Blood Pressure Calculator - Check Your Reading
Assess your blood pressure reading with this easy-to-use calculator. Instantly see your category (Normal, Elevated, Stage 1, Stage 2) based on 2017 AHA guidelines.
Recent Reading
Enter your latest systolic (top) and diastolic (bottom) numbers to reveal the category and guidance.
Use the nearest whole number from your cuff reading. Validate that the systolic number is higher than the diastolic.
Enter both systolic and diastolic values to see your category.
How to Use This Calculator
Enter your most recent systolic and diastolic pressure readings in mmHg. Click Calculate or wait for automatic updates to see the categorized result along with guidance on what it means for your cardiovascular health.
Methodology
Interpretation: The calculator follows the 2017 guideline thresholds from the American Heart Association. It evaluates your reading hierarchically, checking crisis ranges first before assigning other stages.
Validations prevent impossible combinations (systolic must exceed diastolic, and values remain inside medically plausible bounds) so you always see a meaningful classification.
- Hypertensive Crisis is flagged when the systolic is above 180 or diastolic exceeds 120; emergency guidance is recommended.
- Stage 2 and Stage 1 thresholds follow the standard AHA cutoffs, covering both systolic and diastolic conditions.
- Elevated indicates higher-than-desirable systolic pressure with normal diastolic; Normal stays under 120/80.
Full original guide (expanded)
The legacy version exposed an audit spine with formulas, sources, and verification notes. It tagged the calculator as fully audited with version 0.1.0-draft (2026-01-19) and linked to the homepage, category landing, and scientific references. That material is preserved for continuity in this layout; please see the meta section for the consolidated formula and citation list.