Blood Pressure Calculator
Check what your blood pressure reading means using the 2017 ACC/AHA categories, with mean arterial pressure and pulse pressure. Example: 125/78 mmHg is elevated blood pressure, and 135/85 is stage 1 hypertension.
Show steps
How to use the Blood Pressure Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Category is set by whichever of systolic or diastolic falls in the higher band. MAP = (systolic + 2 x diastolic) / 3. Pulse pressure = systolic – diastolic.
Blood pressure categories (ACC/AHA 2017)
| Category | Systolic | Diastolic |
|---|---|---|
| Normal | Below 120 | and below 80 |
| Elevated | 120 to 129 | and below 80 |
| Stage 1 hypertension | 130 to 139 | or 80 to 89 |
| Stage 2 hypertension | 140 or higher | or 90 or higher |
| Hypertensive crisis | Above 180 | and/or above 120 |
Measuring at home
Use a validated upper-arm cuff, sit for five minutes, take two readings a minute apart in the morning and evening for a week, and average them.
Ways to lower blood pressure
Weight loss, the DASH eating pattern, less sodium, more potassium, regular aerobic exercise, limiting alcohol and not smoking each lower pressure by several points.
Different guidelines
The European (ESC/ESH) guidelines define hypertension as 140/90 or above in the office, while ACC/AHA uses 130/80. This calculator is for education and is not medical advice. Decisions about testing and treatment belong with a qualified clinician.
Frequently asked questions
What is a normal blood pressure?
Below 120/80 mmHg.
What blood pressure is too high?
130/80 or higher is stage 1 hypertension; above 180/120 is a crisis.
Which number matters more?
Both; after 50 systolic is usually more important.
What is a low blood pressure?
Generally below 90/60 if it causes symptoms.
How often should I check it?
At least yearly, more often if elevated.
Can one reading diagnose hypertension?
No.
Sources
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