Online QTC Calculator

Calculate corrected QT interval (QTc) using multiple formulas with heart rate, QT interval, age, and sex inputs.

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About This Tool

This QTc calculator computes the corrected QT interval using four standard formulas: Bazett, Fridericia, Framingham, and Hodges. The corrected QT interval (QTc) is essential in electrocardiography to account for heart rate variations when assessing cardiac repolarization. Enter your patient's heart rate (bpm), QT interval (ms), sex, and age to get accurate QTc values with interpretation guidelines. The tool provides detailed results including all formula calculations, normal ranges, and clinical interpretation based on established medical thresholds.

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How to Use

Enter the heart rate in beats per minute (bpm)
Enter the QT interval in milliseconds (ms)
Select the patient's sex (male/female)
Enter the patient's age in years
Choose one or more calculation formulas (Bazett, Fridericia, Framingham, Hodges)
Click 'Calculate QTc' to see results
View detailed QTc values, normal ranges, and interpretation for each formula

Frequently Asked Questions

Find Quick Answers

What is QTc and why is it important?

QTc (corrected QT interval) is a heart rate-adjusted measurement of the QT interval on an ECG. It's crucial for assessing cardiac repolarization and detecting conditions like Long QT Syndrome which can lead to dangerous arrhythmias.

Which QTc formula should I use?

Bazett's formula is most common but may overcorrect at high heart rates. Fridericia's formula is more accurate across heart rate ranges. Framingham and Hodges formulas provide alternative corrections. Many clinicians use multiple formulas for comparison.

What are normal QTc values?

For adults: Normal QTc is <440 ms for males and <460 ms for females. Borderline is 440-460 ms for males, 460-480 ms for females. Prolonged QTc is >460 ms for males and >480 ms for females, requiring clinical evaluation.

Can this calculator be used for pediatric patients?

Yes, but age-specific normal ranges differ. This calculator uses adult thresholds (age ≥18). For pediatric patients, consult age-specific QTc reference values as normal ranges vary significantly with age.

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