MDCalc
MDCalc hosts evidence-based clinical calculators. Each calculator page cites the originating peer-reviewed paper and includes “Pearls/Pitfalls” written by clinician contributors. Free; account required for some advanced features.
High-frequency calculators (Med-Peds)
Adult cardiovascular
- ASCVD Risk Estimator (Pooled Cohort)
- CHA₂DS₂-VASc
- HAS-BLED
- HEART Score (Chest Pain) —
/hearton this site redirects here. - TIMI Risk Score (UA/NSTEMI)
- Wells’ Criteria for PE
- PERC Rule for PE
Respiratory / critical care
- CURB-65 Severity Score (Pneumonia)
- PSI / PORT Score (Pneumonia)
- SOFA Score
- qSOFA
- APACHE II
- Shock Index
Renal / electrolyte
- CKD-EPI 2021 (race-free) GFR
- Sodium correction in hyperglycemia (Katz)
- Free water deficit in hypernatremia
Pediatric
- Pediatric GCS (PGCS)
- Pediatric Early Warning Score (PEWS)
- PECARN Pediatric Head Injury
- Step-by-Step Approach to Febrile Infants
- Westley Croup Score
- Pediatric Appendicitis Score
- Maintenance Fluids Calculator (Holliday-Segar)
- Pediatric Endotracheal Tube Size