Health

Blood Pressure Calculator

Categorize your blood pressure reading and track multiple measurements over time.

Quick Answer

Normal blood pressure is below 120/80 mmHg. Elevated is 120-129/<80. Stage 1 hypertension is 130-139/80-89. Stage 2 is 140+/90+. Enter your reading below for a personalized assessment.

mmHg (typical range: 90-200)

mmHg (typical range: 60-130)

Disclaimer: This tool is for educational purposes only and does not replace professional medical advice. Blood pressure should be measured with a validated device following proper technique. Always consult your healthcare provider for diagnosis and treatment of hypertension or any medical condition.

About This Tool

The Blood Pressure Calculator categorizes your blood pressure reading using the American Heart Association (AHA) guidelines. Enter your systolic and diastolic values to see where you fall on the spectrum from normal to hypertensive crisis. You can also track multiple readings to monitor trends over time.

High blood pressure (hypertension) is called the "silent killer" because it typically has no symptoms but significantly increases risk of heart attack, stroke, kidney disease, and other serious conditions. About 47% of US adults have hypertension, and many do not know it. Regular monitoring is one of the simplest and most important things you can do for your health.

Tips for Accurate Readings

Sit with your back supported and feet flat on the floor. Rest your arm on a table at heart level. Do not talk during the measurement. Avoid caffeine, exercise, and smoking for 30 minutes before. Take 2-3 readings one minute apart and record the average. Measure at the same time each day for consistency.

Frequently Asked Questions

What is a normal blood pressure reading?
Normal blood pressure is below 120/80 mmHg. The top number (systolic) measures pressure when your heart beats, and the bottom number (diastolic) measures pressure between beats. Both numbers matter. Consistently reading above 120/80 indicates elevated blood pressure or hypertension.
What do the blood pressure categories mean?
Normal: below 120/80. Elevated: systolic 120-129 and diastolic below 80. Stage 1 Hypertension: systolic 130-139 or diastolic 80-89. Stage 2 Hypertension: systolic 140+ or diastolic 90+. Hypertensive Crisis: systolic over 180 or diastolic over 120 -- seek emergency care immediately.
How often should I check my blood pressure?
If your BP is normal, check it at least once a year during regular checkups. If it is elevated or you are managing hypertension, your doctor may recommend checking it daily or several times per week. Home monitoring with a validated device is recommended for anyone with elevated BP. Take readings at the same time each day for consistency.
What affects blood pressure readings?
Many factors cause temporary BP changes: caffeine (raises for 1-3 hours), stress and anxiety, recent exercise, full bladder, alcohol, smoking, body position (arm position matters), time of day (usually lower in the morning), and the white coat effect (higher at the doctor's office). For accurate readings, sit quietly for 5 minutes before measuring.
How can I lower my blood pressure naturally?
Evidence-based strategies include: reducing sodium to under 2,300mg/day (ideally 1,500mg), regular aerobic exercise (150 min/week), maintaining a healthy weight, limiting alcohol, following the DASH diet (rich in fruits, vegetables, whole grains), managing stress, and getting adequate sleep. These lifestyle changes can lower BP by 5-15 points and may reduce or eliminate the need for medication.

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