Health Risk

Blood Pressure Calculator

Q: Should I measure BP at home?

Yes. Home monitoring with a validated upper-arm cuff is more accurate than occasional office readings. Take morning and evening readings for a week before your appointment.

Q: Can I lower BP with diet alone?

Often yes. The DASH diet, sodium under 1,500 mg/day, 4,700 mg/day of potassium from food, and moderate alcohol can lower systolic BP by 10–15 mmHg in 8 weeks.

Q: What is pulse pressure?

Pulse pressure is systolic minus diastolic. A wide pulse pressure (>60 mmHg) signals arterial stiffening and predicts cardiovascular events, especially in older adults.

Enter your systolic and diastolic readings to see your category according to the 2017 ACC/AHA guidelines. Includes pulse pressure and MAP for clinical context.

How blood pressure is classified

The 2017 ACC/AHA guidelines lowered the threshold for hypertension to 130/80 mmHg, replacing the older 140/90 cutoff. The change was driven by the SPRINT trial, which showed that targeting systolic BP below 120 mmHg in high-risk patients reduced cardiovascular events and death by about 25%. The new categories. Normal, Elevated, Stage 1, Stage 2, and Crisis, are designed to flag risk earlier, when lifestyle changes can still reverse the trend.

Why your reading varies from minute to minute

Blood pressure is a dynamic signal. It rises with stress, caffeine, a full bladder, talking, cold temperatures, and recent exercise. It falls with rest, slow breathing, and sleep. A single elevated office reading does not diagnose hypertension, guidelines require the average of two or more readings on two or more visits. Home monitoring with a validated upper-arm cuff, taken morning and evening for a week, gives a far more accurate picture than any single clinic measurement.

Pulse pressure and MAP, the hidden signals

Pulse pressure (systolic minus diastolic) reflects arterial stiffness. A wide pulse pressure (above 60 mmHg) is common in older adults and signals reduced vessel elasticity, an independent predictor of cardiovascular events. Mean Arterial Pressure (MAP) is the average pressure during a cardiac cycle, estimated as diastolic plus one-third of pulse pressure. MAP is the value clinicians use to assess organ perfusion, and is the target in critical care settings (typically kept 65-110 mmHg).

The DASH diet, proven to lower BP

The Dietary Approaches to Stop Hypertension (DASH) trial showed that a diet rich in fruits, vegetables, whole grains, low-fat dairy, and lean protein, and low in saturated fat, sodium, and added sugar, lowered systolic BP by 8-14 mmHg in 8 weeks. Adding sodium restriction (below 1,500 mg/day) doubles the effect. Aiming for 4,700 mg/day of potassium from food (bananas, potatoes, beans, yogurt) adds another 4-8 mmHg reduction. Combined, these dietary changes rival the effect of a single BP medication.

Editorial and formula review

Researched by Macrition Research Team Formulas verified against published peer-reviewed sources Last verified 2026-08

Formula sources, population limits, and references for this health risk calculator are documented in our public methodology. Read the methodology · Medical disclaimer

Frequently asked questions

Below 120/80 mmHg is normal. 120-129/<80 is elevated. 130-139/80-89 is Stage 1 hypertension. ≥140/90 is Stage 2. ≥180/120 is a hypertensive crisis.

Yes. Home monitoring with a validated upper-arm cuff is more accurate than occasional office readings. Take morning and evening readings for a week before your appointment.

Often yes. The DASH diet, sodium under 1,500 mg/day, 4,700 mg/day of potassium from food, and moderate alcohol can lower systolic BP by 10-15 mmHg in 8 weeks.