Blood pressure average calculator
Enter readings from your cuff. The page shows the overall average, a morning average, and an evening average. Nothing is uploaded.
Blood pressure averages
Thirty-one readings fit here. A longer stretch belongs in the log you keep every day.
Add at least one complete reading. A row needs both numbers.
- Readings
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- Overall average
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- Morning average
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- Evening average
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- Pulse average
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- Highest
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- Lowest
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At least one reading is higher than 180 systolic and/or higher than 120 diastolic. That reading needs attention even when the average looks calmer. Contact a clinician now, and follow the AHA emergency guidance.
Rows left out:
Averages are the arithmetic mean, shown to one decimal. The chart label uses that average rounded to the nearest whole mmHg. It is not a diagnosis.
What gets averaged
The overall figure is the arithmetic mean: add the systolic numbers and divide by how many complete readings you included, then do the same for diastolic. Morning and evening are averaged only from rows you marked that way. “Not specified” still counts in the overall average and the pulse average, and it stays out of the morning and evening split.
Highest and lowest follow the systolic number. Pulse is averaged only across rows where you typed a pulse.
What to leave out
A reading you already know was botched — cuff over a sleeve, talking the whole time, taken the second you sat down — should not be in the average. This page will not drop a high number for you. If the diastolic number is not lower than the systolic number, or a box is only half filled, that row is left out and counted under “rows left out.”
An average can hide one bad reading
The chart label uses the American Heart Association adult cutoffs on the average, after rounding to the nearest whole mmHg. That is a label for the chart, not a diagnosis. One reading in the crisis range can sit inside a calmer average. If any row is over 180 systolic or over 120 diastolic, deal with that row on its own.
The chart label uses published adult categories, not a personal target: Understanding Blood Pressure Readings (AHA) · 2025 AHA/ACC high blood pressure guideline
Questions about averaging blood pressure
How many blood pressure readings should I average?
Two weeks of morning and evening readings is a common request before a visit. The calculator will average any list you type, including a single row. One row is not a pattern.
Should morning and evening be averaged together?
Keep both. The overall average is useful, and the split is useful. A wide gap between morning and evening is something to show a clinician. This page will not name that gap as a condition.
Do you store the readings I type?
No. The math runs in the browser. Refreshing or closing the page clears the list.
Why was a row left out?
Both numbers have to be present, diastolic has to be lower than systolic, and both have to sit in a range a home cuff can display (systolic 50–300, diastolic 30–200). Pulse, if you enter it, has to fall between 30 and 220.