Blood pressure is a vital sign that measures the force of blood pushing against the walls of your arteries as your heart pumps blood. It's recorded as two numbers: systolic pressure (the higher number) and diastolic pressure (the lower number). For example, 120/80 mmHg.
Maintaining healthy blood pressure is crucial for preventing serious health problems like heart disease, stroke, and kidney failure. This calculator helps you understand where your current blood pressure reading falls based on the latest guidelines from organizations like the American Heart Association (AHA).
How the Classification Works:
Systolic Pressure: The top number, representing the pressure in your arteries when your heart beats.
Diastolic Pressure: The bottom number, representing the pressure in your arteries when your heart rests between beats.
The classifications are determined by the higher of the two numbers. For instance, if your systolic pressure is 135 mmHg and your diastolic is 85 mmHg, you would be classified based on the systolic reading of 135 mmHg.
The categories are generally defined as follows (based on AHA guidelines):
Normal: Less than 120 systolic AND less than 80 diastolic.
Elevated: 120-129 systolic AND less than 80 diastolic.
Hypertension Stage 1: 130-139 systolic OR 80-89 diastolic.
Hypertension Stage 2: 140 or higher systolic OR 90 or higher diastolic.
Hypertensive Crisis: Higher than 180 systolic AND/OR higher than 120 diastolic. (Requires immediate medical attention).
This calculator is a tool for informational purposes and is not a substitute for professional medical advice. Always consult with a qualified healthcare provider for any health concerns or before making any decisions related to your health or treatment.
Blood pressure guidelines can evolve. This calculator reflects current widely accepted standards.
function calculateBloodPressureClassification() {
var systolicInput = document.getElementById("systolic");
var diastolicInput = document.getElementById("diastolic");
var resultDiv = document.getElementById("result");
var classificationDiv = resultDiv.querySelector(".classification");
var detailsDiv = resultDiv.querySelector(".details");
var systolic = parseFloat(systolicInput.value);
var diastolic = parseFloat(diastolicInput.value);
classificationDiv.style.color = "#004a99"; // Reset color
classificationDiv.style.fontSize = "1.5rem";
detailsDiv.innerHTML = "";
if (isNaN(systolic) || isNaN(diastolic) || systolic <= 0 || diastolic = 180 || diastolic >= 120) {
classification = "Hypertensive Crisis";
classificationDiv.style.color = "#dc3545"; // Red for crisis
description = "Seek immediate medical attention. Your blood pressure is dangerously high.";
} else if (systolic >= 140 || diastolic >= 90) {
classification = "Hypertension Stage 2";
classificationDiv.style.color = "#ffc107"; // Orange/Yellow for Stage 2
description = "Your blood pressure is high. Lifestyle changes and medication may be recommended. Consult your doctor.";
} else if (systolic >= 130 || diastolic >= 80) {
classification = "Hypertension Stage 1";
classificationDiv.style.color = "#fd7e14"; // Darker orange for Stage 1
description = "Your blood pressure is elevated. Lifestyle changes are important. Discuss with your doctor.";
} else if (systolic >= 120 && diastolic < 80) {
classification = "Elevated";
classificationDiv.style.color = "#007bff"; // Blue for Elevated
description = "Your blood pressure is higher than normal but not yet in the hypertension range. Focus on healthy habits.";
} else if (systolic < 120 && diastolic Stage 1; 110/85 -> Stage 1. The logic works.
// Added a fallback for unexpected scenarios, though unlikely with the above checks.
classification = "Classification Not Determined";
classificationDiv.style.color = "#6c757d";
description = "Please ensure both values are entered correctly and fall within expected ranges.";
}
classificationDiv.textContent = classification;
detailsDiv.textContent = description;
}