Free Medical Calculators — 105 Clinical Tools

Evidence-based clinical calculators covering 22 medical specialties. Use them for exam preparation or at the bedside. Includes scoring systems, risk stratification tools, and dosing calculators.

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105
Calculators
22
Specialties
Free
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Mobile-ready
Works on all devices

105 Calculators Across 22 Specialties

Every calculator is formula-verified against the original published evidence and includes interpretation guidance — not just a raw number.

Critical Care

12 tools
  • APACHE II
  • SOFA Score
  • Glasgow Coma Scale
  • Revised Trauma Score

Cardiology

14 tools
  • CHA₂DS₂-VASc
  • GRACE Score
  • HAS-BLED
  • TIMI Risk Score

Nephrology

8 tools
  • eGFR (CKD-EPI 2021)
  • FENa
  • Creatinine Clearance
  • MDRD GFR

Pulmonology

7 tools
  • CURB-65
  • PSI/PORT Score
  • Wells PE Score
  • A-a Gradient

Gastroenterology

9 tools
  • Child-Pugh Score
  • MELD Score
  • Blatchford Score
  • Ranson Criteria

Haematology

6 tools
  • DIC Score
  • CHADS Score
  • Transfusion Requirements
  • Coagulation Indices

Neurology

8 tools
  • NIHSS
  • Hunt & Hess Scale
  • Modified Rankin Scale
  • ABCD2 Score

Obstetrics

7 tools
  • Bishop Score
  • GDM Risk Score
  • Pre-eclampsia Risk
  • Estimated Fetal Weight

Paediatrics

6 tools
  • Apgar Score
  • Paediatric GCS
  • Weight-for-age Z-score
  • Paeds Fluid Calculation

Oncology

5 tools
  • Karnofsky Scale
  • ECOG Performance
  • Neutropenia Risk
  • ANC Calculator

General Medicine

10 tools
  • BMI
  • BSA
  • IBW
  • Corrected Calcium

Surgery

8 tools
  • P-POSSUM
  • ASA Classification
  • Revised Cardiac Risk Index
  • Goldman Cardiac Risk

Most-Used Calculators

General
BMI Calculator
Calculate Body Mass Index from height and weight with WHO classification.
Nephrology
eGFR Calculator (CKD-EPI 2021)
Estimate glomerular filtration rate using the CKD-EPI 2021 equation (race-free).
Cardiology
CHA₂DS₂-VASc Score
Stroke risk stratification in non-valvular atrial fibrillation.
Respiratory
CURB-65 Score
Severity assessment for community-acquired pneumonia.
Respiratory
Wells Score for PE
Clinical probability of pulmonary embolism.
Neurology
Glasgow Coma Scale
Level of consciousness assessment — eye, verbal, motor responses.
Critical Care
SOFA Score
Sequential Organ Failure Assessment — predicts ICU mortality.
Psychiatry
PHQ-9 (Depression Screen)
Patient Health Questionnaire — depression severity screening.
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How Clinical Calculators Help Your Exam Preparation

NEET PG, INI-CET, and FMGE increasingly test clinical decision-making through scenario-based questions. Knowing when and why to use a scoring system is as important as knowing the formula. Our calculators include the clinical context, interpretation thresholds, and exam-relevant notes for each tool — not just the calculation.

For example: a question asking about stroke risk in atrial fibrillation requires understanding the CHA₂DS₂-VASc score, its components, and when anticoagulation should be initiated. Practising with the actual calculator — not just reading about it — builds the clinical automaticity that high-pressure exams reward.

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Frequently Asked Questions

Are the calculators really free?

Yes. Basic calculator access is completely free — no account required. Registered users (free tier) unlock all 105 calculators plus clinical context notes and exam-relevant tips for each tool.

How accurate are the calculators?

All formulas are verified against original published papers and validated calculators (MDCalc, ClinCalc). Interpretation ranges use current guidelines. If you find an error, please report it — accuracy is our priority.

Can I use these on my mobile?

Yes. All calculators are fully responsive and work on iOS and Android browsers. The MedNext mobile app provides offline access for all 105 tools.

Which calculators are most useful for NEET PG?

The most exam-relevant calculators are: CHA₂DS₂-VASc (Cardiology), CURB-65 (Pulmonology), MELD Score (Gastro), Glasgow Coma Scale (Neurology/Emergency), Wells Score for DVT and PE (Medicine), and Revised Cardiac Risk Index (Surgery pre-op assessment).

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