Blood Pressure Staging Calculator (ACC/AHA)
Classify a blood pressure reading using the 2017 ACC/AHA categories, and compare it against the older JNC 7 thresholds still used in some settings.
❤️ Clinical Reference📐 Stage determined by the higher of systolic or diastolic category🏥 Health
Systolic BP (mmHg)
Diastolic BP (mmHg)
Measurement context
Please enter valid values.
Formula & Reference
| Variable | Symbol | Formula | Units |
|---|---|---|---|
| Blood Pressure Staging Calculator (ACC/AHA) | — | Stage determined by the higher of systolic or diastolic category | category |
Step-by-Step Examples
Example 1
Normal
118/76 mmHg.
- Systolic under 120 and diastolic under 80
- Both criteria met for the normal category
✓ Normal
Example 2
Reclassified by 2017 Guidance
134/84 mmHg.
- Systolic 130–139 or diastolic 80–89 → Stage 1 under ACC/AHA
- The same reading was prehypertension under JNC 7
- This reclassification substantially increased hypertension prevalence
✓ Stage 1 hypertension (was prehypertension)
Example 3
Stage 2
152/94 mmHg.
- Systolic 140 or above → Stage 2 under ACC/AHA
- Diastolic 90 or above also meets Stage 2
- The higher category governs
✓ Stage 2 hypertension
Real-World Applications
Diagnosis and Follow-Up
Blood pressure category determines the recommended interval for repeat measurement and whether treatment is discussed.
Home Monitoring
Home and ambulatory readings use lower thresholds and are better predictors of outcome than isolated office readings.
Treatment Thresholds
Whether medication is recommended depends on both category and overall cardiovascular risk, not category alone.
Population Health
The 2017 reclassification changed hypertension prevalence estimates substantially, which matters for public health planning.
Common Mistakes to Avoid
⚠️
Diagnosing hypertension from one reading
Diagnosis requires elevated readings on at least two separate occasions, ideally confirmed with home or ambulatory monitoring.
⚠️
Ignoring measurement technique
Wrong cuff size, talking, a full bladder, crossed legs, or an unsupported arm can each shift readings by 5–15 mmHg.
⚠️
Missing white coat and masked hypertension
Some people are elevated only in clinic, and others only outside it. Both patterns require out-of-office measurement to detect.
Frequently Asked Questions
What are the 2017 ACC/AHA blood pressure categories? ▾
Normal below 120/80, Elevated 120–129 systolic with diastolic under 80, Stage 1 at 130–139 or 80–89, Stage 2 at 140/90 or above, and hypertensive crisis at 180/120 or above.
Why did the thresholds change in 2017? ▾
Trial evidence, particularly SPRINT, suggested cardiovascular benefit from treating at lower thresholds than JNC 7 had recommended.
Does Stage 1 hypertension mean I need medication? ▾
Not necessarily. For Stage 1 without high cardiovascular risk, lifestyle modification is generally recommended first, with medication considered based on overall risk.
Are home blood pressure targets different? ▾
Yes — home and ambulatory thresholds are set roughly 5 mmHg lower than office equivalents, since office readings tend to run higher.
What is a hypertensive crisis? ▾
A reading of 180/120 or above. This requires prompt medical assessment, urgently so if accompanied by chest pain, breathlessness, vision change, or neurological symptoms.