A blood pressure of 118/70 is a good reading. It falls squarely in the “normal” category, which is defined as a systolic (top number) below 120 and a diastolic (bottom number) below 80. In fact, 118/70 sits near the upper edge of normal without crossing into the “elevated” range, which starts at 120.
What the Two Numbers Mean
The top number, 118, measures the pressure in your arteries each time your heart beats and pushes blood out. The bottom number, 70, measures the pressure between beats, when your heart is resting. Both numbers matter, and both of yours are in a healthy range.
A diastolic reading of 70 is comfortably below the 80 threshold where concern begins. And a systolic reading of 118 gives you a small cushion before reaching 120, where blood pressure is reclassified as “elevated” even if the bottom number stays normal.
How Blood Pressure Categories Work
Current guidelines from the American Heart Association break blood pressure into five 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
- Severe hypertension: above 180 systolic and/or above 120 diastolic
Your reading of 118/70 meets both criteria for normal. These categories apply to adults regardless of age or sex. There is no separate “normal by age” chart in current clinical guidelines.
Why Staying Below 120 Matters
A major clinical trial called SPRINT tested whether keeping systolic pressure below 120 offered real health benefits compared to a more relaxed target of 140. The results were striking: the lower target reduced heart attacks, heart failure, and strokes by 25% and lowered the overall risk of death by 27%. Those benefits held across age groups, sexes, and races. There was also a roughly 20% reduction in mild cognitive impairment among participants treated to the lower target.
At 118/70, you’re already in that protective zone without needing medication to get there. That’s a meaningful advantage for long-term heart and brain health.
One Reading vs. a Pattern
A single blood pressure reading is a snapshot, not a diagnosis. Blood pressure naturally fluctuates throughout the day based on stress, caffeine, physical activity, hydration, and even whether you recently used the bathroom. If you got this reading at a pharmacy kiosk or during a single check, it’s encouraging but not the full picture.
For a more reliable assessment, the American Heart Association recommends taking two readings at least one minute apart, both morning and evening, for at least three days (ideally seven). That gives you a minimum of 12 readings to average, which paints a much more accurate picture than any single measurement. Before each reading, empty your bladder, sit quietly for five minutes with your back supported, feet flat on the floor, legs uncrossed, and the cuffed arm resting on a flat surface at heart level. Don’t talk or check your phone during the measurement.
Cuff size matters too. The cuff should wrap around your bare upper arm, not over clothing, with the bottom edge sitting just above the inside of your elbow. An incorrectly sized cuff can skew readings by 10 points or more.
Could 118/70 Ever Be Too Low?
For the vast majority of people, no. Blood pressure is generally considered too low only when it causes symptoms like dizziness, fainting, blurred vision, fatigue, or trouble concentrating. A sudden drop of just 20 points in systolic pressure (say, from 110 down to 90) can trigger those symptoms, but a stable resting reading of 118/70 is not in hypotension territory.
If you consistently feel lightheaded when standing up quickly, that could point to a separate issue called orthostatic hypotension, which relates to how your body adjusts pressure with position changes rather than your baseline reading being too low.
Keeping Your Numbers Where They Are
Normal blood pressure doesn’t stay normal automatically. It tends to creep upward with age, weight gain, increased sodium intake, and reduced physical activity. The habits that help most are the same ones you’ve likely heard before, but the specifics matter. Keeping sodium intake below 1,500 milligrams per day produces a measurable drop in blood pressure beyond what the standard 2,300-milligram limit achieves. Regular aerobic exercise, maintaining a healthy weight, limiting alcohol, and eating a diet rich in fruits, vegetables, whole grains, and lean protein all contribute to keeping your numbers stable over time.
At 118/70, there’s nothing to fix. The goal is simply to maintain the patterns that got you here.