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.
- Calorie deficit calculatorHow many calories to eat per day to lose weight at your pace: deficit size, rate of loss and time to your goal.
- 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.
- Ideal weight calculatorHealthy weight range by height and sex (BMI) plus the classic Devine, Robinson, Miller and Hamwi formulas.
- Daily protein intakeHow much protein per day by weight, activity and goal: maintenance, muscle gain or weight loss — in grams and per meal.
- Waist-to-height & waist-to-hipWHtR (waist/height, the 0.5 rule) and WHR (waist/hip) — abdominal fat more accurately than BMI.
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.
- HbA1c to average glucoseConvert glycated hemoglobin (HbA1c, %) into average glucose (eAG) in mmol / L with the ADAG formula.
- HOMA-IR indexInsulin resistance index from fasting glucose and insulin: norm and signs of resistance.
- De Ritis ratioAST/ALT ratio: what an enzyme imbalance suggests — liver, muscle, alcohol.
- 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.
- Transferrin saturation (TSAT)TSAT from iron and TIBC or transferrin: normal range, iron deficiency and overload.
- Mentzer indexMCV ÷ RBC: tells apart thalassemia (< 13) and iron deficiency (> 13) in microcytic anemia.
- Corrected calciumAlbumin-corrected calcium (Payne): with low albumin total calcium reads low. mmol/L and mg/dL.
- Homocysteine: normHomocysteine level assessment: optimal, borderline and hyperhomocysteinemia; links to B12, folate and vessels.
- 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.
- Lab unit converterConvert results between mmol/L and mg/dL: glucose, cholesterol, creatinine, HbA1c and more.
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.
- Baby gender by Chinese chartA fun “prediction” of the baby’s gender from the mother’s age and month of conception. Not science — 50/50.
Heart & blood pressure
Blood pressure categories by clinical thresholds and heart-rate training zones.
- Blood pressure & pulse normsBlood pressure categories by clinical thresholds, resting pulse and training zones.
- Normal pulse by ageResting pulse norm for your age (from infant to adult) and training zones with the Karvonen method.
- Cardiovascular risk (SCORE2)10-year heart attack and stroke risk by SCORE2 / SCORE2-OP: blood pressure, cholesterol, smoking — region-calibrated.
- CHA₂DS₂-VASc (stroke risk)Stroke risk in atrial fibrillation from the score points, plus annual risk and when anticoagulants are needed.
- HAS-BLED (bleeding risk)Major bleeding risk on anticoagulation from risk-factor points — the counterpart to CHA₂DS₂-VASc.
- Mean arterial pressure (MAP)Mean arterial pressure and pulse pressure from systolic and diastolic — norm and perfusion assessment.
Children & parents
WHO growth standards and blood type inheritance.
- Child’s blood typePossible blood type and Rh factor of a child from the parents’ types — with probabilities.
- Child height & weightGrowth, weight and BMI norms for children by WHO percentiles — from birth to teens.
- Child BMI by ageA child’s or teen’s BMI with the norm by age and sex — WHO percentiles and z-scores, not the adult scale.
- Newborn bilirubinTypical bilirubin norm by age in hours — a reference guide to physiological jaundice.
- Apgar scoreNewborn assessment by 5 signs (0–10): what 7/8/9/10 means and when help is needed.
- Child development by monthWhat a child can do at their age: speech, movement and social milestones (CDC/WHO) + when to see a doctor.
- Child vaccination scheduleVaccination schedule by date of birth — Russian national calendar: which vaccines and when, what’s due.
- Child paracetamol doseSingle and daily paracetamol dose by weight (10–15 mg/kg) + syrup volume in mL. A leaflet-based guide.
- Child ibuprofen doseSingle and daily ibuprofen dose by weight (5–10 mg/kg) + syrup volume in mL. A leaflet-based guide.
Lifestyle
Sleep, alcohol and biological age — honest estimates without myths.
- Sleep calculatorWhen to go to bed or wake up by sleep cycles + recommended sleep for your age.
- Daily steps by ageHow many steps you need by age (not the 10,000 myth) + conversion to kilometres and calories.
- Smoking indexPack-years (lung cancer screening threshold) and smoking index (COPD risk) from years and cigarettes per day.
- Blood alcohol calculatorYour BAC now and when the alcohol wears off — by sex, weight and drinks.
- Biological ageA biological age estimate from available lab values — compare with your passport age.
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.
- Burn areaPercent of body surface by the rule of nines (age-adjusted) + Parkland fluid resuscitation.
- MELD 3.0 / MELD-Na calculatorLiver cirrhosis severity score from bilirubin, INR, creatinine, sodium, albumin and sex (MELD 3.0) — 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.
- FIB-4 index (liver fibrosis)Non-invasive estimate of liver fibrosis from age, AST, ALT and platelets — without a biopsy.
- 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
- Fasting Insulin
- 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
- Jaundice
- Melatonin: Sleep Hormone
- Insomnia: Causes and Tests
- Dizziness: Causes
- How to Check the Liver
- ALT in Blood
- 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.