Blood Pressure Categories (AHA 2017)
| Category | Systolic | Diastolic |
|---|---|---|
| Normal | < 120 | < 80 |
| Elevated | 120–129 | < 80 |
| High BP Stage 1 | 130–139 | 80–89 |
| High BP Stage 2 | ≥ 140 | ≥ 90 |
| Hypertensive Crisis | > 180 | > 120 |
| Low (Hypotension) | < 90 | < 60 |
Blood Pressure Calculator
Enter your blood pressure reading to understand what your numbers mean. See your blood pressure category per AHA guidelines, pulse pressure, and mean arterial pressure (MAP).
Blood Pressure Analyzer
Frequently Asked Questions
What do the two numbers mean?
Blood pressure is written as systolic/diastolic (e.g., 120/80 mmHg). Systolic (top) is the pressure when your heart beats and pumps blood. Diastolic (bottom) is the pressure when your heart rests between beats. Both numbers matter — high readings in either indicate elevated blood pressure risk.
When is blood pressure highest?
Blood pressure is typically highest in the morning after waking (due to cortisol release) and lowest during sleep. It rises with physical activity, stress, caffeine, and smoking. For the most accurate reading: rest for 5 minutes, avoid caffeine for 30 minutes, sit with feet flat, arm at heart level, and take 2–3 readings 1 minute apart.
About the Blood Pressure Calculator
This free blood pressure calculator helps you get accurate results instantly without needing to work through the math manually. Whether you need a quick estimate or a precise figure, having a reliable tool on hand saves time and reduces errors compared to manual calculation.
How to Use This Calculator
- Enter your values in the input fields above. Each field is labeled to guide you.
- Double-check your inputs — results are only as accurate as the numbers you enter.
- Click the Calculate button to see your result instantly.
- Use the result for your planning, budgeting, or decision-making.
Why Accurate Calculations Matter
Small errors in health calculations can compound into significant problems. A 1% miscalculation in a budget or measurement can translate to hundreds or thousands of dollars in wasted resources, or result in having to redo work entirely. This calculator uses the standard formulas and methods to give you reliable results you can trust.
Tips for Getting the Best Results
- Use consistent units throughout (all in feet, all in dollars, etc.)
- For estimates, add a 10% buffer to account for real-world variables
- Save your result by taking a screenshot or writing it down before closing the page
- For decisions involving significant money or safety, verify results with a qualified professional
Frequently Asked Questions
Is this calculator free? Yes — completely free with no account, login, or payment required. Use it as many times as you need.
How accurate are the results? This calculator uses the standard formulas for blood pressure calculations. Results are accurate for typical use cases. For specialized or high-stakes applications, consult a professional.
Does it work on mobile? Yes. This calculator is fully responsive and works on smartphones, tablets, and desktops.