A blood pressure of 111/66 is a good reading. It falls squarely in the “normal” category, which the American Heart Association defines as a systolic (top number) below 120 and a diastolic (bottom number) below 80. Both of your numbers sit comfortably within that range, well below the threshold for elevated blood pressure and well above the cutoff for low blood pressure.
Where 111/66 Falls on the Chart
Blood pressure is grouped into four categories for adults:
- 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 or higher systolic or 90 or higher diastolic
At 111/66, you’re not close to any of those higher categories. Your systolic number has 9 points of cushion before reaching “elevated,” and your diastolic number is 14 points below the hypertension threshold. This is the range where no lifestyle changes or treatments are recommended beyond maintaining the healthy habits you already have.
Is 66 Too Low for Diastolic?
Some people see a diastolic number in the 60s and wonder if it’s too low. Low blood pressure (hypotension) is formally defined as a reading below 90/60. Your diastolic of 66 is above that line, and your systolic of 111 is well above 90, so this reading doesn’t qualify as low blood pressure by any clinical standard.
That said, blood pressure numbers only tell part of the story. If you regularly feel lightheaded when standing up, unusually fatigued, or dizzy, those symptoms matter regardless of what the numbers say. A sudden drop of 20 points or more in systolic pressure (or 10 or more in diastolic pressure) when you go from sitting to standing is considered abnormal and worth mentioning to a healthcare provider. But if you feel fine at 111/66, there’s nothing to worry about.
What Your Pulse Pressure Tells You
Pulse pressure is the gap between your top and bottom numbers. For a reading of 111/66, that gap is 45. A normal pulse pressure is around 40, and yours is close to that mark. Providers start paying attention when pulse pressure climbs above 60 or drops below about one quarter of the systolic number (which for you would be roughly 28). At 45, your pulse pressure is healthy and suggests your blood vessels are maintaining normal elasticity.
These Categories Apply Across Age Groups
You might have seen charts online suggesting that blood pressure should naturally be higher as you get older. The AHA’s current guidelines use the same categories for all adults regardless of age or sex. A reading of 111/66 is considered normal whether you’re 25 or 65. Older adults are more likely to develop high blood pressure over time, but the goal remains the same: staying below 120/80.
During pregnancy, blood pressure is monitored more closely because of the risk of complications. High blood pressure in pregnancy is defined at a higher threshold of 140/90 or above on two separate readings. A reading of 111/66 during pregnancy is well within a healthy range.
Making Sure Your Reading Is Accurate
A single reading is a snapshot, not a diagnosis. To get the most reliable number, the CDC recommends a few specific steps. Avoid eating, drinking, or exercising for 30 minutes beforehand. Empty your bladder. Sit with your back supported and both feet flat on the floor for at least five minutes before measuring. Rest your arm on a surface at chest height, and place the cuff on bare skin rather than over a sleeve. Don’t talk during the reading.
Take at least two readings one to two minutes apart and average them. Blood pressure naturally fluctuates throughout the day, so tracking it over several days gives you a much clearer picture than any single measurement. If your readings consistently land near 111/66, you’re in excellent shape from a cardiovascular standpoint.