Three calculator options, three different approaches.
MdCalc
The global standard — 600+ calculators covering every specialty and clinical scenario. Well-designed interface with strong evidence references and teaching points for each calculator. The limitation for UK GPs: US-centric defaults. Some scores use American units, reference ranges, or clinical thresholds that do not translate directly to UK practice. For internationally standardised scores (Wells, CURB-65, CHA₂DS₂-VASc), MdCalc works perfectly. For UK-specific calculations (eGFR with UK creatinine assays, QOF-relevant thresholds), verify the defaults.
GPnotebook
Calculators embedded within clinical topic pages — convenient when you are already reading about a condition. The limitation: calculators are not a standalone feature. Finding a specific calculator requires navigating to the relevant topic page first, which is slower than a dedicated calculator tool.
iatroX
84+ calculators designed for UK primary care. Includes NEWS2, MELD, MELD-Na, Glasgow-Blatchford, PECARN, SOFA, Lille, APACHE II, CHA₂DS₂-VASc, QRISK-relevant inputs, AUDIT-C, PHQ-9, eGFR, and more. Two-column desktop layout with sticky editorial sidebar — designed for consultation-time use. Free.
For UK GP Trainees
iatroX covers the most commonly needed calculators with UK-appropriate context. MdCalc for niche or specialist calculators not in iatroX's library. GPnotebook for calculators encountered during clinical reference reading.
AKT Relevance
The AKT tests which calculator to apply, not which tool to use — all three give the same result for the same inputs. Know the clinical action thresholds (when to anticoagulate, when to refer, when to admit) rather than just the calculation mechanics.