QTc Calculator

Summary

Enter QT interval and heart rate to calculate corrected QTc using four standard formulas with normal range interpretation.

How it works

1. Enter the measured QT interval in milliseconds (read from ECG).
2. Enter the heart rate in beats per minute (bpm).
3. The tool calculates the RR interval from the heart rate.
4. Each of the four formulas applies its correction to produce QTc.
5. Results are color-coded: normal, borderline, or prolonged per clinical thresholds.
6. All calculations run instantly in your browser — no data is sent to any server.

Use cases

• Screen patients for drug-induced QT prolongation before prescribing.
• Monitor QTc during treatment with antiarrhythmics, antipsychotics, or antibiotics.
• Compare multiple correction methods when heart rate is outside the 60–100 bpm range.
• Quickly assess ECG strips in emergency or cardiology settings.
• Educational use for medical students learning ECG interpretation.
• Telemedicine triage when a remote patient shares ECG measurements.

Frequently Asked Questions