Optimal blood pressure is below 120/80 mmHg. That’s the reading where your risk of heart disease, stroke, and other cardiovascular problems is at its lowest. Both the American Heart Association and the Mayo Clinic categorize this as “normal” blood pressure, and it’s the target most people should aim for.
What the Numbers Mean
A blood pressure reading has two numbers. The top number (systolic) measures the pressure in your arteries when your heart beats. The bottom number (diastolic) measures pressure between beats, when your heart is resting. Both matter, and both need to fall below their respective thresholds for a reading to be considered optimal.
The American Heart Association breaks 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
European guidelines, updated in 2024 by the European Society of Cardiology, draw the line slightly differently. They define “non-elevated” blood pressure as below 120/70 (note the lower diastolic cutoff of 70 rather than 80), place “elevated” at 120 to 139 systolic or 70 to 89 diastolic, and don’t diagnose hypertension until 140/90. So while the American system flags you at 130/80, European guidelines give a bit more room before calling it high blood pressure. The optimal zone, though, is essentially the same: under 120 systolic.
Why 120 Matters So Much
The strongest evidence for targeting a systolic pressure below 120 comes from a major clinical trial called SPRINT, conducted by the National Heart, Lung, and Blood Institute. The study enrolled adults aged 50 and older with high blood pressure and at least one additional risk factor for heart disease. Compared with the traditional treatment target of below 140, pushing systolic pressure below 120 reduced heart attacks, strokes, and heart failure by 25% and lowered the overall risk of death by 27%.
Reaching that lower target required more effort. Participants aiming for below 120 needed an average of three blood pressure medications, while those targeting below 140 needed two. But the cardiovascular benefits were substantial enough that guidelines shifted in response, and below 120 became the gold standard for optimal.
Optimal Targets for Older Adults
For years, many physicians accepted higher blood pressure in older patients, sometimes allowing systolic readings up to 150 in people over 65. The thinking was that aggressive treatment caused too many side effects like dizziness and falls. That view is changing.
A 2025 review analyzed four randomized trials involving more than 3,600 people aged 75 and older. Targeting a systolic pressure below 130 (the more aggressive approach) reduced cardiovascular events by 39% and cardiovascular-related deaths by 45% compared with aiming for 130 to 150. The critical finding: rates of falls, fractures, dangerously low blood pressure, and cognitive decline were no different between the two groups. The same conclusions held when the analysis was expanded to include people 70 and older.
This doesn’t mean every older adult should have identical targets. Frailty, other health conditions, and medication tolerance all factor in. But the evidence increasingly supports keeping blood pressure well controlled even later in life.
When Blood Pressure Is Too Low
There’s a floor. A reading below 90/60 is generally considered low blood pressure, or hypotension. But the number alone isn’t the concern. Most health professionals only consider it a problem when it causes symptoms: dizziness, blurred vision, fatigue, fainting, trouble concentrating, or nausea. Some people naturally run low without any issues, and that’s fine.
Severe drops can lead to shock, which involves confusion, cold and clammy skin, rapid shallow breathing, and a weak pulse. This is a medical emergency, but it’s very different from someone who simply has a resting pressure of 100/65 and feels perfectly well.
Getting an Accurate Reading
Your blood pressure can swing by 10 to 20 points depending on how you measure it, so technique matters a lot. A single high reading at the doctor’s office doesn’t necessarily mean you have hypertension, and a single normal reading at home doesn’t guarantee you’re in the clear.
For the most reliable results, sit quietly for three to five minutes before taking a measurement. Don’t talk during the rest period or while the cuff is inflating. Avoid caffeine, exercise, and smoking for at least 30 minutes beforehand, and make sure your bladder is empty (a full bladder can raise your reading).
Arm position is another common source of error. Your upper arm should be supported on a surface like a desk, with the middle of the cuff at heart level. If your arm hangs down at your side, the reading will come in artificially high. Don’t hold your arm up yourself either, because the muscle tension from holding it there also skews results.
Cuff size is one of the most overlooked factors. A cuff that’s too small gives a falsely high reading, while one that’s too large reads artificially low. The cuff should go on bare skin, not over a rolled-up sleeve, which can act like a tourniquet. You should be able to slip one finger under the top and bottom edges of the cuff, but two fingers should feel snug.
Lifestyle Changes That Lower Blood Pressure
If your blood pressure is in the elevated or stage 1 range, lifestyle adjustments can sometimes bring you back to optimal without medication. The effects are real and measurable.
The biggest dietary impact comes from the DASH eating pattern: heavy on fruits, vegetables, whole grains, and low-fat dairy, while cutting back on saturated fat and cholesterol. This approach alone can lower systolic blood pressure by up to 11 mmHg. Reducing sodium intake to 1,500 mg per day (roughly two-thirds of a teaspoon of table salt) can drop it another 5 to 6 mmHg. For context, most people consume well over 3,000 mg daily.
Weight loss has a roughly linear effect. Each kilogram lost (about 2.2 pounds) lowers systolic pressure by approximately 1 mmHg. So someone who loses 10 kilograms, or around 22 pounds, could see a 10-point drop. Combined with dietary changes, these numbers start to add up quickly, potentially moving someone from stage 1 hypertension back into the normal range.
Regular aerobic exercise, limiting alcohol, and managing stress also contribute, though their effects are harder to pin to a single number. The key takeaway is that blood pressure is one of the most modifiable risk factors for heart disease, and optimal isn’t just a number to know. It’s a number worth working toward.