EKG Basics: Small Boxes vs Big Boxes Explained 💡 1 small box = 0.04 seconds 💡 5 small boxes = 1 big box = 0.20 seconds These boxes are how you measure heart rate and rhythm timing, so knowing their value is key before interpreting any strip. 👇 Comment below with your answer: How many big boxes make 1 second on an EKG? #nursingschool #nursingeducation #nursingstudent #futurenurse #nursingstudents #nursing | Nurse Well Versed