Blood pressure chart: compare systolic and diastolic values to see which adult blood pressure category a reading falls into. A reading is classified by whichever number places it in the higher category; expand a row for more detail.

2025 AHA/ACC adult categories

Blood pressure ranges by systolic and diastolic values

Use the table below for a quick comparison of common blood pressure categories and their systolic and diastolic ranges. For recommended actions, detailed explanations and guidance for each range, see our complete blood pressure chart.

How to measure blood pressure accurately at home

Small details can change the result. Follow the same routine each time so your readings are easier to compare.

quiet minutes

Rest before taking the first measurement.

Prepare

Avoid caffeine, smoking and exercise for 30 minutes. Empty your bladder and use a validated upper-arm monitor.

Sit correctly

Keep your back supported, feet flat, legs uncrossed and your bare arm supported at heart level.

Stay still

Do not talk or use your phone. Keep the cuff still while the monitor is running.

Repeat and record

Take two readings one minute apart. Record both and share your trend with your healthcare professional.

Understand the numbers

What systolic and diastolic blood pressure numbers mean

Blood pressure changes throughout the day. A pattern of careful readings is more useful than one isolated result.

120

Systolic · top number

Pressure while your heart beats

Systolic pressure reflects the force against artery walls when the heart contracts and sends blood through the body.

Diastolic · bottom number

Pressure between beats

Diastolic pressure reflects the force against artery walls while the heart relaxes and fills again.

When a reading is very high

What to do if your blood pressure is very high

For a reading above 180/120, wait at least one minute and measure again. If it remains that high, contact a healthcare professional immediately.

Hypertensive emergency

CALL 911 NOW

If the reading is higher than 180/120 and you have chest pain, shortness of breath, back pain, numbness, weakness, vision changes or difficulty speaking.

U.S.: 911 · Elsewhere, call your local emergency number.

Reading library

Most common blood pressure readings

Explore frequently searched values with their category, possible meaning and recommended next step.

Learn the essentials

Choose a suitable monitor and follow a repeatable routine for more reliable readings.

Read guide ↗

Clinical editorial team

Written and reviewed by cardiovascular specialists

TheEMTSpot content is authored or reviewed by clinicians and health educators with experience in cardiovascular care, prevention and patient education.

Cardiologist & CEO

Samuel Harrison, MD

Dr. Harrison leads TheEMTSpot with a focus on preventive heart care and clear patient education.

12+ years practice

200+ articles

Structural Heart Specialist & Scientist

Michael Rotman, MD

Interventional cardiologist at St. Michael's Hospital, Toronto, supervising clinical accuracy across the site.

10+ years cardiology

2,000+ studies reviewed

Nutritionist & Educator

Olivia Harper, RD

Registered Dietitian providing evidence-based guidance for cardiovascular nutrition and blood pressure management.

8+ years practice

150+ articles

Risk screening

What is your hypertension risk level?

Hypertension affects 1 in 3 adults and produces no symptoms in the majority of cases. The quiz below assesses your personal risk based on age, weight, lifestyle, and family history.

6 quick questions

Your risk profile

Lower risk

0 of 6 risk factors selected

This quiz is an educational screening aid, not a diagnosis. Discuss your risk factors and readings with a healthcare professional.

Quick answers

Common blood pressure questions

Clear, practical answers for home monitoring. Your clinician's advice should always take priority for your individual health.