancies vary, so treat them as a guide and confirm important dates with your doctor or a scan.

You can, but the predictions are less precise with irregular cycles because they assume a consistent length. Enter your average and treat the fertile window or period dates as an approximate range rather than a fixed day.

The formulas are designed for adults and are most accurate within typical ranges. Results may be less reliable for children, athletes with high muscle mass, pregnant women or older adults, where a professional assessment is more appropriate.

If a result falls outside a healthy range — such as high blood pressure, a high diabetes-risk score or an unhealthy cholesterol ratio — treat it as a prompt to speak with a doctor, not a diagnosis. The tools flag areas to look into; a professional interprets them.

No. There is no registration or login. Open any calculator and use it immediately — no email or personal details are collected.

Yes. Every tool is mobile-first and works in any browser on Android and iPhone, tablets and desktops, so you can check a number anywhere.

Yes. The calculators use widely accepted equations and guidelines — Mifflin-St Jeor and Harris-Benedict for metabolism, WHO BMI categories, standard blood-pressure ranges, and established due-date and body-fat formulas — with the method shown so you can see how each result is derived.

General guidance is around 2-3 litres of water a day and 7-9 hours of sleep for most adults, but both depend on your age, activity, climate and health. The Water Intake and Sleep calculators tailor an estimate to you, including sleep-cycle-based wake times.