This blood pressure calculator classifies a reading into the standard categories from your systolic and diastolic numbers. Enter both values above.
Categories (American Heart Association)
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 (seek care)
Example
135/85 mmHg falls in Stage 1.
One reading is only a snapshot; blood pressure varies through the day and should be interpreted by a clinician.
Important
This tool is for general educational purposes only and is not medical advice, diagnosis, or treatment. It does not replace evaluation by a qualified healthcare professional — consult one for any health concern. Last updated: August 2026.
Frequently Asked Questions
What is a normal blood pressure?
Below 120/80 mmHg is considered normal for most adults, per the American Heart Association categories.
What do the blood pressure categories mean?
They range from normal through elevated, stage 1, and stage 2 hypertension, up to a crisis needing urgent care above 180/120.
Is a single reading enough?
No. Blood pressure changes through the day; diagnosis relies on multiple readings interpreted by a clinician.