Blood Pressure Calculator
Classify systolic and diastolic blood pressure using ACC/AHA and ESC/ESH guidelines with instant interpretation.
What Is Blood Pressure Classification?
Blood pressure is classified using systolic (top) and diastolic (bottom) readings in mmHg. Major guidelines differ slightly: the ACC/AHA 2017 guidelines are widely used in the United States, while ESC/ESH 2018 guidelines are common in Europe. Related tools: Arterial Age Calculator and ABI Calculator.
ACC/AHA Categories
Normal: systolic < 120 and diastolic < 80 mmHg. Elevated: systolic 120–129 and diastolic < 80. Stage 1 hypertension: systolic 130–139 or diastolic 80–89. Stage 2: systolic ≥ 140 or diastolic ≥ 90. Hypertensive crisis: systolic ≥ 180 or diastolic ≥ 120 — seek emergency care.
ESC/ESH Categories
Optimal: < 120 / < 80. Normal: 120–129 / 80–84. High normal: 130–139 / 85–89. Grade 1: 140–159 or 90–99. Grade 2: 160–179 or 100–109. Grade 3: ≥ 180 or ≥ 110. Isolated systolic hypertension occurs when systolic is elevated but diastolic remains below 90 mmHg.
Frequently Asked Questions
What is a normal blood pressure reading?
Under ACC/AHA guidelines, normal is systolic below 120 mmHg and diastolic below 80 mmHg. ESC/ESH labels this range as optimal.
What is isolated systolic hypertension?
Isolated systolic hypertension (ESC/ESH) means elevated systolic pressure (≥ 140 mmHg) with normal diastolic pressure (< 90 mmHg). It is common in older adults.
When is blood pressure a medical emergency?
Under ACC/AHA guidelines, systolic ≥ 180 mmHg or diastolic ≥ 120 mmHg is hypertensive crisis. Seek immediate medical attention, especially with symptoms like chest pain or severe headache.
Which guideline should I use?
Use the guideline recommended by your healthcare provider. ACC/AHA is standard in the US; ESC/ESH is standard in Europe. Both classify risk similarly at higher levels.
Should I diagnose hypertension from one reading?
No. Hypertension diagnosis requires multiple readings on separate occasions. Home monitoring and clinical follow-up are essential.
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