Cardiology tool
QTc Correction Calculator
Compare common QT correction formulas and frame prolonged-QTc risk more clearly.
Calculator
Type
Bedside
Use
Visible
Guardrails
Clinical Tools
Workbench layout
Calculate first, then interpret the result in context. Assumptions, limitations, and clinical guardrails stay visible beside the tool.
Bazett
470 ms
Commonly used, but tends to overcorrect at high heart rates.
Fridericia
452 ms
Often preferred when the heart rate is fast or irregular.
Framingham
451 ms
Linear correction often used for comparison in research and cardiology review.
Interpretation
Prolonged
Common adult thresholds: prolonged QTc is often considered >450 ms in men or >470 ms in women; QTc >500 ms is markedly prolonged and associated with higher torsades risk.