What does my blood pressure reading mean?
Enter the two numbers from your monitor to see which category they fall in. Below the checker, we explain the readings people search for most, from 120/80 to 160/100.
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The five categories
A blood pressure reading has two numbers. The top one, systolic, is the pressure in your arteries when your heart beats. The bottom one, diastolic, is the pressure between beats. Both are measured in millimetres of mercury (mmHg).
| Category | Systolic | Diastolic | |
|---|---|---|---|
| Normal | Under 120 | and | Under 80 |
| Elevated | 120–129 | and | Under 80 |
| Stage 1 hypertension | 130–139 | or | 80–89 |
| Stage 2 hypertension | 140 or higher | or | 90 or higher |
| Severe | Higher than 180 | and/or | Higher than 120 |
When the two numbers land in different categories, the higher one counts. That's why 125/85 is stage 1, not elevated: the diastolic number decides it.
Common readings explained
120/80
Often called "perfect", but under the current guideline a diastolic of exactly 80 puts it in stage 1. Normal is below 120/80. A home average right at 120/80 isn't a cause for alarm, but it's worth knowing which side of the line you're on.
120/90
Stage 2, because the diastolic is 90. A high bottom number with a normal top number is called isolated diastolic hypertension. It's more common in younger adults and is worth raising with your doctor if your average stays there.
130/70 and 130/80
Both are stage 1: the systolic of 130 is enough on its own. 130/80 is the threshold the 2025 guideline uses for high blood pressure, for home averages as well as clinic readings.
135/85 and 138/80
Stage 1. At this level, doctors usually look at your overall cardiovascular risk and your home average over a week before deciding between lifestyle changes alone and medication.
140/90
Stage 2. Either number alone (140 systolic or 90 diastolic) is enough. If your home average is at or above 140/90, book an appointment rather than waiting for your next routine check-up.
150/90 and 145/90
Stage 2. A single reading like this after coffee or a rush up the stairs is common. Sit quietly for five minutes and measure again. If your readings over several days stay here, talk to your doctor soon.
160/100
Stage 2, well above the threshold. Repeated readings at this level need medical attention within days, not months. If you already take blood pressure medication, let your prescriber know.
180/120 and higher, like 200/100
A systolic above 180 or a diastolic above 120 is severe hypertension. 200/100 counts because of the top number.
Wait a minute and measure again. If it's still above 180/120 and you have chest pain, shortness of breath, back pain, numbness or weakness, a change in vision or difficulty speaking, call 911 or your local emergency number. Without symptoms, contact your doctor the same day.
90/60 and 80/50
There's no "low" category in the hypertension guideline. Readings around 90/60 or below are generally considered low blood pressure. That's often harmless, especially in fit people. It matters when it comes with symptoms; see low readings below.
Why one reading isn't a diagnosis
Blood pressure moves all day. It's higher in the morning, after caffeine, when you're stressed, talking, cold or need the bathroom, and it can swing by 10 or 20 points within an hour. One reading is a snapshot.
That's why the 2025 guideline bases decisions on averages: several readings in the clinic over at least two visits, or a week of home readings taken morning and evening. Our free printable 7-day log is set up for exactly that, and this guide explains why your numbers jump around.
Low readings
Low blood pressure only needs attention if it causes symptoms. Contact your doctor if low readings come with:
- dizziness or light-headedness, especially when you stand up
- fainting or nearly fainting
- blurred vision, nausea, confusion or unusual tiredness
If you take blood pressure medication and your readings are often low, don't stop or change the dose yourself; ask your prescriber.
Sources
- American Heart Association: Understanding blood pressure readings
- American Heart Association: Top things to know: 2025 high blood pressure guideline
- Centers for Disease Control and Prevention: About high blood pressure