A blood pressure of 116/66 falls squarely in the normal range. Under current guidelines from the American Heart Association and American College of Cardiology, normal blood pressure is anything below 120/80 mmHg. Both your top number (116) and bottom number (66) clear that threshold, so this is a healthy reading.
What the Two Numbers Mean
The top number, 116, is your systolic pressure. It measures the force inside your arteries each time your heart beats and pushes blood out. The bottom number, 66, is your diastolic pressure, which reflects the pressure in your arteries between beats, when your heart is resting and refilling. Together, they give a snapshot of how hard your cardiovascular system is working.
Where 116/66 Fits in the Categories
The 2025 AHA/ACC 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
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
At 116/66, you’re comfortably in the normal category. You’re also well above the threshold for low blood pressure (hypotension), which is generally defined as a reading below 90/60.
A Note on Your Diastolic Number
While 66 is technically normal, diastolic readings in the 60s have gotten some attention in research. A large study tracking over 11,000 adults for three decades found that people with diastolic pressure between 60 and 69 were twice as likely to show subtle signs of heart damage compared to those in the 80 to 89 range. Low diastolic values were also linked to higher long-term risk of heart disease and death over a 21-year follow-up period. A separate analysis of more than 31,000 adults found that diastolic pressures below 70 were associated with increased risk of heart attack and hospitalization for heart failure.
That said, these studies largely focused on older adults and people who already had cardiovascular disease or diabetes. For a younger, otherwise healthy person, a diastolic reading of 66 is not alarming. It becomes more worth watching if you’re over 55, have existing heart disease, or if the number trends downward over time.
Your Pulse Pressure Is Worth Knowing
Pulse pressure is simply the difference between the two numbers. Yours is 50 (116 minus 66). A healthy pulse pressure is around 40, and readings above 60 start to become a risk factor for heart disease, particularly in older adults. At 50, yours is slightly above the ideal but well below the concerning range. A pulse pressure in this zone is common and not a red flag on its own.
Age Changes the Picture Slightly
The official guideline target of below 130/80 applies to all adults, but some researchers have proposed a more nuanced rule of thumb: optimal systolic pressure is roughly 100 plus half your age. Under that formula, a 40-year-old would aim for about 120, a 60-year-old for 130, and an 80-year-old for 140. By either standard, a systolic reading of 116 is excellent for most adults.
For older adults, though, achieving very low numbers can sometimes cause problems of its own, especially dizziness upon standing. If you feel fine at 116/66 with no lightheadedness, fatigue, or fainting spells, the reading is working in your favor.
When a Normal Reading Could Still Be Off
A single reading is just a snapshot. To trust that 116/66 truly reflects your resting blood pressure, the CDC recommends following a few steps when measuring at home:
- Avoid food, drinks, and caffeine for 30 minutes beforehand
- Empty your bladder first
- Sit with your back supported and feet flat on the floor for at least five minutes before measuring
- Keep the cuff on bare skin at chest height, with your arm resting on a table
- Don’t talk during the reading
- Take at least two readings one to two minutes apart and use the average
Rushing, crossing your legs, or placing the cuff over clothing can all skew results by 5 to 10 points in either direction. If you followed these basics, your 116/66 is reliable. If you didn’t, it’s worth retaking under proper conditions to confirm.
What to Do With a Good Reading
A normal blood pressure doesn’t mean you can ignore it going forward. Blood pressure tends to creep up with age, weight gain, high sodium intake, and reduced physical activity. Checking it a few times a year, even when it’s normal, helps you spot trends early. The jump from normal to elevated (120 to 129 systolic) can happen gradually, and catching it before it reaches stage 1 hypertension gives you the most options for managing it through lifestyle alone.
For now, 116/66 is a reading most people would be happy to see. It suggests your heart is pumping efficiently and your arteries aren’t under excessive strain.