A blood pressure of 109/70 is good. It falls squarely in the normal category, which the American Heart Association defines as below 120/80. Both your top number (systolic) and bottom number (diastolic) are well within healthy range, and readings in this zone are linked to the lowest risk of heart attack and stroke.
Where 109/70 Falls on the Chart
The 2025 AHA guidelines break adult blood pressure into four categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic with diastolic still below 80
- Hypertension Stage 1: 130 to 139 systolic or 80 to 89 diastolic
- Hypertension Stage 2: 140 or higher systolic, or 90 or higher diastolic
At 109/70, you’re not even close to the elevated threshold. The treatment goal for all adults, including those already on medication, is below 130/80. Your reading already clears that bar by a wide margin.
The Cardiovascular Benefit of Being Below 120
Lower blood pressure within the normal range correlates with fewer heart problems over time. An NHLBI-supported study tracked cardiovascular events like heart attacks and strokes over 10 years and found a clear pattern: among people with systolic readings of 120 to 129, about 8.3 per 1,000 had a cardiovascular event. That number dropped to 4.5 per 1,000 for readings of 110 to 119, and to 4 per 1,000 for readings of 100 to 109.
Your systolic reading of 109 sits right at the boundary between those two lowest-risk groups. In practical terms, your heart and blood vessels are under less strain than someone whose reading is technically still “normal” at 125.
What Your Diastolic Number of 70 Means
The bottom number reflects the pressure in your arteries between heartbeats, when blood flows into the small vessels that feed the heart muscle itself. A diastolic reading of 70 is healthy for most people. Research from Harvard Health has found that diastolic pressures below 70 can be associated with increased risk of heart attack and heart failure, but that concern applies mainly to people who already have heart disease or clogged coronary arteries. At exactly 70, you’re right at a comfortable floor.
If you have no history of heart disease, a diastolic of 70 is not a concern at all. If you do have heart disease and your diastolic regularly dips below 70, that’s worth mentioning to your doctor.
When a Normal Reading Could Still Be Too Low
Blood pressure isn’t just about the number on the cuff. Most clinicians consider blood pressure “too low” only when it causes symptoms. A reading of 109/70 is unlikely to cause problems, but if you’re someone whose blood pressure normally runs around 130 and it suddenly drops to 109, that 20-point shift could leave you feeling lightheaded or faint.
Signs that your blood pressure may be too low for you personally include:
- Dizziness or lightheadedness, especially when standing
- Blurred or fading vision
- Fatigue or trouble concentrating
- Fainting
- Nausea
If you feel fine at 109/70, there’s nothing to worry about. Many people, particularly those who exercise regularly, naturally run in this range. Research on adult athletes shows that regular training lowers resting blood pressure by about 3 to 4 points on average, and female athletes in endurance and dynamic sports commonly have systolic readings between 112 and 120 with diastolic values in the low 70s.
Making Sure Your Reading Is Accurate
A single blood pressure reading is a snapshot, not a diagnosis. If you took this measurement at home and want to make sure it’s reliable, the CDC recommends a specific protocol. Sit in a chair with your back supported for at least five minutes before measuring. Keep both feet flat on the floor, legs uncrossed, and rest the cuffed arm on a table at chest height. Don’t eat, drink caffeine or alcohol, smoke, or exercise within 30 minutes of the reading. Don’t talk while the cuff is inflating.
Take at least two readings one to two minutes apart. If the numbers are close, you can feel confident in the result. If they differ by more than a few points, take a third. Caffeine, a full bladder, or even sitting with crossed legs can push readings higher than your true resting pressure, so a calm, consistent setup matters.
What to Do With a Good Reading
If 109/70 is your typical blood pressure, you’re in an excellent position. The most useful thing you can do is keep it there. Blood pressure tends to rise with age, weight gain, increased sodium intake, and decreased physical activity. Staying active, keeping a reasonable weight, and not overdoing salt are the simplest ways to maintain the reading you have now rather than chasing it later with medication.
Checking your blood pressure a few times a year gives you a baseline to notice changes early. A reading that creeps from 109 to 125 over a couple of years isn’t alarming on its own, but it tells you something is shifting before it becomes a problem.