Blood Pressure Calculator

Yes. Under the 2017 ACC/AHA hypertension guideline, blood pressure of 130/80 mm Hg is classified as Stage 1 hypertension. This is a change from the previous threshold of 140/90, made because evidence shows cardiovascular risk rises significantly above 130/80.

The ACC/AHA categories are the same regardless of age. A blood pressure under 120/80 is normal whether you are 25 or 75. The 2017 guideline does not raise targets for older adults except in special cases — older adults with hypertension benefit from BP reduction to under 130/80 in most cases, per SPRINT trial evidence.

Stage 1 hypertension. The category is determined by whichever number is higher when they fall into different ranges. So 135/75 (Stage 1 systolic / normal diastolic) places you in Stage 1 by the ACC/AHA classification rules.

Hypertensive crisis is defined as systolic over 180 OR diastolic over 120. If you reach this level, wait 5 minutes and re-measure. If it's still that high — especially with chest pain, shortness of breath, severe headache, vision changes, weakness, or trouble speaking — call 911. Do not drive yourself.

Substantially. The DASH diet alone lowers systolic BP by an average 11 mm Hg in adults with hypertension. Combined with sodium restriction, weight loss (if overweight), aerobic exercise, and limited alcohol, lifestyle changes commonly produce 15–20 mm Hg reductions — comparable to a single antihypertensive medication.

Validated upper-arm cuffs from major brands (Omron, A&D, Welch Allyn) are within ±3 mm Hg of clinic readings when used correctly. Wrist and finger devices are less reliable. The AHA-recognized device validation registry is at validatebp.org. For the most accurate readings, sit quietly for 5 minutes, feet flat, back supported, arm at heart level.

White-coat hypertension affects 15–30% of adults. The clinical environment causes BP to rise temporarily, sometimes by 20+ mm Hg. The AHA recommends home monitoring (twice daily for 7 days) or 24-hour ambulatory monitoring before diagnosis to rule out white-coat effect — your insurance typically covers either.

Many adults with Stage 1 hypertension and no other cardiovascular risk factors can reach normal BP through lifestyle changes alone. Adults with Stage 2, established CVD, diabetes, kidney disease, or high ASCVD risk score typically need medication in addition. Always work with a clinician — do not stop existing prescriptions without guidance.