Question 1

What is a Corrected QT Calculator?

Accepted Answer

QTc normalises the QT interval for heart rate. Prolonged QTc (>450ms men, >470ms women) signals risk of torsades de pointes, a potentially fatal arrhythmia.

Question 2

How does the Corrected QT Calculator work?

Accepted Answer

Bazett: QTc = QT / √RR (RR in seconds) Then: Fridericia: QTc = QT / RR^(1/3) — more accurate Then: RR (sec) = 60 / HR (bpm) Then: Critical: QTc > 500ms requires urgent review.

Question 3

Can you give an example of how to use the Corrected QT Calculator?

Accepted Answer

Example: Input QT = 380ms, HR = 60 bpm (RR = 1.0s) gives a result of QTc (Bazett) = 380ms — Normal.

Question 4

Is the Corrected QT Calculator free to use?

Accepted Answer

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

Question 5

How accurate is the Corrected QT Calculator?

Accepted Answer

Our Corrected QT Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

QTc	Men	Women
Normal	< 440ms	< 450ms
Borderline	440–470ms	450–480ms
Prolonged	> 470ms	> 480ms
Critical	> 500ms	> 500ms

Corrected QT Calculator

Corrected QT Interval (QTc)

What is Corrected QT Calculator?

How to Use Corrected QT Calculator

Example Corrected QT Calculator

QTc Interpretation

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