A blood pressure of 117/78 is a good reading. It falls squarely within the normal category, which is defined as a systolic (top number) below 120 and a diastolic (bottom number) below 80. By current American Heart Association and American College of Cardiology guidelines, this is the ideal range.
Where 117/78 Falls on the Scale
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 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 117/78, both numbers sit comfortably in the normal range. If your two numbers ever land in different categories, the higher category is the one that counts. In your case, both point to the same place: normal.
What Each Number Tells You
The top number (117) measures the pressure in your arteries when your heart beats. The bottom number (78) measures the pressure between beats, when your heart is resting. Both matter, but research consistently shows that the top number is the strongest predictor of future heart attack, stroke, and cardiovascular death, regardless of age.
That said, the bottom number carries extra weight if you’re under 50. A large study found that diastolic readings provided meaningful additional information about cardiovascular risk in younger adults. So for younger people especially, having both numbers in range, as 117/78 is, offers reassurance on two fronts.
The Health Advantage of Staying Below 120/80
Being in the normal range isn’t just a label. It translates to measurable protection. A landmark trial published in The New England Journal of Medicine found that people who kept their blood pressure around 120/80 had a 25% lower risk of heart attack, stroke, or cardiovascular death compared to those who aimed for the older, more relaxed target of below 140/90. They also had 27% fewer deaths from any cause over the three-year study period.
A reading of 117/78 puts you right in that protective zone. Nearly half of U.S. adults have high blood pressure, so being in the normal category is a genuinely favorable position.
One Reading Isn’t the Full Picture
Blood pressure fluctuates throughout the day based on stress, activity, caffeine, and dozens of other factors. A single reading of 117/78 is encouraging, but it’s a snapshot. Clinical guidelines recommend basing any blood pressure assessment on the average of at least two readings taken on at least two separate occasions.
The conditions under which you measure also matter more than most people realize. The CDC recommends the following for an accurate reading:
- Avoid food, drinks, and caffeine for 30 minutes beforehand
- Empty your bladder first
- Sit with your back supported for at least 5 minutes before measuring
- Keep both feet flat on the floor with legs uncrossed
- Rest your arm on a surface at chest height
- Place the cuff on bare skin, not over clothing
- Stay silent during the reading
- Take at least two readings, spaced 1 to 2 minutes apart
If your 117/78 came from a rushed reading at a pharmacy kiosk while you were still carrying grocery bags, it may not reflect your true baseline. If it came from a calm, properly positioned reading at home, you can put more confidence in it.
Does Age Change the Target?
The official AHA/ACC guidelines apply the same blood pressure categories to adults of all ages, from 30-year-olds to people in their 80s. In practice, though, older adults with stiff arteries sometimes struggle to get their systolic number below 140 without experiencing dizziness or mental fogginess. For them, the ideal target may need to be adjusted in conversation with their care team.
If you’re a younger or middle-aged adult reading 117/78, you’re in an excellent position. Maintaining that level over time is one of the most effective things you can do for long-term cardiovascular health.
Keeping Your Numbers in This Range
Even with a normal reading, the habits that protect blood pressure are worth knowing, because blood pressure tends to creep upward with age. Reducing salt intake is one of the most well-studied interventions. A WHO-backed meta-analysis found that a modest, sustained reduction in dietary salt lowers systolic pressure by about 4 points and diastolic pressure by about 2 points on average. For people who already have high blood pressure, the effect is even larger: roughly 5 points off the top number.
Other factors with strong evidence include regular physical activity, maintaining a healthy weight, limiting alcohol, managing stress, and eating a balanced diet rich in fruits, vegetables, and whole grains. None of this is urgent at 117/78, but these are the habits that keep normal readings normal as the years go on.