Optimum blood pressure is below 120/80 mmHg. Both the American Heart Association and the European Society of Cardiology agree on this threshold, with the European guidelines explicitly using the term “optimal” for readings under 120 systolic and under 80 diastolic. That said, there’s a floor: blood pressure below 90/60 mmHg is generally considered too low, so the sweet spot sits between those two markers.
What the Two Numbers Mean
The top number (systolic) measures the pressure in your arteries when your heart beats. The bottom number (diastolic) measures the pressure between beats, when your heart is resting. Both matter, but systolic pressure gets more attention because it’s a stronger predictor of heart attack and stroke, especially as you age.
A reading of 115/75 is optimal. So is 108/68. You don’t need to hit a single magic number. You’re looking for a range where your cardiovascular system isn’t under excess strain but your brain and organs are still getting adequate blood flow.
How Blood Pressure Categories Break Down
The 2025 American Heart Association and American College of Cardiology guidelines classify adult blood pressure into four categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic with diastolic still below 80
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
If your systolic and diastolic readings fall into two different categories, the higher category applies. So a reading of 135/75 counts as stage 1 hypertension even though the bottom number looks fine.
European guidelines split the zone between 120/80 and 140/90 slightly differently, distinguishing “normal” (120 to 129 systolic, 80 to 84 diastolic) from “high normal” (130 to 139 systolic, 85 to 89 diastolic). But the take-home message is the same: below 120/80 is where you want to be.
Why Every 10 Points Matters
The relationship between blood pressure and cardiovascular risk is remarkably linear. A meta-analysis of large clinical trials found that lowering systolic blood pressure by just 10 mmHg reduces the risk of major cardiovascular events, including heart attack, stroke, and heart failure, by about 20%. Even a 5 mmHg reduction cuts that risk by roughly 10%. These reductions hold whether you start at 150 or 130.
This is why the “elevated” category (120 to 129) isn’t treated casually even though it falls short of a hypertension diagnosis. It signals that your risk is climbing and that lifestyle changes can make a measurable difference before medication enters the picture.
When Low Blood Pressure Becomes a Problem
Blood pressure below 90/60 mmHg is classified as hypotension. Some people naturally run low and feel perfectly fine at 95/60. It only becomes a concern when it causes symptoms: dizziness, lightheadedness, fainting, blurred vision, or fatigue. These symptoms typically mean your brain isn’t getting enough blood flow, and they tend to be worst when you stand up quickly.
So optimal blood pressure has a practical floor. If your readings consistently sit below 90/60 and you’re symptomatic, that’s worth investigating, even though lower is generally better in the context of heart disease prevention.
Targets for Older Adults
For decades, doctors accepted higher blood pressure in older patients, often tolerating systolic readings up to 150. That thinking has shifted. A large randomized trial of patients aged 60 to 80 with hypertension compared an intensive target (systolic below 130) to a standard target (systolic below 150). Over about three years of follow-up, the intensive group had 26% fewer cardiovascular events. Stroke risk dropped by 33%, and acute coronary events fell by a similar margin.
The takeaway: older adults benefit from tighter blood pressure control, not looser. A systolic target below 130 is now widely recommended for most people over 60, though the exact approach depends on how well someone tolerates treatment and whether they experience side effects like dizziness from lower readings.
Targets With Diabetes or Kidney Disease
If you have diabetes, chronic kidney disease, or both, the recommended target is typically a systolic reading below 130 mmHg. International guidelines have converged on this number after pooled analyses showed that keeping systolic pressure below 130 in people with kidney disease reduced both cardiovascular events and overall mortality compared to the older target of below 140. For people with kidney disease who also have protein in their urine (a sign of kidney damage), some guidelines push the target even lower, to below 120 mmHg.
Getting an Accurate Reading
Your blood pressure varies throughout the day, reacts to stress, and can spike in a clinical setting. To get a number that actually reflects your cardiovascular health, the measurement conditions matter more than most people realize.
Sit in a chair with your back supported and feet flat on the floor. Rest quietly for three to five minutes before the first reading, with no talking or scrolling your phone. The cuff should go on bare skin, not over a sleeve, and your arm should be supported at heart level. If you’re holding your arm up yourself, that alone can raise the reading. Seated measurements are preferred because most of the data linking blood pressure to health outcomes comes from readings taken in this position.
A single reading also isn’t definitive. About 9% of the general population has what’s called masked hypertension: their readings look normal in the clinic but run high at home. Another 3 to 4% have the opposite pattern, called white coat hypertension, where clinical readings are elevated but home readings are normal. Among people already diagnosed with high blood pressure, white coat effects show up in roughly 13% of patients. Home monitoring with a validated cuff, or 24-hour ambulatory monitoring, gives a much clearer picture of your true average pressure.
Your Blood Pressure at Night
Blood pressure naturally dips by 10% to 20% while you sleep. This overnight drop, called “dipping,” is a healthy sign that your cardiovascular system is recovering. People whose pressure doesn’t dip enough at night, or whose pressure actually rises during sleep, face higher cardiovascular risk even if their daytime numbers look fine. This is one reason 24-hour monitoring can reveal problems that office readings miss entirely.