Awesome Medical Tools

A curated list of free medical calculators, clinical decision support tools, and healthcare resources for medical professionals and students.

Contents

• Clinical Calculator Suites
• Individual Calculators
• Drug Reference & Dosing
• Lab Reference
• Medical Education
• Open Source Projects
• Mobile Apps
• APIs & Data

Clinical Calculator Suites

Complete platforms with multiple clinical calculators.

• MDTools.org - 100+ free clinical calculators and lab references. No sign-up, no ads. Available in English and German. Open source on GitHub.
• MDCalc - Large collection of clinical calculators with evidence-based content.
• ClinCalc - Clinical calculators focused on pharmacy and drug dosing.
• MedCalc 3000 - Web-based medical calculator collection.
• ARUP Lab Test Interpretation - Lab test reference with clinical interpretation.

Individual Calculators

Nephrology

• eGFR Calculator (CKD-EPI 2021) - Race-free eGFR estimation using the latest CKD-EPI equation.
• Creatinine Clearance - Cockcroft-Gault equation for drug dosing adjustments.
• FENa Calculator - Fractional excretion of sodium for AKI differentiation.
• Free Water Deficit - Calculate water replacement in hypernatremia.
• Sodium Correction - Corrected sodium for hyperglycemia.

Cardiology

• CHA₂DS₂-VASc Score - Stroke risk in atrial fibrillation.
• HEART Score - Chest pain risk stratification in the ED.
• ASCVD Risk Calculator - 10-year atherosclerotic cardiovascular disease risk.
• QTc Calculator - Corrected QT interval (Bazett, Fridericia, Framingham).
• HAS-BLED Score - Bleeding risk in anticoagulation.

Hepatology & GI

• MELD Score - Liver disease severity and transplant priority.
• Child-Pugh Score - Cirrhosis prognosis classification.
• FIB-4 Index - Non-invasive liver fibrosis assessment.

Pulmonology

• A-a Gradient - Alveolar-arterial oxygen gradient.
• Wells Score (PE) - Pulmonary embolism probability.
• Wells Score (DVT) - Deep vein thrombosis probability.
• CURB-65 - Pneumonia severity and disposition.
• ABG Interpreter - Arterial blood gas analysis.

Neurology

• Glasgow Coma Scale - Consciousness level assessment.
• NIH Stroke Scale - Stroke severity scoring.
• Canadian CT Head Rule - Minor head injury imaging decision.

Critical Care

• SOFA Score - Sequential Organ Failure Assessment.
• Parkland Formula - Burn resuscitation fluid calculation.
• Braden Scale - Pressure injury risk assessment.

General

• BMI Calculator - Body mass index with WHO categories.
• BSA Calculator - Body surface area (Mosteller, DuBois).
• A1C Calculator - A1C to average glucose conversion.
• Corrected Calcium - Albumin-adjusted calcium.
• Anion Gap - Metabolic acidosis workup.

Drug Reference & Dosing

• Vancomycin AUC Calculator - AUC-based vancomycin dosing.
• Heparin Dosing - Weight-based heparin protocol.
• Warfarin Dosing - INR-based warfarin management.
• Semaglutide Dosing - GLP-1 RA titration schedule.
• Insulin Dose Calculator - Basal-bolus insulin dosing.
• Ketamine Dosing - Procedural sedation dosing.
• Lidocaine Dose - Max local anesthetic dose.
• Opioid Conversion - Morphine milligram equivalents.
• Infant Acetaminophen Dosing - Pediatric weight-based dosing.
• Infant Ibuprofen Dosing - Pediatric weight-based dosing.
• Amoxicillin Pediatric Dosing - Standard and high-dose protocols.
• Epocrates - Drug reference and interaction checker.
• Lexicomp - Comprehensive drug information.

Lab Reference

Normal ranges, clinical significance, and interpretation guides.

• Sodium Normal Range - Hypo/hypernatremia causes and interpretation.
• Potassium Normal Range - Hypo/hyperkalemia evaluation.
• Creatinine Normal Range - Renal function marker reference.
• BNP Normal Range - Heart failure biomarker interpretation.
• CRP Normal Range - Inflammatory marker reference.
• Calcium Normal Range - Hypo/hypercalcemia workup.
• Albumin Normal Range - Nutritional and liver function marker.
• Bilirubin Normal Range - Hepatic function reference.
• ALP Normal Range - Alkaline phosphatase interpretation.
• Chloride Normal Range - Electrolyte reference.

Medical Education

• UpToDate - Evidence-based clinical decision support (subscription).
• AMBOSS - Medical knowledge platform for students and clinicians.
• Radiopaedia - Free radiology reference and education.
• Life in the Fast Lane (LITFL) - Emergency medicine and critical care education.
• EMCrit - Emergency medicine and critical care podcast and blog.
• Teach Me Medicine - Free medical education resource.

Open Source Projects

• mdtools - MDTools.org website source code.
• medical-calculator-formulas - Open-source JavaScript implementations of medical formulas.
• OpenMRS - Open-source medical record system.
• HAPI FHIR - Open-source FHIR server implementation.
• SMART on FHIR - Standards-based health apps.

Mobile Apps

• MDTools - PWA, works on any mobile browser. Free.
• MDCalc - iOS/Android medical calculator app.
• Medscape - Drug reference and medical news.
• UpToDate - Clinical reference (subscription required).

APIs & Data

• OpenFDA - FDA drug, device, and food data APIs.
• PubMed API - NCBI E-utilities for literature search.
• RxNorm API - Drug naming and coding system.
• LOINC - Lab test codes and standards.

Contributing

Your contributions are welcome! Please read the contribution guidelines first.

Found a broken link or want to add a resource? Open an issue.

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Maintained by MDTools.org — Free clinical tools for healthcare professionals.

Pharmacy Tools

Tools for pharmacists and pharmacy students.

• Prescription Refill Calculator - Calculate refill dates based on fill date, day supply, and pickup window.
• Day Supply Calculator - Calculate days supply from quantity, dose, and frequency.
• Medication Timing Calculator - Calculate optimal medication timing for multi-dose regimens.
• Prescription Quantity Calculator - Calculate quantity needed for a given days supply.
• Pill Count Calculator - Verify dispensed quantities against expected counts.
• Prescription Duration Calculator - Calculate how long a prescription will last.
• Opioid MME Converter - Morphine milligram equivalent calculations.

Psychiatry & Mental Health

Screening tools and scoring systems for psychiatric assessment.

• PHQ-9 Depression Screen - Patient Health Questionnaire-9 for depression severity.
• GAD-7 Anxiety Screen - Generalized Anxiety Disorder 7-item scale.
• CIWA-Ar Score - Clinical Institute Withdrawal Assessment for alcohol withdrawal.
• RASS Score - Richmond Agitation-Sedation Scale for ICU patients.
• CAM-ICU - Confusion Assessment Method for the ICU.

Body Composition & Nutrition

• BMI Calculator - Body Mass Index with WHO classification.
• Reverse BMI Calculator - Calculate target weight for a desired BMI.
• Amputee BMI Calculator - Adjusted BMI for amputees.
• Body Fat Calculator - Estimate body fat percentage.
• TDEE Calculator - Total Daily Energy Expenditure.
• BSA Calculator - Body Surface Area (Mosteller, DuBois, Haycock).
• IBW Calculator - Ideal Body Weight (Devine formula).
• Maintenance Fluids - Holliday-Segar method (4-2-1 rule).