Corrected QT (QTc) Calculator
Correct the ECG QT interval for heart rate.
Your result
QTc is within the normal range. Fridericia is more reliable at fast or slow heart rates.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
Search by intent
Find this tool when you want to:
Learn more
The QT Interval and Medication Safety
Why some medicines affect your heart rhythm and how QTc is measured.
Heart HealthUnderstanding Blood Pressure Readings
What the top and bottom numbers mean and the categories that guide care.
Heart HealthHow to Lower Blood Pressure Naturally
Lifestyle changes can cut systolic pressure by 5 to 10 mmHg or more.
Frequently asked questions
What does the Corrected QT (QTc) Calculator do?
Correct the ECG QT interval for heart rate. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: long qt; ecg interval; qt prolongation medication.