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Calcimator

EKG Interval Calculator

Analyze ECG/EKG intervals with corrected QT calculation (Bazett, Fridericia, Hodges) and interpretation of PR, QRS, and QT intervals.

Inputs

bpm
ms
ms
ms

Results

QTc (Bazett)

447 ms

QTc (Fridericia)431 ms
QTc (Hodges)426 ms
RR Interval800 ms
PR Status1
QRS Status0
QTc Status1
How to Use This Calculator
  1. Enter heart rate (bpm), PR interval (ms), QRS duration (ms), and QT interval (ms).
  2. Review QTc by Bazett, Fridericia, and Hodges formulas, RR interval, and status flags.
  3. QTc > 500 ms by any formula is critically prolonged and requires urgent clinical review.
  4. PR > 200 ms = first-degree AV block; QRS > 120 ms = bundle branch block or aberrant conduction.
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