ECG Pulse Rate Calculator
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"name": "What is the 300 rule in ECG calculation?",
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"text": "The 300 rule is a quick method to calculate heart rate on an ECG. It involves dividing 300 by the number of large squares between two consecutive R waves. This method is best used for regular rhythms."
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"name": "How do you calculate heart rate using the 1500 method?",
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"text": "The 1500 method is more precise than the 300 rule. You count the number of small squares between two consecutive R waves and divide 1500 by that number. This is ideal for fast rhythms or when high precision is needed."
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"name": "What is the 6-second strip method?",
"acceptedAnswer": {
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"text": "The 6-second method is used for irregular rhythms (like atrial fibrillation). You count the number of QRS complexes (R waves) within a 6-second period on the ECG strip and multiply by 10 to get the beats per minute."
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"name": "What is a normal pulse rate calculated from an ECG?",
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"text": "A normal resting heart rate usually falls between 60 and 100 beats per minute (BPM). Rates below 60 indicate bradycardia, while rates above 100 indicate tachycardia."
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ECG Pulse Rate Calculator
Calculate heart rate (BPM) from an ECG strip using the 300, 1500, or 6-Second methods.
Large Square Method (The 300 Rule)
Small Square Method (The 1500 Rule)
6-Second Strip Method (Irregular Rhythm)
Count the large boxes (5mm) between two R waves.
Estimated Heart Rate0 BPM
How to Calculate Pulse Rate in ECG
Calculating the pulse rate or heart rate from an electrocardiogram (ECG/EKG) is a fundamental skill for healthcare professionals. An ECG records the electrical activity of the heart over time. To calculate the rate accurately, you must first determine if the rhythm is regular or irregular.
Standard Calibration: Standard ECG paper moves at a speed of 25 mm/second.
1 Small Square = 0.04 seconds (1 mm)
1 Large Square = 0.20 seconds (5 mm or 5 small squares)
5 Large Squares = 1 second
Method 1: The 300 Rule (Large Square Method)
This is the quickest method for estimating heart rate when the rhythm is regular. It relies on the memory sequence: 300, 150, 100, 75, 60, 50.
Formula:Heart Rate = 300 / Number of Large Squares between R-R intervals
To use this method:
Identify two consecutive R waves (the tall peaks of the QRS complex).
Count the number of large squares (5mm boxes) between them.
Divide 300 by this number.
Example: If there are 4 large squares between R waves, the heart rate is 300 / 4 = 75 BPM.
Method 2: The 1500 Rule (Small Square Method)
This method is more precise than the 300 rule and is ideal for fast rhythms or when you need an exact calculation.
Formula:Heart Rate = 1500 / Number of Small Squares between R-R intervals
To use this method:
Identify two consecutive R waves.
Count the number of tiny small squares (1mm boxes) between them.
Divide 1500 by this number.
Example: If there are 20 small squares between R waves, the heart rate is 1500 / 20 = 75 BPM.
Method 3: The 6-Second Strip Method
This method is the gold standard for calculating heart rate in irregular rhythms (such as Atrial Fibrillation). The other methods assume the distance between beats is constant, which causes errors if the rhythm varies.
Formula:Heart Rate = Number of R Waves in 6 seconds × 10
To use this method:
Obtain a 6-second strip of the ECG (this is usually 30 large squares).
Count the number of complete QRS complexes (R waves) within that 6-second period.
Multiply the count by 10 to get the rate for 60 seconds (1 minute).
Example: If you count 8 R waves in a 6-second strip, the heart rate is 8 × 10 = 80 BPM.
Interpreting the Results
Normal Sinus Rhythm: 60 – 100 BPM
Sinus Bradycardia: Less than 60 BPM
Sinus Tachycardia: Greater than 100 BPM
function updateInputLabel() {
var method = document.getElementById('ecgMethod').value;
var label = document.getElementById('dynamicLabel');
var helper = document.getElementById('helperText');
var input = document.getElementById('ecgInput');
// Reset display
document.getElementById('resultBox').style.display = 'none';
input.value = ";
if (method === '300') {
label.innerText = 'Number of Large Squares between R-R';
input.placeholder = 'e.g., 4';
helper.innerText = 'Count the large boxes (5mm) between two R waves. Best for regular rhythms.';
} else if (method === '1500') {
label.innerText = 'Number of Small Squares between R-R';
input.placeholder = 'e.g., 20';
helper.innerText = 'Count the small boxes (1mm) between two R waves. Most precise method.';
} else if (method === '6sec') {
label.innerText = 'Number of QRS Complexes (R Waves)';
input.placeholder = 'e.g., 7';
helper.innerText = 'Count the number of R waves in a 6-second (30 large squares) strip.';
}
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function calculateECG() {
var method = document.getElementById('ecgMethod').value;
var inputValue = parseFloat(document.getElementById('ecgInput').value);
var resultDisplay = document.getElementById('bpmResult');
var interpretationDisplay = document.getElementById('interpretation');
var resultBox = document.getElementById('resultBox');
var bpm = 0;
// Validation
if (isNaN(inputValue) || inputValue <= 0) {
alert("Please enter a valid positive number.");
return;
}
// Logic
if (method === '300') {
// Formula: 300 / Large Squares
bpm = 300 / inputValue;
} else if (method === '1500') {
// Formula: 1500 / Small Squares
bpm = 1500 / inputValue;
} else if (method === '6sec') {
// Formula: Count * 10
bpm = inputValue * 10;
}
// Rounding
bpm = Math.round(bpm);
// Display Result
resultDisplay.innerText = bpm + " BPM";
resultBox.style.display = 'block';
// Interpretation Logic
interpretationDisplay.className = 'ecg-interpretation'; // Reset classes
if (bpm = 60 && bpm <= 100) {
interpretationDisplay.innerHTML = "Normal Resting Heart Rate";
interpretationDisplay.classList.add('status-normal');
} else {
interpretationDisplay.innerHTML = "Tachycardia (Fast Heart Rate)";
interpretationDisplay.classList.add('status-danger');
}
}