Perfect blood pressure is generally considered to be below 120/80 mmHg. The most recent European cardiology guidelines from 2024 define “non-elevated” blood pressure as a systolic reading (the top number) under 120 and a diastolic reading (the bottom number) under 70. In practice, a reading somewhere around 110/70 to 115/75 is what most clinicians would call ideal for an adult, though there’s a healthy range rather than a single magic number.
What the Two Numbers Mean
Blood pressure is always written as two numbers separated by a slash. The top number, systolic pressure, measures the force your blood pushes against artery walls each time your heart beats. The bottom number, diastolic pressure, measures that same force between beats, when the heart is relaxed and refilling with blood. Both numbers matter, and both need to stay within a healthy range.
The Ranges That Matter
The 2024 European Society of Cardiology guidelines simplified blood pressure into three buckets:
- Non-elevated: systolic below 120 and diastolic below 70
- Elevated: systolic 120 to 139 or diastolic 70 to 89
- Hypertension: systolic 140 or higher, or diastolic 90 or higher
The American Heart Association uses a slightly different framework, with “normal” defined as below 120/80 and “elevated” starting at 120 to 129 systolic. Either way, the sweet spot sits below 120 systolic. That said, blood pressure can be too low. A reading below 90/60 is considered hypotension, and it can cause dizziness, fainting, and fatigue. So “perfect” really means somewhere between 90/60 and 120/70, with no symptoms.
Why 120 Keeps Coming Up
A large clinical trial called SPRINT tested whether pushing systolic blood pressure below 120 was actually better than the older target of below 140. The results were striking: aiming for the lower target reduced heart attacks, heart failure, and strokes by 25% and cut overall death risk by 27%. That trial involved adults 50 and older with at least one cardiovascular risk factor (though not diabetes or prior stroke), and its findings drove much of the shift toward tighter blood pressure goals in recent guidelines.
For people already on blood pressure medication, the 2024 European guidelines now recommend a treatment target of 120 to 129 systolic and 70 to 79 diastolic, as long as the medication is well tolerated. If that range causes side effects like lightheadedness, the goal shifts to “as low as reasonably achievable.”
How Age and Health Conditions Shift the Target
Children don’t use the same thresholds as adults. Their healthy blood pressure depends on age, sex, and height, and pediatricians compare a child’s reading against percentile charts rather than fixed numbers. A reading that’s normal for a 15-year-old would look different from one that’s normal for a 6-year-old.
Certain chronic conditions also change the math. Adults with diabetes and kidney disease have historically been given a target below 140/90. When kidney disease involves significant protein leakage in the urine, some guidelines suggest aiming closer to 130/80, though the evidence behind that tighter target is considered weak. Your specific target depends on your overall health picture, not just a single chart.
Your Reading Is Only as Good as Your Technique
A single high or low reading doesn’t necessarily mean anything. Blood pressure fluctuates throughout the day based on stress, caffeine, posture, and even conversation. To get a number you can trust, the CDC recommends a specific protocol: avoid food and drinks for 30 minutes beforehand, empty your bladder, and sit quietly with your back supported for at least five minutes before measuring. Both feet should be flat on the floor, legs uncrossed, and your arm should rest on a surface at chest height. The cuff goes on bare skin, not over a sleeve. And don’t talk during the reading.
Small deviations from this routine can push your numbers up by 5 to 15 points. Many people who think they have elevated blood pressure are simply measuring under non-ideal conditions: rushing, talking, sitting on an exam table with feet dangling, or using a cuff that’s too small. If your home readings consistently look different from what you see at the doctor’s office, technique is the most likely explanation.
When Low Blood Pressure Becomes a Problem
Most of the attention goes to high blood pressure, but the lower end of the range matters too. Hypotension is defined as a reading below 90/60. Some people naturally run low and feel perfectly fine, which isn’t a concern. It becomes a problem when it causes symptoms: dizziness when standing, blurred vision, nausea, or fainting. One specific form, orthostatic hypotension, occurs when your blood pressure drops more than 20 points systolic or 10 points diastolic within three minutes of standing up. That type is more common in older adults and can increase fall risk.
So while lower is generally better when it comes to blood pressure, “perfect” has a floor. If you’re consistently below 90/60 and feeling lightheaded or unusually fatigued, that reading isn’t ideal for you, regardless of what any chart says.