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.

• MDCalc home
• Browse all calculators
• MDCalc Guidelines hub

High-frequency calculators (Med-Peds)

Adult cardiovascular

• ASCVD Risk Estimator (Pooled Cohort)
• CHA₂DS₂-VASc
• HAS-BLED
• HEART Score (Chest Pain) — /heart on 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

Hepatology / GI

• MELD-Na
• Child-Pugh Score
• Glasgow-Blatchford (Upper GI Bleed)

Decision support — what NOT to do

• Choosing Wisely lists →