Clinical Toolkit · Free
Every calculator you need, always on you.
Evidence-based clinical calculators for medical students and practitioners. Free, fast, no login required.
Cardiovascular
Mean Arterial Pressure (MAP)
Calculate mean arterial pressure from systolic and diastolic blood pressure.
QTc Interval (Bazett)
Correct the QT interval for heart rate using the Bazett formula to assess TdP risk.
CHA₂DS₂-VASc Score
Estimate stroke risk in non-valvular atrial fibrillation to guide anticoagulation.
HAS-BLED Bleeding Risk Score
Estimate major bleeding risk in AF patients on anticoagulation.
HEART Score
Risk-stratify chest pain patients in the ED for major adverse cardiac events (MACE).
Framingham 10-Year CVD Risk
Estimate 10-year cardiovascular disease risk using the simplified Framingham points-based model.
Wells DVT Score
Pre-test probability of deep vein thrombosis to guide D-dimer testing and imaging.
Wells PE Score
Pre-test probability of pulmonary embolism to guide D-dimer and CT-PA decision.
Caprini VTE Risk Score
Assess VTE risk in surgical patients to guide prophylaxis decisions.
Revised Cardiac Risk Index (RCRI)
Estimate perioperative major adverse cardiac event (MACE) risk before non-cardiac surgery.
Renal Function
Creatinine Clearance (Cockcroft-Gault)
Estimate creatinine clearance for drug dosing and CKD staging using Cockcroft-Gault.
CKD-EPI GFR (2021)
Estimate GFR using the 2021 race-free CKD-EPI creatinine equation for CKD staging.
MDRD GFR (4-Variable)
Estimate GFR using the 4-variable MDRD equation — widely reported by Indian labs.
Fractional Excretion of Sodium (FENa)
Distinguish prerenal from intrinsic renal AKI using the fractional excretion of sodium.
Hepatic Function
Laboratory & Electrolytes
Anion Gap (with Albumin Correction)
Calculate anion gap and albumin-corrected anion gap for acid-base analysis.
Corrected Calcium (for Albumin)
Correct serum calcium for hypoalbuminaemia to identify true hypercalcaemia or hypocalcaemia.
Corrected Sodium for Hyperglycaemia
Correct serum sodium for hyperglycaemia-induced dilutional hyponatraemia (e.g., DKA, HHS).
Serum Osmolality
Calculate estimated serum osmolality and osmol gap to detect unmeasured osmoles.
LDL Cholesterol (Friedewald)
Calculate LDL cholesterol using the Friedewald equation from a standard lipid panel.
HOMA-IR (Insulin Resistance)
Estimate insulin resistance using fasting glucose and insulin (Homeostatic Model Assessment).
Free Water Deficit
Calculate free water deficit in hypernatraemia to guide safe rehydration therapy.
Critical Care
SOFA Score
Sequential Organ Failure Assessment — estimates ICU mortality based on 6 organ systems.
Glasgow Coma Scale
Standardised neurological assessment of consciousness — Eye, Verbal, Motor response.
SIRS Criteria
Systemic Inflammatory Response Syndrome — ≥2 criteria define SIRS.
APACHE II Score
Acute Physiology and Chronic Health Evaluation II — ICU mortality prediction from 12 physiological variables.
Glasgow-Blatchford Score
Pre-endoscopy risk stratification for upper GI bleeding.
Charlson Comorbidity Index
Predicts 10-year mortality based on 19 comorbid conditions plus age.
Respiratory
CURB-65
Community-acquired pneumonia severity score — guides admission vs outpatient decision.
Pneumonia Severity Index (PORT)
Fine et al. risk classification for CAP — 20-variable score predicting 30-day mortality.
PERC Rule
Pulmonary Embolism Rule-out Criteria — 8-item rule to exclude PE without testing.
Infection
Fluids & Medications
Maintenance Fluid Calculator
Calculates daily and hourly maintenance fluid requirements using the Holliday-Segar method.
Steroid Conversion Calculator
Converts between equivalent anti-inflammatory doses of corticosteroids.
Morphine Milligram Equivalent (MME)
Calculates daily opioid dose in morphine equivalents for safety monitoring.
Obstetrics