Blood pressure average calculator
To average your blood pressure, add up all the top numbers and divide by how many readings you have, then do the same for the bottom numbers. The two columns are averaged separately. One reading on its own says very little. A set of readings averaged together is the thing a doctor can actually use.
Type your readings below. The maths happens in your browser and nothing is sent anywhere. Reviewed 29 August 2026.
Work out your average
Type in the readings you have. Everything happens in your browser. Your numbers are not sent anywhere, not saved, and not shared with us.
Enter at least one complete reading, both numbers, and the average appears here.
Range chart: American Heart Association, Understanding Blood Pressure Readings, last reviewed 14 August 2025.
See the whole range chart
- Normal
- Under 120 / under 80
- Elevated
- 120 to 129 / under 80
- High, stage 1
- 130 to 139 / 80 to 89
- High, stage 2
- 140 or higher / 90 or higher
- Crisis range
- Over 180 and/or over 120
How many readings should you average?
Enough that one odd morning cannot move the answer. The joint policy statement from the American Heart Association and the American Medical Association sets out a routine that home monitoring research is built on.
- Readings per sitting
- 2, at least 1 minute apart
- Sittings per day
- 2, morning and evening
- Readings per day
- 4
- The fuller picture
- 7 days, 28 readings
- The minimum
- 3 days, 12 readings
Average every reading you took. The statement warns against the "eyeball method", which means scanning a list and forming an impression instead of working out the number.
Source: American Heart Association and American Medical Association, Self-Measured Blood Pressure Monitoring at Home: A Joint Policy Statement, Circulation. 2020;142(4):e42-e63. If your doctor gave you a different routine, follow theirs. They know why they asked.
What an average does not tell you
- Whether you have high blood pressure. That is a diagnosis, it takes more than a number, and only a doctor or another health professional can make it.
- Whether a medicine is working. Home readings are one input a doctor may use. They are not the answer on their own.
- What to do next. This page will never tell you to start, stop or change anything you take.
- Whether something is an emergency. An average is a summary of the past. If a reading is very high right now, or you feel unwell, that is a different question and it is urgent.
BP Central keeps a record of readings you enter yourself. It does not measure your blood pressure and it is not medical advice. One reading at home does not diagnose anything. Only a doctor or other health professional can do that.
Tired of typing them in twice?
This page is here for the times you have a pile of readings and need one number. If you are going to do it every week, BP Central keeps the running average for you, over 7, 30 and 90 days, and writes a summary you can take to an appointment.
Tired of working this out by hand every time? BP Central keeps your 7, 30 and 90 day averages up to date as your history grows, so the number is already there when someone asks for it.
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First 10 readings free. Then $6.99 once. No subscription. iPhone.
Prefer paper? The printable log sheet has the right columns and costs nothing. Bring it back here when you need the average.
Common questions
How do you calculate average blood pressure?
Add up every systolic number and divide by how many readings you have. Do the same for the diastolic numbers. You average the two columns separately, so the answer is one average systolic over one average diastolic. You never average the two numbers together.
How many blood pressure readings should I average?
The joint statement from the American Heart Association and the American Medical Association describes two readings at least a minute apart, morning and evening. That is four a day. Seven days gives 28 readings, which is the fuller picture, and three days gives 12, which they describe as the minimum. The statement says to average all of them.
Should I throw away the first day of readings?
The AHA and AMA joint statement says to average all of your readings. Some clinical protocols do drop the first day. If your doctor gave you a protocol, follow theirs. This calculator averages whatever you enter.
Does an average blood pressure reading diagnose high blood pressure?
No. An average is arithmetic. Diagnosing high blood pressure is a clinical decision that takes your history, your other results and repeated measurement into account, and only a doctor or another health professional can make it.
Are my readings saved or sent anywhere?
No. The calculation runs in your browser. The numbers are not sent to a server, not stored, and not shared. Closing the tab clears them.
Why is my home average different from the reading at my doctor?
That difference is common enough to have names. Higher in the clinic than at home is called white coat hypertension. Normal in the clinic and higher outside it is called masked hypertension. Both are reasons a doctor may ask for a set of home readings rather than relying on one measurement in the room.