Blood Pressure Calculator
Classify your blood pressure reading into standard categories.
Category
High BP (Stage 1)
Pulse Pressure
40 mmHg
Systolic (mmHg)
120
Diastolic (mmHg)
80
Systolic vs Diastolic
BP Categories
BP Categories
| Category | BP Range | Systolic (mmHg) | Diastolic (mmHg) |
|---|---|---|---|
| Low BP | < 90 / < 60 | — | — |
| Normal | 90–119 / 60–79 | — | — |
| Elevated | 120–129 / < 80 | — | — |
| High BP (Stage 1) | 130–139 / 80–89 | 120 | 80 |
| High BP (Stage 2) | ≥ 140 / ≥ 90 | — | — |
| Hypertensive Crisis | > 180 / > 120 | — | — |
Practical Example
Blood Pressure = Systolic / Diastolic (mmHg). Categories: Normal (<120/80), Elevated (120-129/<80), Stage 1 (130-139/80-89), Stage 2 (≥140/≥90), Crisis (>180/>120). Pulse Pressure = Systolic − Diastolic.
Frequently Asked Questions
What blood pressure reading is considered normal?
A normal reading is below 120/80 mmHg; 120-129/<80 is elevated, and 130/80 or higher is considered hypertension under current AHA guidelines.
Which number matters more — systolic or diastolic?
Both matter, but systolic (top number) is generally a stronger predictor of cardiovascular risk in adults over 50.
Should I rely on this calculator for diagnosis?
No — this tool is educational only and not medical advice; consult a healthcare provider for diagnosis and treatment of blood pressure issues.
How accurate are these calculations?
These calculations use scientifically validated formulas and provide good estimates for most people. However, individual factors like genetics, medical conditions, and medications can cause variations. Use results as guidelines, not definitive medical diagnoses.
When should I consult a healthcare professional?
Consult a doctor if your results are consistently outside normal ranges, if you experience related symptoms, or before making significant changes to your diet or exercise routine based on calculator results.
Disclaimer: This calculator provides estimates for informational purposes only. Actual results may vary. Consult a qualified professional for personalized advice.