Blood Pressure Calculator - AHA Category Classification
Enter your systolic and diastolic blood pressure to see how the reading is classified under American Heart Association guidelines, with guidance on next steps.
Blood Pressure Reading
Classified per AHA guidelines.
Classification
Blood Pressure
118/76
NormalBlood pressure is within the normal range.
Maintain healthy diet, regular activity, and routine check-ups.
Methodology and limitations
Last reviewed:
Methodology
Classifies entered systolic and diastolic readings using AHA/ACC adult blood pressure categories from normal through hypertensive crisis.
Limitations
A single reading is not a diagnosis. Home monitors, cuff size, stress, and time of day affect results. Confirm elevated readings with repeated measurements and a clinician.
Official sources
How Blood Pressure Categories Work
Enter your systolic and diastolic blood pressure to see how the reading is classified under American Heart Association guidelines, with guidance on next steps.
Method used
The calculator compares your entered systolic and diastolic readings against AHA/ACC adult blood pressure categories from normal through hypertensive crisis and returns a plain-language recommendation.
Category = highest threshold matched (systolic OR diastolic)
Practical example
A reading of 128/78 mmHg falls in the elevated category because systolic is 120-129 while diastolic remains below 80.
- Systolic pressure in mmHg (top number)
- Diastolic pressure in mmHg (bottom number)
The result shows the category name, description, follow-up recommendation, and a crisis flag for readings above 180/120.
Assumptions
- Readings follow standard upper-arm cuff measurement.
- Categories follow common AHA/ACC adult thresholds.
- One reading is not sufficient for diagnosis.
What this includes
- BP category, description, recommendation text, and hypertensive crisis alert.
What this excludes
- Ambulatory BP monitoring, white-coat effect, pediatric percentiles, pregnancy-specific thresholds, and medication dosing.
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Frequently Asked Questions
What is normal blood pressure?
The American Heart Association defines normal as systolic below 120 mmHg and diastolic below 80 mmHg when measured correctly. Readings should be confirmed with repeated measurements over days, ideally seated, feet flat, arm supported, after resting. One high reading does not equal a diagnosis. This tool classifies educational estimates only—urgent symptoms need emergency care.
What is the difference between systolic and diastolic?
Systolic is the pressure when the heart contracts and pushes blood out; diastolic is the pressure while the heart rests between beats. Both numbers matter for cardiovascular risk assessment and AHA category assignment. Enter them exactly as shown on your validated cuff. If systolic and diastolic fall in different categories, clinicians usually classify by the higher-risk reading.
When is blood pressure a hypertensive crisis?
Readings above 180 systolic or above 120 diastolic are classified as hypertensive crisis ranges under common AHA teaching. Seek emergency medical care—especially with chest pain, shortness of breath, neurologic changes, or severe headache—rather than waiting to recheck repeatedly at home. This calculator cannot triage emergencies; act on symptoms and crisis-range numbers promptly.
Should I diagnose hypertension from one reading?
No. Hypertension diagnosis typically requires multiple elevated readings, often on separate days, plus clinical context. Home monitors and in-office confirmation both play roles, and white-coat or masked hypertension can confuse single checks. Use this page to understand AHA categories, then share a log of readings with your clinician for formal evaluation and treatment decisions.
What lifestyle changes lower blood pressure?
Evidence-aligned habits include reducing excess sodium, increasing physical activity as cleared by a clinician, limiting alcohol, managing weight, improving sleep, and practicing stress reduction. Medication is often needed and is not a failure—discuss options with your doctor rather than relying on lifestyle alone for Stage 2 hypertension. Never stop prescribed drugs based on a website reading.