Free Medical Calculators & Decision Rules

Diagnose "Ease Hell", "Logic Leaks", and optimize spaced repetition settings (FSRS) for USMLE & MCAT retention. Upload .apkg files to visualize your learning efficiency.

Simulate how adjusting Desired Retention (80%–95%) changes daily review count and monthly study hours under FSRS. One-click presets for Step 1, Step 2 CK, Clerkships, and MCAT.

Calculate your exact days to clear 500–5,000+ overdue Anki reviews without burnout. Plan daily catch-up quotas and follow the descending-interval triage protocol.

Rapidly assess newborn health (Appearance, Pulse, Grimace, Activity, Respiration). Critical for OB/GYN rotations and pediatric resuscitation decisions.

Assess consciousness levels (Eye, Verbal, Motor) in trauma and stroke patients. High-yield for Emergency Medicine and Neurology decision making.

Prevent hypovolemic shock with precise fluid resuscitation calculations (4mL x kg x TBSA) for burn patients in the first 24 hours.

Stratify Pulmonary Embolism (PE) risk instantly to guide D-dimer and CTA decision making. The gold standard for ruling out PE in the ER.

Calculate 3-month mortality risk for end-stage liver disease. Key for Hepatology and Transplant medicine.

Estimate stroke risk in atrial fibrillation. Fundamental for Cardiology and Internal Medicine management.

Assess cirrhosis severity and surgical risk. Commonly tested on USMLE Step 2 CK and shelf exams.

Estimate 14-day mortality in UA/NSTEMI. A classic risk stratification tool for Cardiology rotations.

Calculate MAP to assess organ perfusion. Vital for ICU, Anesthesiology, and Critical Care monitoring.

Estimate mortality risk in community-acquired pneumonia. Guides admission decisions for Internal Medicine.

Calculate Sensitivity, Specificity, PPV, NPV. Master Biostatistics for USMLE Step 1, 2, and 3.

Calculate NNT, ARR, and RRR. Essential for understanding clinical trial data and Evidence Based Medicine.