Check your current reading against medical standards and age-specific averages.
Understanding Your Results
Blood pressure is the force of your blood pushing against the walls of your arteries. Each time your heart beats, it pumps blood into the arteries. Your blood pressure is highest when your heart beats, pumping the blood. This is called systolic pressure. When your heart is at rest, between beats, your blood pressure falls. This is called diastolic pressure.
Normal Blood Pressure Range by Age Chart
Age Group
Minimum (mmHg)
Normal (mmHg)
Maximum (mmHg)
1-12 Months
75/50
90/60
100/75
1-5 Years
80/55
95/65
110/79
6-13 Years
90/60
105/70
115/80
14-19 Years
105/73
117/77
120/81
20-24 Years
108/75
120/79
132/83
25-29 Years
109/76
121/80
133/84
30-34 Years
110/77
122/81
134/85
35-39 Years
111/78
123/82
135/86
40-44 Years
112/79
124/83
137/87
45-49 Years
115/80
127/84
139/88
50-54 Years
116/81
129/85
142/89
55-59 Years
118/82
131/86
144/90
60+ Years
121/83
134/87
147/91
AHA Categories (Universal Guidelines)
Normal: Less than 120/80 mmHg.
Elevated: Systolic between 120–129 AND diastolic less than 80.
Hypertension Stage 1: Systolic between 130–139 OR diastolic between 80–89.
Hypertension Stage 2: Systolic 140 or higher OR diastolic 90 or higher.
Hypertensive Crisis: Systolic higher than 180 AND/OR diastolic higher than 120. Seek immediate medical care.
Factors That Affect Blood Pressure
While age is a primary factor in blood pressure trends, several other lifestyle elements play a role:
Sodium Intake: High salt diets can cause the body to retain fluid, increasing pressure.
Physical Activity: Regular exercise strengthens the heart, allowing it to pump more blood with less effort.
Stress: Temporary spikes in blood pressure are common during stressful events.
Weight: Being overweight increases the strain on the cardiovascular system.
function calculateBP() {
var age = parseFloat(document.getElementById('bp_age').value);
var sys = parseFloat(document.getElementById('bp_systolic').value);
var dia = parseFloat(document.getElementById('bp_diastolic').value);
var resultDiv = document.getElementById('bp-result');
if (isNaN(age) || isNaN(sys) || isNaN(dia)) {
alert("Please enter valid numbers for Age, Systolic, and Diastolic values.");
return;
}
var category = "";
var cssClass = "";
var ageIdeal = "";
// Determine AHA Category
if (sys >= 180 || dia >= 120) {
category = "Hypertensive Crisis (Emergency)";
cssClass = "status-crisis";
} else if (sys >= 140 || dia >= 90) {
category = "Hypertension Stage 2";
cssClass = "status-hypertension2";
} else if ((sys >= 130 && sys = 80 && dia = 120 && sys <= 129 && dia < 80) {
category = "Elevated Blood Pressure";
cssClass = "status-elevated";
} else if (sys < 120 && dia < 80) {
category = "Normal Blood Pressure";
cssClass = "status-normal";
} else {
// Fallback for edge cases like high diastolic but low systolic
category = "Mixed Reading (Consult Doctor)";
cssClass = "status-hypertension1";
}
// Age-specific Ideal Ranges
if (age < 1) { ageIdeal = "90/60 mmHg"; }
else if (age <= 5) { ageIdeal = "95/65 mmHg"; }
else if (age <= 13) { ageIdeal = "105/70 mmHg"; }
else if (age <= 19) { ageIdeal = "117/77 mmHg"; }
else if (age <= 24) { ageIdeal = "120/79 mmHg"; }
else if (age <= 29) { ageIdeal = "121/80 mmHg"; }
else if (age <= 34) { ageIdeal = "122/81 mmHg"; }
else if (age <= 39) { ageIdeal = "123/82 mmHg"; }
else if (age <= 44) { ageIdeal = "124/83 mmHg"; }
else if (age <= 49) { ageIdeal = "127/84 mmHg"; }
else if (age <= 54) { ageIdeal = "129/85 mmHg"; }
else if (age <= 59) { ageIdeal = "131/86 mmHg"; }
else { ageIdeal = "134/87 mmHg"; }
resultDiv.style.display = "block";
resultDiv.className = cssClass;
var html = "Analysis: " + category + "";
html += "Your Reading: " + sys + "/" + dia + " mmHg";
html += "Typical average for age " + age + ": " + ageIdeal + "";
html += "Disclaimer: This calculator is for informational purposes only. Always consult a medical professional for diagnosis and treatment.";
resultDiv.innerHTML = html;
}