Understanding Blood Pressure
Blood pressure measures the force of blood against artery walls. Systolic = pressure during heartbeat. Diastolic = pressure between beats.
BP Categories (AHA)
| Category | Systolic | Diastolic |
|---|---|---|
| Normal | <120 | <80 |
| Elevated | 120-129 | <80 |
| Stage 1 | 130-139 | 80-89 |
| Stage 2 | ≥140 | ≥90 |
| Crisis | >180 | >120 |
How to Use This Blood Pressure Calculator
Enter your systolic (top number) and diastolic (bottom number) blood pressure readings. The calculator classifies your reading and provides health guidance.
Formula & How It Works
Classification: Normal < 120/80, Elevated 120-129/<80, Stage 1 Hypertension 130-139/80-89, Stage 2 β₯ 140/90, Crisis > 180/120.
Calculation Example
Reading 128/82: Stage 1 Hypertension. This means your heart is working harder than ideal. Lifestyle changes (diet, exercise, reducing sodium) can often bring it to normal.
Expert Tips
Measure at the same time daily, after sitting quietly for 5 minutes. Morning readings are most consistent. Avoid caffeine and exercise 30 minutes before measuring. Track trends, not single readings.
Frequently Asked Questions
What is normal blood pressure?
Below 120/80 mmHg is considered normal. Elevated is 120-129/<80.
How often should I check?
At least once a year if normal. More frequently if elevated or on medication.
Can lifestyle changes lower BP?
Yes. Reducing sodium, exercising, losing weight, limiting alcohol, and managing stress can lower BP by 5-15 mmHg.