QTc — Corrected QT interval

QT interval(ms)
Measure from start of Q to end of T in the lead with the longest QT (typically II or V2-V3).
Heart rate(bpm)
Provide either HR (bpm) here OR RR (ms) below — one of the two is required.
RR interval (alternative)(ms)
Alternative to HR. RR = 60000 / HR.
Sex
Biological sex — determines Bazett normal bands (males have stricter upper limit).