A blood pressure of 115/78 is a good reading. It falls squarely in the “Normal” category under the most recent 2025 guidelines from the American Heart Association and American College of Cardiology, which define normal blood pressure as below 120/80 mmHg. Both your top number (systolic, 115) and bottom number (diastolic, 78) sit comfortably within that range.
Where 115/78 Falls on the Scale
Current guidelines break adult blood pressure into four categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic and below 80 diastolic
- 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 115/78, both numbers land in the normal zone. If your two numbers ever fall into different categories, the higher category is the one that counts. In your case, both point to the same place: normal.
How Close You Are to the Next Category
Your systolic reading of 115 is just 5 points below the “Elevated” threshold of 120. Your diastolic reading of 78 is only 2 points below the cutoff for Stage 1 hypertension, which begins at 80. That diastolic number is worth keeping an eye on. A small upward shift of just 2 mmHg in that bottom number would technically move your classification from normal to Stage 1 hypertension, even if the top number stayed the same.
This doesn’t mean you’re at risk right now. Blood pressure naturally fluctuates throughout the day based on stress, caffeine, physical activity, and even the time you last ate. A single reading is a snapshot, not a diagnosis. But knowing how close your diastolic sits to 80 gives you a useful reference point for future checks.
What the Two Numbers Tell You
The top number (systolic) measures the pressure in your arteries when your heart beats. The bottom number (diastolic) measures the pressure between beats, when the heart is resting. Both matter independently for cardiovascular health.
The gap between them, called pulse pressure, also carries some health information. Your pulse pressure is 37 mmHg (115 minus 78). A typical pulse pressure is around 40 mmHg. Yours is slightly below that but not in a concerning range. A pulse pressure becomes potentially problematic when it’s very wide (well above 40) or very narrow (one-quarter or less of the systolic number, which for you would be about 29). At 37, you’re in a healthy zone.
Age and Sex Don’t Change This Target
You might expect that “good” blood pressure looks different depending on your age or whether you’re male or female. Older guidelines once had separate recommendations for people over 65. The current guidelines don’t. They use the same thresholds for all adults regardless of age or sex. Below 120/80 is normal whether you’re 25 or 75.
This approach came from large clinical trials that evaluated cardiovascular outcomes across all age groups without finding a reason to set different targets for older adults. So no matter your demographic, 115/78 counts as a healthy reading.
Making Sure Your Reading Is Accurate
A blood pressure reading is only as good as the conditions under which it’s taken. Small details can shift your numbers by 10 or even 20 points. The CDC recommends a specific checklist for getting a reliable measurement:
- Timing: Don’t eat, drink, or consume caffeine for 30 minutes beforehand. Empty your bladder first.
- Positioning: Sit in a chair with back support for at least 5 minutes before measuring. Keep both feet flat on the floor, legs uncrossed.
- Arm placement: Rest your arm on a table so the cuff sits at chest height. The cuff should go on bare skin, not over a sleeve.
- During the reading: Don’t talk while the measurement is being taken.
- Repetition: Take at least two readings, spaced 1 to 2 minutes apart, and use the average.
If your 115/78 was taken under rushed conditions, crossed legs, or right after coffee, your true resting blood pressure could be somewhat different. Following these steps gives you the most trustworthy number to track over time.
Keeping It in the Normal Range
Having normal blood pressure now doesn’t guarantee it stays that way. Blood pressure tends to creep upward with age, weight gain, increased sodium intake, reduced physical activity, and chronic stress. The habits that keep blood pressure low are the same ones you’ve heard for general heart health: regular movement, a diet rich in fruits, vegetables, and whole grains, moderate sodium intake, limited alcohol, and consistent sleep.
Checking your blood pressure at home every few months gives you a personal trend line that’s more useful than any single office visit. If you notice your diastolic consistently hitting 80 or above, or your systolic climbing past 120, that’s a signal your body’s baseline is shifting. Catching that trend early, while you’re still in or near the normal range, gives you the most room to adjust through lifestyle changes alone.