Free Health Calculators

BMI, calories, clinical scores, and dosing tools — all run locally in your browser with no signup.

Wellness metrics like BMI, BMR, TDEE, and water intake
Clinical helpers including GFR, QTc, and risk scores
Clear guides and FAQs under every tool

30 tools in this category

BMI Calculator

Body mass index and weight category

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BMR Calculator

Basal metabolic rate (Mifflin-St Jeor formula)

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TDEE Calculator

Daily calorie needs based on activity level

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Calorie Deficit

Time to reach target weight

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Ideal Weight

Devine formula estimate

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Body Fat % (Navy)

US Navy circumference method

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Macro Calculator

Protein, fat, and carbs from calories

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Heart Rate Zones

Training heart rate zones

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Blood Alcohol Calculator

Estimated blood alcohol concentration

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Due Date

Estimated due date from last menstrual period

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Sleep Cycle Calculator

Optimal wake times based on sleep cycles

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Waist-to-Hip Ratio

WHR index and risk assessment

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Body Surface Area

Mosteller formula (m²)

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Calorie Burn

Calories burned by MET and duration

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Blood Pressure

Blood pressure category

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GFR (CKD-EPI 2021)

Estimated glomerular filtration rate from creatinine

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Creatinine Clearance

Cockcroft-Gault formula

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BSA-Based Dose

Drug dose based on body surface area

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mg/kg Dose

Total dose = dose per kg × body weight

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Pediatric Dose

Young's and Clark's rules from adult dose

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Corrected QT (QTc)

QTc by Bazett: QT / √RR

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Anion Gap

AG = Na − (Cl + HCO₃)

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Mean Arterial Pressure (MAP)

MAP = DBP + (SBP−DBP)/3

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Maintenance Fluids

Holliday-Segar: mL/day by weight

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Parkland Formula

Burn resuscitation: 4 mL × kg × %TBSA

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CHA₂DS₂-VASc

Stroke risk in atrial fibrillation

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Wells DVT

Deep vein thrombosis probability

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Glasgow Coma Scale

GCS: eye + verbal + motor response

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Ideal Body Weight (Devine)

For dosing calculations (aminoglycosides, etc.)

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Water Intake Calculator

Daily water needs from body weight and activity

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