A blood pressure of 110/66 is a good reading. It falls well within the normal category, which is defined as anything below 120/80 mm Hg. Both your top number (systolic) and bottom number (diastolic) are comfortably in the healthy range, and this reading is associated with lower long-term cardiovascular risk.
Where 110/66 Falls on the Chart
The American Heart Association and American College of Cardiology classify blood pressure into five main categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic and below 80 diastolic
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140+ systolic or 90+ diastolic
- Severe hypertension: above 180 systolic or above 120 diastolic
At 110/66, both numbers sit solidly in the normal range. You’re 10 points below the threshold where blood pressure starts being classified as “elevated” and 20 points below Stage 1 hypertension. The recommended action for a normal reading is simply to maintain a healthy lifestyle.
What the Two Numbers Mean
The first number, 110, is your systolic pressure. It measures the force of blood pushing against your artery walls each time your heart beats. The second number, 66, is your diastolic pressure, which measures that same force between beats while your heart is filling with blood. Both numbers matter, though systolic pressure becomes a more important predictor of heart disease risk after age 50 as arteries naturally stiffen and plaque builds up over time.
Is 110/66 Too Low?
No. Low blood pressure, called hypotension, is generally defined as a reading below 90/60 mm Hg. Your reading of 110/66 is well above that threshold. Even readings that technically qualify as “low” only require attention if they cause symptoms like dizziness, fainting, blurred vision, fatigue, or trouble concentrating. If you feel fine, a lower reading within the normal range is typically a sign of good cardiovascular health.
What can be dangerous is a sudden drop in blood pressure. A fall of just 20 points in systolic pressure, say from 110 down to 90, can cause dizziness or fainting. This sometimes happens when standing up quickly, becoming dehydrated, or after a heavy meal. The reading itself isn’t the concern in those cases. The speed of the change is.
Your Pulse Pressure Is Healthy Too
Pulse pressure is the gap between your two numbers. For a reading of 110/66, that’s 44 mm Hg. A healthy pulse pressure is around 40 mm Hg, and values consistently above 40 can sometimes signal stiffer arteries. At 44, yours is close to the textbook ideal and not a cause for concern.
What This Means for Long-Term Health
Keeping blood pressure in the range you’re at now is one of the most protective things for your heart and blood vessels over time. A major clinical trial called SPRINT, which followed over 9,300 adults aged 50 and older, found that people who maintained blood pressure below 120/80 had a 25% lower risk of heart attack, stroke, or cardiovascular death compared to those who only brought their numbers below 140/90. They also had 27% fewer deaths from any cause over the three-year study period.
The updated 2025 guidelines from the AHA and ACC set a treatment goal of below 130/80 for all adults on blood pressure medication. Your reading of 110/66 is already well below that target, which puts you in a favorable position whether or not you have other risk factors.
Keeping Your Blood Pressure in This Range
Blood pressure doesn’t stay fixed. It fluctuates throughout the day based on activity, stress, caffeine, sleep, and dozens of other factors. A single reading of 110/66 is encouraging, but the pattern over time matters more than any one measurement. Taking readings at the same time of day, sitting quietly for five minutes beforehand, and using a properly sized cuff all help you get consistent numbers.
The lifestyle factors that keep blood pressure in the normal range are the ones you’d expect: regular physical activity, a diet rich in fruits, vegetables, and whole grains, limited sodium intake, moderate alcohol consumption, maintaining a healthy weight, and managing stress. These aren’t just prevention strategies. They’re the reason many people have readings like yours in the first place.