ROUNDS· clinical calculators / quick reference
Renal · Cockcroft-Gault

Creatinine Clearance

Estimates renal clearance from age, weight, sex, and serum creatinine. Commonly used for renal drug dosing.

Pharmacology · Mosteller

Body Surface Area

Used to calculate BSA-based drug dosing, most commonly for chemotherapy.

General / Metabolic

Body Mass Index

Screening measure of body fat based on height and weight.

General / Metabolic · Acid-Base

Anion Gap

Helps narrow the differential for metabolic acidosis (MUDPILES vs. non-gap causes).

General / Metabolic

Corrected Calcium

Adjusts total calcium for low albumin, which otherwise underestimates true calcium status.

Respiratory / ID

CURB-65

Severity score for community-acquired pneumonia; guides outpatient vs. inpatient management.

Confusion (new disorientation)+1
Urea > 7 mmol/L (BUN > 19 mg/dL)+1
Respiratory rate ≥ 30/min+1
BP: systolic < 90 or diastolic ≤ 60 mmHg+1
Age ≥ 65+1
Cardio / Heme

Wells Score — Pulmonary Embolism

Estimates pre-test probability of PE to guide further workup (D-dimer vs. imaging).

Clinical signs/symptoms of DVT+3.0
PE is #1 diagnosis, or equally likely+3.0
Heart rate > 100/min+1.5
Immobilization ≥3 days, or surgery in past 4 weeks+1.5
Previous, objectively diagnosed DVT/PE+1.5
Hemoptysis+1.0
Malignancy (treated within 6 mo, or palliative)+1.0
OB / Neonatal

APGAR Score

Quick assessment of a newborn's condition, typically scored at 1 and 5 minutes after birth.

Pediatrics · Holliday-Segar

Maintenance IV Fluids

Estimates pediatric maintenance fluid rate using the 4-2-1 rule.

History

Pack-Years

Quantifies smoking history for risk stratification (e.g. lung cancer screening eligibility).

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For learning and quick reference only. These calculators do not replace clinical judgment, your institution's protocols, or a licensed clinician's assessment. Always verify against your local lab reference ranges.

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