Health Calculators
BMI, BMR, TDEE, macros, hydration, calories burned, and meal planning.
A professional Health, Nutrition & Diet suite — BMI, BMR (Mifflin-St Jeor & Harris–Benedict), TDEE, body composition (Navy body fat, LBM), calorie targets (loss / maintenance / gain), macros (P/C/F splits, presets), hydration (weight + activity + climate), micronutrients (fiber, sugar, sodium, potassium, calcium, iron), diet & meal planning (intermittent fasting, meal frequency, weekly planner), and MET-based activity calorie burn. Educational only — see medical disclaimer on every result. 100% client-side, no health data leaves your browser.
Popular
Most used in Health.
BMI Calculator
Body Mass Index (kg/m²) with WHO classification.
Healthy Weight Range
WHO healthy weight window for your height.
Ideal Weight Calculator
Devine, Robinson, Miller, Hamwi formulas.
BMR Calculator
Basal metabolic rate — Mifflin, Harris–Benedict, Katch–McArdle.
TDEE Calculator
Total daily energy expenditure — BMR × activity.
Lean Body Mass Calculator
Boer, James, and Hume LBM formulas.
Body Fat Calculator
US Navy body-fat method with reference bands.
Waist-to-Hip Ratio
WHO WHR risk banding by sex.
New
Recently added.
Daily Wellness Checklist
Educational daily wellness anchor checklist.
Healthy Habit Score
Daily healthy-habit score.
Lifestyle Wellness Score
Educational lifestyle wellness score.
Metabolic Syndrome Checklist
NCEP ATP-III educational checklist.
Cardiovascular Risk Estimator
Educational lifestyle cardiovascular checklist.
Hydration Status Estimator
Today's fluid intake vs personal target.
Caffeine Intake Calculator
Daily caffeine vs FDA/ACOG reference caps.
Alcohol Unit Calculator
UK units + US standard drinks.
All Health Calculators
151 tools available.
Baby Age Calculator
Baby age in years, months, weeks, days.
Bench Press Calculator
Bench 1RM + working percentages + strength level.
Blood Pressure Category Checker
Educational BP classification (ACC/AHA reference).
Blood Sugar Converter
mg/dL ↔ mmol/L with reference bands.
BMI Calculator
Body Mass Index (kg/m²) with WHO classification.
BMR Calculator
Basal metabolic rate — Mifflin, Harris–Benedict, Katch–McArdle.
Body Fat Calculator
US Navy body-fat method with reference bands.
Caffeine Intake Calculator
Daily caffeine vs FDA/ACOG reference caps.
Calorie Deficit Calculator
Daily deficit for a target weekly loss.
Calories Burned Calculator
MET-based kcal for 40+ activities.
Cycling Power Estimator
Approximate watts on level or graded road.
Daily Calorie Calculator
Estimate daily calories burned (TDEE).
FAQ
About Health Calculators.
Are these calculators a substitute for medical advice?
No. Every WebRul health calculator is provided for educational and informational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional for medical advice.
Is my health data uploaded or stored?
No. Every calculation runs entirely in your browser — nothing is uploaded, saved to a server, or logged. No account is required and no cookies track your inputs.
Which formulas do you use?
Peer-reviewed defaults: BMI (WHO), BMR (Mifflin-St Jeor 1990 with Harris–Benedict revised and Katch–McArdle alternatives), TDEE with standard activity factors, ideal weight (Devine, Robinson, Miller, Hamwi), lean body mass (Boer, James, Hume), body fat (US Navy circumference method), BSA (Mosteller), and WHO waist-to-hip risk banding.
Can I use metric and imperial units?
Yes. Every calculator supports both metric (cm, kg) and imperial (ft/in, lb) inputs, with results formatted in your chosen unit system.
Are these calculators safe for children or during pregnancy?
The adult reference bands (BMI, waist ratios, TDEE) do not apply to children under 18 or to pregnancy — those cases require age/sex-specific paediatric percentile charts and clinical guidance. Consult a paediatrician or obstetrician.
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