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ECG Heart Rate Calculator — Free Online Tool
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ECG Heart Rate Calculator

Calculate heart rate from ECG R-R interval grid squares

ECG Formula: $\text{Heart Rate (bpm)} = \frac{1500}{\text{Small Boxes}}$ or $\frac{300}{\text{Large Boxes}}$. Normal resting heart rate ranges from 60 to 100 bpm. Enter R-R interval boxes below.
R-R Interval Input

Calculation Results

⚠️ Not medical advice. For clinical nursing, medical education, and ECG reference only. Electrocardiogram interpretations and rhythm analyses must be verified by a qualified physician or cardiologist.

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