Blood Pressure Category Checker

Calculator

How we calculate it

A blood pressure reading has two numbers: systolic, the peak pressure as the heart contracts, and diastolic, the lowest pressure as it relaxes between beats. This tool places a reading into a published category. The default is the 2025 AHA/ACC guideline, which replaced the 2017 edition in August 2025 and carried its category boundaries forward unchanged — so a chart drawn from the 2017 guideline still reads the same bands. Because categories differ meaningfully by region, the guideline is an explicit choice rather than a hidden default: a reading of 135/85 mmHg is Stage 1 hypertension under the AHA/ACC guideline but falls in the elevated range under the 2024 ESC guideline, which sets the hypertension threshold at 140/90. Both assign the higher of the two numbers’ categories, so 125/95 is categorized on the diastolic value. A reading at or above 180 systolic or 120 diastolic is flagged before any other band, because both guidelines treat that as needing prompt medical attention rather than routine follow-up. The tool categorizes a number against a published range; it does not diagnose hypertension, which requires repeated readings over time interpreted by a clinician.

Important limitations

• A single reading does not establish whether someone has high blood pressure. Both guidelines base a diagnosis on repeated readings on separate occasions, usually supported by home or 24-hour ambulatory monitoring.
• Blood pressure varies through the day and rises with talking, a full bladder, caffeine, nicotine, recent exercise, cold, pain and anxiety. White-coat elevation in clinic and masked elevation that only appears at home are both common.
• Technique changes the number. An unsupported arm, a cuff that is too small, crossed legs or measuring over clothing can each shift a reading by several mmHg.
• Home monitors vary in accuracy. A validated upper-arm device, checked against a clinic measurement, is more reliable than a wrist or finger monitor.
• Guideline categories are drawn for the general adult population. Targets often differ in pregnancy, in older adults, in chronic kidney disease and after a stroke.
• This tool categorizes a number. It cannot account for your history, your medications or your other results, and it does not diagnose hypertension.
• A category is not a treatment threshold. The 2025 AHA/ACC guideline decides when medication enters the conversation using an estimated 10-year cardiovascular risk from the PREVENT model, which needs a lipid panel, kidney function and a full history. This tool does not run PREVENT and cannot estimate your risk.