Count your heartbeats for exactly 15 seconds and enter the number here.
Calculated Heart Rate
—
BPM
Pulse Pressure
—
mmHg
Mean Arterial Pressure
—
mmHg
Blood Pressure Category
—
Rate Pressure Product (RPP)
— (Indicator of myocardial oxygen consumption)
function calculateCardioMetrics() {
var sysInput = document.getElementById("systolicInput");
var diaInput = document.getElementById("diastolicInput");
var pulseInput = document.getElementById("pulseCountInput");
var errorDiv = document.getElementById("errorDisplay");
var resultDiv = document.getElementById("result-area");
var sys = parseFloat(sysInput.value);
var dia = parseFloat(diaInput.value);
var pulses = parseFloat(pulseInput.value);
// Reset display
errorDiv.style.display = "none";
resultDiv.style.display = "none";
// Validation
if (isNaN(sys) || isNaN(dia) || isNaN(pulses)) {
errorDiv.innerText = "Please fill in all fields with valid numbers.";
errorDiv.style.display = "block";
return;
}
if (sys <= dia) {
errorDiv.innerText = "Systolic pressure must be higher than Diastolic pressure.";
errorDiv.style.display = "block";
return;
}
if (sys 300 || dia 200) {
errorDiv.innerText = "Please enter realistic blood pressure values.";
errorDiv.style.display = "block";
return;
}
// Calculations
var heartRate = pulses * 4; // 15 seconds * 4 = 60 seconds
var pulsePressure = sys – dia;
var map = dia + (pulsePressure / 3);
var rpp = sys * heartRate;
// Display Numeric Results
document.getElementById("hrResult").innerText = Math.round(heartRate);
document.getElementById("ppResult").innerText = Math.round(pulsePressure);
document.getElementById("mapResult").innerText = Math.round(map);
document.getElementById("rppResult").innerText = rpp.toLocaleString();
// BP Categorization (AHA Guidelines)
var category = "";
var catColor = "#3498db";
if (sys < 120 && dia = 120 && sys <= 129 && dia = 130 && sys = 80 && dia = 140 || dia >= 90) {
category = "High Blood Pressure (Hypertension) Stage 2";
catColor = "#e74c3c";
} else if (sys > 180 || dia > 120) {
category = "Hypertensive Crisis (Consult Doctor Immediately)";
catColor = "#c0392b";
}
var catText = document.getElementById("bpCategoryText");
var catBox = document.getElementById("bpCategoryBox");
catText.innerHTML = "" + category + ". Based on American Heart Association guidelines.";
catBox.style.borderLeftColor = catColor;
resultDiv.style.display = "block";
}
Understanding Heart Rate and Blood Pressure Metrics
While blood pressure and heart rate (pulse) are two separate vital signs, they are closely related indicators of your cardiovascular health. Many people search for ways to "calculate heart rate from blood pressure," but strictly speaking, one cannot be mathematically derived from the other because they measure different physiological mechanisms.
Blood Pressure measures the force of blood against your artery walls, while Heart Rate measures the number of times your heart beats per minute. However, by using the calculator above, you can analyze the relationship between the two using standard hemodynamic formulas.
The Difference Between Pulse Rate and Pulse Pressure
A common confusion arises between "Pulse Rate" (your BPM) and "Pulse Pressure."
Pulse Rate (Heart Rate): The speed of the heartbeat, calculated by counting beats (pulses) over a specific time (e.g., 15 seconds) and multiplying to get beats per minute (BPM).
Pulse Pressure: The mathematical difference between your Systolic (top) and Diastolic (bottom) blood pressure numbers. It represents the force that the heart generates each time it contracts.
For example, if your blood pressure is 120/80 mmHg, your pulse pressure is 40 mmHg (120 – 80). A pulse pressure that is consistently high (greater than 60 mmHg) may indicate stiffness in the arteries.
What is Mean Arterial Pressure (MAP)?
The Mean Arterial Pressure is a vital calculation used by medical professionals to determine if vital organs are receiving enough blood flow. It is not a simple average because the heart spends more time in diastole (relaxing) than systole (contracting).
Formula: MAP ≈ Diastolic BP + (Pulse Pressure / 3).
A normal MAP range is typically between 70 and 100 mmHg. Values below 60 mmHg may indicate that organs are not receiving adequate perfusion.
The Rate Pressure Product (RPP)
The Rate Pressure Product (also known as the Double Product) is a valuable index calculated by multiplying your Heart Rate by your Systolic Blood Pressure. It serves as a reliable indicator of the myocardial oxygen consumption—essentially, how hard your heart is working.
Formula: RPP = Heart Rate × Systolic BP.
Cardiologists often use this metric during stress tests to evaluate the workload of the heart.
How to Measure Heart Rate Manually
To use the calculator above effectively, you need to count your pulse manually if you do not have a digital monitor.
Place your index and middle fingers on your neck (carotid artery) or wrist (radial artery).
Watch a clock and count the number of beats you feel for exactly 15 seconds.
Enter this number into the "Manual Pulse Count" field above.
The calculator will multiply this by 4 to provide your Beats Per Minute (BPM).