Normal Sinus Rhythm
Number of Large Squares Between R Waves: 1 squares
Heart Rate (beats per minute): 300 bpm
ECG Heart Rate Calculator
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Determines heart rate from an electrocardiogram (ECG) strip by measuring the number of large squares between R waves.
More tools:Health Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Number of Large Squares Between R Waves in the units shown.
Step 2
Read Heart Rate (beats per minute) in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Sinus Bradycardia
Number of Large Squares Between R Waves: 2 squares
Heart Rate (beats per minute): 150 bpm
Sinus Tachycardia
Number of Large Squares Between R Waves: 0.5 squares
Heart Rate (beats per minute): 600 bpm
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Important
Use the result as an estimate and confirm any medical decisions with a qualified professional.