Blood Pressure Average Calculator (Up to Three Readings)

One blood pressure reading is a snapshot, and a noisy one. The same arm can read ten points apart a minute later, and the first squeeze of the cuff is often the highest of the set.
That is why guidelines stage blood pressure on an average: two or more readings, taken properly, on two or more occasions.

How this page works

Enter up to three readings taken a minute or two apart. The page averages the systolic numbers and the diastolic numbers separately, rounds each to a whole number, and stages the average on the table below.
Each reading is staged on its own as well, so you can see when they fall in different categories. That is common, and it is exactly why the average is the number that counts.

There are two things it will not let an average hide. A single reading above 180/120 is flagged whatever the average says, because a reading like that is not something to average away.
And with three readings it also shows the average of the last two. The European Society of Hypertension records office blood pressure that way, dropping the first reading, and the panel says so when dropping it changes your category.

The categories (AHA and ACC, 2017, kept in the 2025 guideline)

Below 90/60 is usually called low blood pressure. It is not one of the AHA categories, and it matters only when it comes with dizziness, fainting or blurred vision.

Home numbers are judged on home values

The categories were written for readings taken in a clinic, where most people read higher than they do at home. So the guideline publishes matching home values, and they part company at Stage 2:

A home average of 136/82 is therefore Stage 2, where the same numbers in a clinic would be Stage 1. Pick “At home” in the menu and the page moves the Stage 2 line to 135/85. Everything else stays where it is.

A week of home readings

The protocol most doctors want is two readings in the morning, before medication and coffee, and two in the evening, every day for a week. The European protocol drops the first day, since readings settle once you are used to the cuff.
Average each session here and write it down with the date. A list of dated averages tells a doctor far more than a single figure, and it is what they use to tell real hypertension from the white coat kind.

Before each session, sit with your back supported and your feet flat for five minutes, cuff on bare skin at heart level, and stay quiet. Talking during a reading adds several points, and so does a full bladder.

For one reading on its own, the blood pressure category checker is quicker.