Blood pressure average calculator

Type in your readings to get your average blood pressure. Works for 2 or 3 readings in one sitting, or a whole week of morning and evening readings.

How the average is worked out

The calculator adds up all the top numbers and divides by the number of readings, then does the same for the bottom numbers. Each is rounded to the nearest whole number. A row is only counted when it has both numbers.

For example, three readings of 132/84, 128/80 and 127/82 give an average of 129/82: (132 + 128 + 127) ÷ 3 = 129, and (84 + 80 + 82) ÷ 3 = 82.

Why use an average?

Blood pressure changes from minute to minute and through the day, so one reading can be misleading. That is why the American Heart Association advises taking two readings one minute apart each time, and why doctors usually look at many home readings together.

If your doctor asked for a week of home readings, the UK's NICE guideline describes this routine:

• two readings at least 1 minute apart, sitting down;
• twice a day, ideally in the morning and evening;
• for at least 4 days, ideally 7;
• then leave out the first day's readings and average all the rest.

To do that here, simply don't type in day 1. A 7-day log with room for 2 readings each time makes it easy to collect them.

What does my average mean?

The calculator shows which row of the AHA/ACC 2025 and ESC 2024 category tables your average falls in, for information only. Home readings are often a little lower than readings at the clinic, and some guidelines use lower thresholds for home averages, so ask your doctor how to read your numbers. Only a health care professional can diagnose high blood pressure.

Sources

• National Institute for Health and Care Excellence (NICE). Hypertension in adults: diagnosis and management (NG136), recommendation 1.2.7.
• American Heart Association. Monitoring your blood pressure at home. Last reviewed August 14, 2025.
• Category tables: 2025 AHA/ACC High Blood Pressure Guideline, Table 4; 2024 ESC Guidelines for the management of elevated blood pressure and hypertension.

Updated November 3, 2026