Blood Pressure Calculator

Enter your blood pressure reading and get your classification, health risk level, and personalised guidance based on AHA/ESC guidelines.

Please enter valid systolic and diastolic values.

CategorySystolicDiastolic
Normal< 120< 80
Elevated120–129< 80
High (Stage 1)130–13980–89
High (Stage 2)≥ 140≥ 90
Hypertensive Crisis> 180> 120

What Is Blood Pressure?

Blood pressure measures the force of blood pushing against artery walls as the heart pumps. It is recorded as two numbers: systolic pressure (the higher number) measures pressure when the heart beats; diastolic pressure (the lower number) measures pressure between beats. It is expressed in millimetres of mercury (mmHg).

Why Blood Pressure Matters

High blood pressure (hypertension) is the leading risk factor for heart attack, stroke, kidney disease, and heart failure worldwide. It is often called the “silent killer” because it typically causes no symptoms until serious damage has occurred. Approximately 1.28 billion adults worldwide have hypertension, and nearly half are unaware of it.

Lifestyle Changes That Lower Blood Pressure

Evidence-based strategies include: the DASH diet (rich in fruits, vegetables, whole grains, and low-fat dairy); reducing sodium intake to under 2,300mg/day; regular aerobic exercise (30 minutes most days); limiting alcohol; quitting smoking; achieving a healthy weight; and managing stress. These changes can reduce systolic blood pressure by 5–20 mmHg each, making a combined lifestyle approach highly effective.

Frequently Asked Questions

What is normal blood pressure?
Normal blood pressure is below 120/80 mmHg, according to the American Heart Association. The optimal level is around 115/75 mmHg — cardiovascular risk doubles with each 20/10 mmHg increment above this.
How should I take my blood pressure at home?
Sit quietly for 5 minutes before measuring; avoid caffeine and exercise for 30 minutes prior; keep feet flat on the floor; support your arm at heart height; take two readings 1 minute apart and average them. Morning readings (before medication if applicable) are most informative.
Does blood pressure fluctuate throughout the day?
Yes — it is naturally lowest during sleep, rises sharply on waking, peaks in the morning and again in the afternoon, and drops in the evening. Single readings are less informative than a pattern of readings over days or weeks.
Medical Disclaimer: This calculator is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for health decisions.