A blood pressure of 109/73 is a good reading. It falls squarely within the normal range, which is defined as below 120/80 mmHg. Both your top number (systolic) and bottom number (diastolic) are comfortably within healthy limits, and well above the threshold for low blood pressure (90/60 mmHg).
Where 109/73 Falls on the Chart
The current classification system, updated in 2025 by the American Heart Association and American College of Cardiology, breaks adult blood pressure into four 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 or higher systolic, or 90 or higher diastolic
At 109/73, you’re in the normal category with room to spare. The only recommendation for people in this range is to maintain healthy habits.
What the Two Numbers Mean
The top number (109 in your case) is systolic pressure. It measures the force your blood exerts on artery walls each time your heart contracts and pushes blood out. The bottom number (73) is diastolic pressure, which reflects the pressure between beats when your heart is resting and refilling.
Both numbers matter, but systolic pressure becomes a more important predictor of heart disease risk after age 50. As people age, arteries stiffen and plaque accumulates, which tends to push that top number higher over time. A systolic reading near 109 suggests your arteries are handling blood flow well.
How 109/73 Compares for Long-Term Risk
Even within the “normal” range, lower tends to be better. A large study published in JAMA Cardiology found a stepwise increase in cardiovascular risk as systolic pressure climbed, with a 53% higher risk of heart disease for every 10-point increase in the top number. People with systolic readings of 110 to 119 had roughly three times the cardiovascular risk compared to those in the 90 to 99 range. That sounds alarming in isolation, but the absolute risk at these levels is still very low. It simply illustrates that blood pressure exists on a spectrum, and readings in the low-normal zone carry the least long-term risk.
Your reading of 109 sits at the lower end of that 110 to 119 bracket, which is a favorable place to be.
When Normal Becomes Too Low
Blood pressure below 90/60 mmHg is generally considered hypotension. At 109/73, you’re nowhere near that threshold. Low blood pressure only becomes a concern when it causes symptoms like dizziness, fainting, blurred vision, or fatigue. Some people naturally run on the lower side and feel perfectly fine. The key isn’t hitting a specific number but whether your organs are getting adequate blood flow without symptoms.
Why Your Reading Can Vary
Blood pressure isn’t static. It follows a natural daily rhythm, typically dipping during sleep and rising in the morning. On top of that pattern, several factors can push a reading up or down temporarily: stress, caffeine, a full bladder, recent exercise, or even the anxiety of being in a medical setting (sometimes called white coat hypertension). Smoking, poor sleep, and high salt intake can also shift your numbers.
A single reading is a snapshot. If you’re curious whether 109/73 reflects your true baseline, the American Heart Association recommends taking two readings at least one minute apart, twice a day (morning and evening), over at least three days and ideally a full week. That gives you a much more reliable picture than any single measurement.
How to Get an Accurate Reading at Home
Technique matters more than most people realize. Small mistakes can throw your numbers off by 10 points or more. Before measuring, sit quietly for at least five minutes with an empty bladder. Don’t talk or look at your phone during the reading.
When you’re ready, sit with your back supported and both feet flat on the floor. Don’t cross your legs. Rest the arm you’re measuring on a flat surface like a table so it’s roughly at heart level. Place the cuff on bare skin, not over clothing, and position it just above the bend of your elbow. Make sure the cuff size matches your arm circumference, since a too-small cuff can artificially inflate your reading. Take two measurements at least a minute apart and use the average.
Keeping Your Numbers Where They Are
At 109/73, you’re not trying to fix a problem. You’re protecting an advantage. The habits that maintain healthy blood pressure are familiar but worth reinforcing: regular physical activity, a diet rich in fruits, vegetables, and whole grains while moderate in sodium, maintaining a healthy weight, managing stress, and limiting alcohol. These aren’t just ways to prevent hypertension. They reduce cardiovascular risk through multiple pathways at once.
Your blood pressure will naturally trend upward with age as your arteries lose some of their elasticity. Starting from a healthy baseline like 109/73 gives you a meaningful buffer against that gradual rise.