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Blood Pressure Checker

Check which blood pressure category your reading falls in — normal, elevated, stage 1, stage 2 or crisis — and what to do next.

A blood pressure reading has two numbers, such as 120/80 mmHg. The top number, systolic pressure, is the pressure in your arteries when your heart beats; the bottom number, diastolic pressure, is the pressure between beats. High blood pressure usually causes no symptoms, yet over years it raises the risk of heart attack, stroke and kidney disease — which is why it is worth knowing your numbers.

Enter your reading and this checker shows which category it falls in under the 2017 American College of Cardiology and American Heart Association guideline, what that means, and sensible next steps. Because single readings vary, you can enter up to three readings and the checker uses their average. Nothing you enter is stored or sent.

How to use Blood Pressure Checker

  1. Sit quietly for five minutes and take your reading.
  2. Enter the systolic (top) and diastolic (bottom) numbers.
  3. Optionally add a second and third reading taken a minute apart.
  4. Read the category and what to do next.

Features

  • Category under the 2017 ACC/AHA adult guideline.
  • Average of up to three readings.
  • Pulse pressure.
  • Next steps for each category, with crisis warning signs.
  • Note for low blood pressure.
  • Runs in your browser; nothing is stored or sent.

Blood pressure categories

The category is set by whichever number is higher. For example, 125/85 counts as stage 1 because the diastolic number is in the stage 1 range, even though the systolic number alone would be elevated.

CategorySystolic (top)Diastolic (bottom)
Normalunder 120and under 80
Elevated120–129and under 80
High blood pressure — stage 1130–139or 80–89
High blood pressure — stage 2140 or higheror 90 or higher
Hypertensive crisisover 180and/or over 120

Measuring correctly

Readings vary through the day and are easily pushed up by stress, caffeine, exercise, a full bladder or talking. For a reliable reading, avoid caffeine and exercise for 30 minutes, sit with your back supported and feet flat on the floor for five minutes, and rest your arm at heart level. Use a validated upper-arm monitor with the right cuff size on bare skin. Take two or three readings a minute apart and use the average — this checker does that for you. Doctors diagnose high blood pressure from averages over several days, not from one reading, and some guidelines, such as those used in Europe, set slightly different thresholds.

What to do next

With a normal reading, keep up healthy habits and check at routine visits. With elevated blood pressure, lifestyle changes — less salt, more physical activity, a healthy weight, less alcohol, not smoking and a diet rich in vegetables, fruit and whole grains — can bring it down. Stage 1 and stage 2 readings should be discussed with a doctor or nurse, who will confirm them and may recommend medicine alongside lifestyle changes. A reading over 180/120 needs a recheck after five minutes; if it is still that high, contact a doctor straight away, and call emergency services if you also have chest pain, shortness of breath, back pain, numbness or weakness, changes in vision or difficulty speaking.

Low blood pressure and pulse pressure

Readings under 90/60 are considered low. For many healthy people this is normal and harmless, but dizziness, fainting, blurred vision or confusion with low readings should be checked by a doctor. Pulse pressure — the difference between the two numbers — is usually around 40 to 60 mmHg in adults; a consistently wide pulse pressure in older adults can reflect stiffer arteries. These categories are for adults; children's blood pressure is judged against charts for their age, sex and height.

Frequently asked questions

What is normal blood pressure?

Under 120 systolic and under 80 diastolic, according to the 2017 ACC/AHA guideline.

Is 130/80 high blood pressure?

Under the ACC/AHA guideline it is stage 1 high blood pressure. Confirm it with several readings.

Which number matters more?

Both. The higher category of the two numbers sets your category.

Why should I take several readings?

Single readings vary; the average of two or three is more reliable.

When is blood pressure an emergency?

Over 180/120 with symptoms such as chest pain, shortness of breath, weakness or vision changes — call emergency services.

Is my data stored?

No. The check runs in your browser.

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