Blood Pressure Calculator
Classify Your Blood Pressure, Understand Your Cardiovascular Risk
Systolic blood pressure (upper number)
Diastolic blood pressure (lower number)
About the Blood Pressure Calculator
The Blood Pressure calculator classifies your systolic and diastolic blood pressure reading according to both the American Heart Association (AHA) and European Society of Cardiology (ESC) guidelines, providing you with a clinical category, risk interpretation, and evidence-based guidance. Blood pressure is the force exerted by circulating blood against the walls of the arteries — a fundamental cardiovascular health marker. Hypertension (high blood pressure) is the most common preventable risk factor for cardiovascular disease globally, affecting approximately 1.3 billion people worldwide. It is often called the 'silent killer' because it typically produces no symptoms until significant organ damage has occurred. Chronically elevated blood pressure damages arterial walls, accelerates atherosclerosis, and dramatically increases the risk of heart attack, stroke, kidney disease, and heart failure. A single blood pressure reading provides useful information but does not constitute a diagnosis. Blood pressure fluctuates throughout the day in response to activity, stress, temperature, and time of day. Hypertension is typically diagnosed based on multiple readings taken on separate occasions, ideally under standardized conditions. Home blood pressure monitoring over 7 days provides more reliable information than single clinic readings.
How Blood Pressure is Classified
This calculator applies two classification systems simultaneously. The AHA/ACC system classifies: < 120/80 as Normal; 120–129/< 80 as Elevated; 130–139/80–89 as Stage 1 Hypertension; ≥ 140/≥ 90 as Stage 2 Hypertension; ≥ 180/≥ 120 as Hypertensive Crisis. The ESC system classifies: < 120/< 80 as Optimal; 120–129/80–84 as Normal; 130–139/85–89 as High Normal; 140–159/90–99 as Grade 1 Hypertension; 160–179/100–109 as Grade 2; ≥ 180/≥ 110 as Grade 3. When systolic and diastolic readings fall in different categories, the higher category takes precedence. Both systems are widely used — the ESC framework is standard in Europe and the AHA/ACC framework in the United States.
Frequently Asked Questions
An optimal blood pressure is below 120/80 mmHg, where 120 is the systolic (peak pressure when the heart beats) and 80 is the diastolic (pressure when the heart rests between beats). While slightly above normal can indicate increasing risk, a reading consistently below 120/80 in otherwise healthy individuals is associated with the lowest long-term cardiovascular risk.
White coat hypertension refers to elevated blood pressure readings in clinical settings due to anxiety or stress, with normal readings at home. It is estimated to affect 15–30% of people. While white coat hypertension was historically considered benign, more recent research suggests it may still indicate a slightly elevated long-term cardiovascular risk compared to truly normal blood pressure. Home monitoring is recommended to distinguish it from true hypertension.
The most effective non-pharmacological interventions for reducing blood pressure are: the DASH diet (rich in fruits, vegetables, whole grains, and low-fat dairy); reducing sodium intake to under 1,500–2,300 mg/day; regular aerobic exercise (150 min/week of moderate intensity); weight loss (each 1 kg lost reduces systolic BP by ~1 mmHg); limiting alcohol; and stopping smoking. These changes together can reduce systolic BP by 10–20 mmHg in some individuals.
Try our other calculators!
Get the app
Ready to Change the Way You Eat?
Download Fooder today and take the first step toward smarter grocery shopping, healthier eating, and a more sustainable lifestyle.
Download on the App Store 
Coming soon on Google Play