Health calculators
Free online health calculators and reference ranges: check the essentials in seconds — clearly, with an explanation of what your result means.
Body & nutrition
Weight, calories, water and body composition — the basis for clear goals.
- BMI calculatorBody mass index from height and weight: is your weight normal, and your healthy range.
- Calorie & macro calculatorDaily calorie needs (BMR and TDEE) and macros for your goal — losing, maintaining or gaining.
- Daily water intakeHow much water to drink per day: by weight, activity and climate — in litres and glasses.
- Body fat percentageBody fat estimate from measurements (US Navy method) and lean body mass.
Lab test norms
Enter a value from your lab report — see whether it is normal and what it means.
- Cholesterol normsTotal cholesterol, LDL, HDL and triglycerides by age and sex + atherogenic index.
- Hemoglobin normsNormal ranges for women, men and children by age: check your lab value.
- Blood sugar normsGlucose and HbA1c: norms by age, HbA1c ↔ average glucose, HOMA-IR.
- eGFR calculatorGlomerular filtration rate from creatinine (CKD-EPI 2021) and kidney function stage.
- Blood iron normsIron, ferritin and transferrin saturation: normal ranges by sex and age.
- Vitamin D: 25(OH)D levelDeficiency, insufficiency or normal — by your 25(OH)D level, with unit conversion.
- Osteoporosis fracture risk10-year fracture risk from age, sex and DXA T-score — the validated Garvan model.
- Creatinine clearanceCockcroft–Gault clearance for drug dosing, with an ideal body weight correction.
Pregnancy & cycle
Due date, weeks and fertile days — by clear obstetric rules.
- Pregnancy calculatorGestational age week by week and estimated due date from your last period.
- Ovulation calculatorLikely ovulation day and fertile window from your cycle length.
- hCG by weekβ-hCG norm by gestational week, value check and growth dynamics (doubling time).
- IVF calculatorPregnancy term and due date from the embryo transfer date (day 3 or 5).
- OGTT in pregnancy75g glucose tolerance test interpretation and gestational diabetes by WHO criteria.
Heart & blood pressure
Blood pressure categories by clinical thresholds and heart-rate training zones.
Children & parents
WHO growth standards and blood type inheritance.
Lifestyle
Sleep, alcohol and biological age — honest estimates without myths.
Clinical scores & formulas
Clinical scores and calculations from published formulas — for clinicians and understanding.
- Glasgow Coma Scale (GCS)Eye, verbal and motor score (3–15) and the level of impaired consciousness.
- MELD / MELD-Na calculatorLiver cirrhosis severity score from bilirubin, INR, creatinine and sodium — with a prognosis guide.
- Child-Pugh calculatorCirrhosis class A/B/C from bilirubin, albumin, INR, ascites and encephalopathy — with prognosis.
- Body surface area (BSA)BSA from height and weight (Mosteller, Du Bois) — for chemo dosing and cardiac index.
- Serum osmolalityPlasma osmolality from sodium, glucose and urea, checked against 275–295.
- Charlson indexComorbidity index from conditions and age with a 10-year survival estimate.
- Wells score (PE/DVT)Clinical probability of pulmonary embolism and deep vein thrombosis by points.
Pets
Your cat’s or dog’s age in human years — without the “multiply by 7” myth.
A calculator shows one value — the full picture is in your labs
Upload a photo or PDF of your lab report — AI explains every value, connects them together and tells you what to do next.
Useful articles
Deep dives people most often read after checking their numbers — one for every calculator topic.
- Obesity Guide
- Daily Calorie Intake
- How to Lower Blood Sugar
- Glycated Haemoglobin HbA1c
- Insulin Resistance
- High Cholesterol
- Extended Lipid Panel
- How to Increase Haemoglobin
- Iron Deficiency Anemia
- Ferritin Blood Test
- Chronic Kidney Disease
- Creatinine in Blood
- Arterial Hypertension
- Pregnancy Week by Week
- First Signs of Pregnancy
- What Is Ovulation
- Child Blood Test Norms
- Melatonin: Sleep Hormone
- Insomnia: Causes and Tests
- Dizziness: Causes
- How to Check the Liver
- Vitamin D Deficiency
- Osteoporosis
- Biological Age
- How to Live Long
- Cat Blood Test
- Dog Blood Test
These calculators and norm tables are for reference and information: they help you understand a value and prepare for a doctor’s visit. They are not a diagnosis or a treatment prescription — the final assessment is up to your doctor.