ECG Heart Rate Calculator
This calculator helps you determine your heart rate from an electrocardiogram (ECG) strip. The heart rate is calculated based on the time interval between consecutive R waves (R-R interval).
Calculate Heart Rate
function calculateHeartRate() {
var rrIntervalBoxes = parseFloat(document.getElementById("rrInterval").value);
var paperSpeed = parseFloat(document.getElementById("paperSpeed").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(rrIntervalBoxes) || isNaN(paperSpeed) || rrIntervalBoxes <= 0 || paperSpeed <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for R-R interval and paper speed.";
return;
}
// Calculate R-R interval in seconds
var rrIntervalSeconds = rrIntervalBoxes * 0.04; // Assuming 1 small box = 0.04 seconds
// Calculate heart rate in beats per minute (BPM)
// Formula: HR = 60 / R-R interval in seconds
var heartRateBPM = 60 / rrIntervalSeconds;
resultDiv.innerHTML = "
Calculated Heart Rate: " + heartRateBPM.toFixed(0) + " BPM";
}
#ecgHeartRateCalculator {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
}
#ecgHeartRateCalculator h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.form-group input[type="text"] {
width: calc(100% – 22px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
.form-group .help-text {
font-size: 0.8em;
color: #777;
margin-top: 5px;
}
#ecgHeartRateCalculator button {
display: block;
width: 100%;
padding: 12px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
margin-top: 20px;
}
#ecgHeartRateCalculator button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
padding: 15px;
background-color: #e7f3e7;
border: 1px solid #a8d8a8;
border-radius: 4px;
text-align: center;
font-size: 1.1em;
color: #333;
}