Corrected QT Interval (QTc) Calculator
Medicine & Clinical ToolsCalculate the heart-rate-corrected QT interval using Bazett formula.
Corrected QT Interval (QTc)
The heart-rate-corrected QT interval, using Bazett formula, in milliseconds.
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Odeh AhwalBased on 3 sources
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Calculator Stats
Creators
Odeh AhwalBased on 3 sources
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Saved
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Frequently Asked Questions
Why does QT interval need to be corrected for heart rate?
The raw QT interval naturally shortens at faster heart rates and lengthens at slower heart rates, so correcting for heart rate allows for a meaningful comparison of cardiac repolarization time across different heart rates.
What is a normal QTc range?
Normal QTc is commonly cited as under approximately 440 to 450 milliseconds for men and slightly higher for women, though exact reference ranges can vary by laboratory and clinical guideline.
Are there limitations to Bazett formula?
Bazett formula is known to over-correct at high heart rates and under-correct at low heart rates compared to some alternative formulas, such as Fridericia formula, though Bazett remains the most widely used in routine clinical practice.
Sources
- Corrected QT Interval (QTc) Calculator, MDCalc
- AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part IV: the ST segment, T and U waves, and the QT interval, PubMed (J Am Coll Cardiol, American Heart Association / ACCF / Heart Rhythm Society, 2009)
- Long QT Syndrome, StatPearls / NCBI Bookshelf (NIH)
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