How long is one small square on an EKG in seconds?

One small square on an EKG represents 0.04 seconds. This measurement is crucial in interpreting EKG readings because the EKG paper is standardized, allowing for the precise assessment of the heart's electrical activity. Each small square is divided into larger squares, with five small squares making up one large square, which equals 0.20 seconds. Understanding the time interval each square represents enables healthcare professionals to calculate heart rates, assess the duration of various waves, and evaluate intervals, all of which are essential for accurate diagnosis and treatment. This foundational knowledge is vital when analyzing rhythms and identifying any abnormalities in the heart's electrical conduction.