Blood pressure is a vital sign that measures the force of blood pushing against the walls of your arteries. It's expressed as two numbers, written as systolic pressure over diastolic pressure (e.g., 120/80 mmHg).
Systolic Pressure (the top number): This represents the pressure in your arteries when your heart beats and pumps blood.
Diastolic Pressure (the bottom number): This represents the pressure in your arteries when your heart rests between beats.
Maintaining healthy blood pressure is crucial for preventing serious health problems like heart disease, stroke, and kidney failure. This calculator helps you understand what your readings mean in general terms.
How to Interpret Your Blood Pressure:
Blood pressure readings are typically categorized to help individuals and healthcare providers understand their cardiovascular risk. Here's a general guideline based on common medical standards. Always consult with a healthcare professional for a definitive diagnosis and treatment plan.
Normal: Less than 120/80 mmHg. This is the ideal range.
Elevated: Systolic between 120-129 mmHg and diastolic less than 80 mmHg. This stage indicates an increased risk of developing high blood pressure. Lifestyle changes are recommended.
Hypertension Stage 1: Systolic between 130-139 mmHg OR diastolic between 80-89 mmHg. Medical advice and lifestyle changes are usually recommended.
Hypertension Stage 2: Systolic 140 mmHg or higher OR diastolic 90 mmHg or higher. This stage requires medical intervention and significant lifestyle changes.
Hypertensive Crisis: Systolic higher than 180 mmHg and/or diastolic higher than 120 mmHg. This is a medical emergency requiring immediate attention.
This calculator uses the provided systolic and diastolic values to provide a general classification. The calculation logic is as follows:
It takes the user's input for Systolic Pressure and Diastolic Pressure.
It compares these values against established thresholds for different blood pressure categories.
It outputs a classification such as "Normal", "Elevated", "Hypertension Stage 1", "Hypertension Stage 2", or "Hypertensive Crisis".
Disclaimer: This calculator is for informational purposes only and does not constitute medical advice. It is essential to discuss your blood pressure readings with a qualified healthcare provider.
function calculateBPStatus() {
var systolicInput = document.getElementById("systolic");
var diastolicInput = document.getElementById("diastolic");
var resultDiv = document.getElementById("result");
var systolic = parseFloat(systolicInput.value);
var diastolic = parseFloat(diastolicInput.value);
// Clear previous results
resultDiv.innerHTML = ";
// Validate inputs
if (isNaN(systolic) || isNaN(diastolic)) {
resultDiv.innerHTML = 'Please enter valid numbers for both systolic and diastolic pressure.';
return;
}
// Ensure values are not negative and within a reasonable range (optional but good practice)
if (systolic < 0 || diastolic 300 || diastolic > 200) {
resultDiv.innerHTML = 'Please enter realistic blood pressure values.';
return;
}
var status = ";
var description = ";
if (systolic >= 180 || diastolic >= 120) {
status = 'Hypertensive Crisis';
description = 'Seek immediate medical attention!';
} else if (systolic >= 140 || diastolic >= 90) {
status = 'Hypertension Stage 2';
description = 'Requires medical attention and lifestyle changes.';
} else if (systolic >= 130 || diastolic >= 80) {
status = 'Hypertension Stage 1';
description = 'Medical advice and lifestyle changes recommended.';
} else if (systolic >= 120 || diastolic >= 80) { // This condition implies systolic is 120-129 AND diastolic is = 120 || diastolic >= 80)) {
// This situation should theoretically not be reached if the logic above is correct,
// but it's a safeguard. The "Elevated" check above should catch it.
// If we reach here, it might indicate an issue with logic flow or an edge case missed.
// For this specific calculator, the 'else if (systolic >= 120 || diastolic >= 80)' before the final 'else' handles elevated correctly.
}
resultDiv.innerHTML = status + ' (' + systolic + '/' + diastolic + ' mmHg)';
}