HomeMedicalCardiologyHeart electrical cycle interval Heart electrical cycle interval Online calculator for finding the heart electrical cycle interval. Calculate the heart electrical cycle interval by the input parameters: measured QT, R-R interval. Get Calculators 0 Measured QTsecMeasured QT R-R IntervalsecR-R Interval CalculateReset QT correctedQT corrected Get Result on email Send the result to an email 1 Number of calculations | 0 Likes Copy Link Print Result