Blood Pressure Category Calculator
Reads your systolic and diastolic numbers and tells you which standard blood pressure category they fall into, from low to hypertensive crisis.
Recent
Formula
How the calculation works
Enter the systolic number, which is the higher figure your monitor shows first when the reading finishes.
Enter the diastolic number, the lower figure, and your pulse if you have it so the log stays complete.
The tool takes the worse of the two categories your numbers fall into and returns that band, because blood pressure is graded by whichever value is higher.
Common mistakes
- Judging the category from the systolic alone, when the diastolic can place a reading in a higher band entirely on its own.
- Treating one high reading as a diagnosis, since stress, coffee or a rushed measurement can lift a single reading well above your usual level.
When to use it
- Use it to understand a home reading before your next check-up, so you can tell your doctor whether a number has stayed in the same band.
- Use it to track a trend over several days, since one high reading on its own is far less meaningful than a steady pattern.
Worked example
A reading of 135 over 85 falls into stage 1 hypertension, because the systolic sits in the 130 to 139 range and the diastolic in the 80 to 89 range.
Common questions
Does one high reading mean I have hypertension?
No, a single reading is not a diagnosis, and doctors usually confirm with repeated measurements on different days before labelling high blood pressure.
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