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Blood Pressure Classification Calculator

Classify a blood-pressure reading into the ACC/AHA 2017 categories — from normal to hypertensive crisis — with pulse pressure and mean arterial pressure.

Systolic (top number)

Diastolic (bottom number)

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How it works

Normal <120 and <80 · Elevated 120–129 and <80 · Stage 1 130–139 or 80–89 · Stage 2 ≥140 or ≥90 · Crisis >180 or >120 (ACC/AHA 2017)

The 2017 ACC/AHA guideline classifies blood pressure by whichever number — systolic or diastolic — falls in the higher category. Systolic pressure is the peak as the heart beats; diastolic is the resting pressure between beats. Pulse pressure (the gap between them) and mean arterial pressure (the average driving pressure) add extra context on cardiovascular strain.

Worked example

A reading of 118/76 mmHg has both numbers below the 120/80 thresholds, so it is Normal. The pulse pressure is 118 − 76 = 42 mmHg and the mean arterial pressure is 76 + 42 ÷ 3 ≈ 90 mmHg.

Sources: ACC/AHA 2017 Blood Pressure Guideline

Frequently asked questions

Which number decides the category?

The higher category wins. A reading of 135/78 is Stage 1 hypertension because the systolic value (135) reaches the 130–139 band even though the diastolic (78) is normal.

What is a hypertensive crisis?

A reading above 180/120 mmHg. If it is accompanied by chest pain, shortness of breath, vision changes or weakness, it is a medical emergency — call emergency services rather than waiting.

How should I measure blood pressure?

Sit quietly for five minutes, feet flat, arm supported at heart height, and avoid caffeine or exercise beforehand. Take two or three readings a minute apart and average them; a single high reading is not a diagnosis.

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Educational estimate only — not medical advice, diagnosis or treatment. Consult a qualified clinician for health decisions.