Blood Pressure Calculator
Enter your systolic and diastolic readings to see your AHA 2017 blood pressure category, pulse pressure, and mean arterial pressure instantly.
How to use this calculator
Move the systolic slider to your top number and the diastolic slider to your bottom number (both in mmHg). Your blood pressure category per the American Heart Association 2017 guidelines appears instantly, along with pulse pressure and mean arterial pressure. For the most accurate reading, measure in the morning before eating, after sitting quietly for 5 minutes, with your arm at heart level.
Understanding your blood pressure results
Blood pressure is expressed as systolic over diastolic (e.g., 120/80 mmHg). The AHA 2017 guidelines lowered the threshold for high blood pressure from 140/90 to 130/80, reflecting research showing cardiovascular risk rises continuously from 115/75 mmHg upward. This calculator also shows pulse pressure (arterial stiffness indicator) and mean arterial pressure (average perfusion pressure), both of which carry independent prognostic value.
Frequently asked questions
AHA 2017 blood pressure categories
The American Heart Association revised blood pressure categories in 2017. The table below shows systolic and diastolic thresholds for each category and the recommended course of action.
| Category | Systolic (mmHg) | Diastolic (mmHg) | Recommended Action | |
|---|---|---|---|---|
| Low (Hypotension) | < 90 | OR | < 60 | Consult a provider if symptomatic (dizziness, fainting) |
| Normal | < 120 | AND | < 80 | Maintain healthy lifestyle; check annually |
| Elevated | 120 – 129 | AND | < 80 | Lifestyle changes; recheck in 3–6 months |
| High BP — Stage 1 | 130 – 139 | OR | 80 – 89 | Lifestyle changes; consider medication; recheck in 1 month |
| High BP — Stage 2 | ≥ 140 | OR | ≥ 90 | Lifestyle + medication; recheck within 1 month |
| Hypertensive Crisis | > 180 | AND/OR | > 120 | Seek emergency care immediately |
What the numbers mean
A blood pressure reading has two numbers. The systolic pressure (top number) measures the force your heart exerts on artery walls with each beat. The diastolic pressure (bottom number) measures the pressure when your heart rests between beats. Both numbers matter: isolated systolic hypertension (high top, normal bottom) and isolated diastolic hypertension each carry independent cardiovascular risk. Pulse pressure (systolic minus diastolic) reflects arterial stiffness — a wide pulse pressure above 60 mmHg in older adults is associated with increased cardiovascular risk. Mean arterial pressure (MAP) represents the average pressure throughout the cardiac cycle; values between 70–100 mmHg are considered normal and reflect adequate organ perfusion.
Lifestyle changes to lower blood pressure
Clinical guidelines recommend these evidence-based lifestyle strategies before or alongside medication for most people with elevated or Stage 1 hypertension.
- ·Follow the DASH diet (Dietary Approaches to Stop Hypertension) — rich in fruits, vegetables, whole grains, and low-fat dairy; can lower systolic BP by 8–14 mmHg
- ·Reduce sodium intake to less than 1,500–2,300 mg per day — excess sodium causes fluid retention that raises blood pressure
- ·Exercise regularly — at least 150 minutes of moderate aerobic activity per week (walking, cycling, swimming) can lower BP by 5–8 mmHg
- ·Limit alcohol to no more than 1 drink/day (women) or 2 drinks/day (men) — heavy drinking is a significant and reversible cause of high BP
- ·Quit smoking — nicotine causes acute BP spikes and long-term arterial damage
- ·Lose excess weight — each kilogram of body weight lost can lower systolic BP by approximately 1 mmHg
- ·Manage stress through mindfulness, yoga, or relaxation techniques — chronic stress activates the sympathetic nervous system and raises BP
- ·Reduce caffeine intake if sensitive — caffeine can raise BP by 5–10 mmHg in some individuals
Risk factors for high blood pressure
Many risk factors for hypertension are modifiable. Understanding them helps target preventive efforts.
- ·Age — risk increases with age as arteries stiffen; more than half of adults over 60 have hypertension
- ·Family history — having a first-degree relative with hypertension roughly doubles your risk
- ·Excess body weight — adipose tissue increases vascular resistance and promotes hormonal changes that raise BP
- ·Physical inactivity — sedentary lifestyle is associated with higher resting heart rate and blood pressure
- ·High-sodium diet — excess salt drives fluid retention and increased vascular volume
- ·Excessive alcohol consumption — disrupts the renin-angiotensin system and increases vascular resistance
- ·Chronic stress — sustained activation of the sympathetic nervous system keeps BP elevated over time
- ·Underlying conditions — kidney disease, sleep apnea, thyroid disorders, and diabetes all independently raise blood pressure risk